Wards1-100
Wards1-100(contued)
Wards101-130 Wards131-160
Wards131-160(continued)
Wards161-190 Wards191-200
Wards
Collection
1-100
(Continued)
Wards1-100
Wards1-100(contued)
Wards101-130 Wards131-160
Wards131-160(continued)
Wards161-190 Wards191-200
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Encrinal Limestone Location: Lockport, NY Description: a sedimentary rock dominated mineralogically by calcite. Encrinal refers to a limestone containing 10-50% fossil crinoidal fragments.
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Micaceous Sandstone Location: Portland, CT Description: a well cemented sedimentary rock consisting predominantly of quarts. Micaceous refers to the abundance of micas (biotite, muscovite, chlorite). |
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Augite Gabbro Location: Pala, CA Description: are basic intrusive rocks composed principally of calcic plagioclase and pyroxene, with or without olivine. In most gabbros plagioclase predominate over pyroxene. Gabbro is the coarse-grained, plutonic equivalent of basalt and dolerite. |
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Diabase Location: Somerville, MA Description: an intrusive rock commonly occurring as dikes in sills whose main constituents are laborite and pyroxene and whose texture is characteristically ophitic or subophitic. This usage is synonymous with dolerite. NOTE: originally applied by A. Brongniart in 1807 for rocks later recognized as diorite. |
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Diorite Prophyry Location: Jackson, Washington, CO, WY Description: are holocrystalline coarse- to medium grained intermediate plutonic igneous rocks composed of plagioclase and mafic constituents (often hornblende, but also biotite or augite). |
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Quartz Diorite Porphyry Location: N/A Description: are holocrystalline coarse- to medium grained intermediate plutonic igneous rocks composed of plagioclase and mafic constituents (often hornblende, but also biotite or augite). With increasing amounts of quartz (5-20%) the rock becomes quartz diorite. |
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Quartz Monzonite Porphyry Location: Pershing, CO Description: are uncommon intermediate intrusive igneous rocks with quatrz <5% and alkali feldspar: plagioclase between 35 and 65%. |
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Hornblende Gabbro Location: Salem Neck, MA Description: are basic intrusive rocks composed principally of calcic plagioclase and pyroxene, with or without olivine. In most gabbros plagioclase predominate over pyroxene. Gabbro is the coarse-grained, plutonic equivalent of basalt and dolerite. |
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Vesicular Basalt Location: Chaffee County, CO Description: are fine-grained, mafic, volcanic rocks containing 44-53 wt% SiO2. They consist essentially of calcic plagioclase and abundant mafic minerals, mainly Ca-rich clinopyroxene. Abundance of vesicles are present which are spherical or elongate because of compaction or flow. |
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Dacite Location: West Moreland, England Description: is a volcanic rock which usually contains phenocrysts of plagioclase, less clacic than andesine, quartz, subordinate ferromagnesian mineral(s) in a fine-grained ground mass. The coarse-grained equivalent is granodiorite. |
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Quartz Monzonite Porphyry Location: N/A Description: are uncommon intermediate intrusive igneous rocks with quartz <5% and alkali feldspar: plagioclase between 35 and 65%. |
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Gabbro Porphyry Location: N/A Description: are basic intrusive rocks composed principally of calcic plagioclase and pyroxene, with or without olivine. In most gabbros plagioclase predominate over pyroxene. Gabbro is the coarse-grained, plutonic equivalent of basalt and dolerite. |
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Amygdaloidal Basalt Location: Kenweenaw, Michigan Description: are fine-grained, mafic, volcanic rocks containing 44-53 wt% SiO2. They consist essentially of calcic plagioclase and abundant mafic minerals, mainly Ca-rich clinopyroxene. Abundance of vesicles are present which are spherical or elongate because of compaction or flow. Amygdaloidal is a textural term describing volcanic rocks containing mineral-filled, eliptically shaped vesicles. |
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Andesite Breccia Location: Curay, Colorado Description: a volcanic rock with essential andesine in the ground mass and one or more ferromagnesian minerals, commonly pyroxene(s) or horneblende +/- biotite. The rock type is commonly porphoritic and the feldspar phenocrysts may be complexly zoned and embayed with the composition of the cores of the crystals as calcic as bytownite. The equivilant coarse-grained rock is diorite. Breccia refers to a sedimentary rock composed of angular clasts larger than 2 mm in diameter in a sandy or gravelly matrix. |
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Granodiorite Location: N/A Description: is a medium- to light-colored coarse-grained rock containing essential quartz, plagioclase feldspar, and alkali feldspar, in amounts between 10 and 35% of the total feldspar, and lesser amounts of mafic minerals, commonly hornblende or biotite, or both.
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Olivine Gabbro Location: Wichita Mts., Oklahoma Description: are basic intrusive rocks composed principally of calcic plagioclase and pyroxene, with olivine. In most gabbros plagioclase predominate over pyroxene. Gabbro is the coarse-grained, plutonic equivalent of basalt and dolerite.
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Basalt Porphyry Location: State bridge, Colorado Description: are fine-grained, mafic, volcanic rocks containing 44-53 wt% SiO2. They consist essentially of calcic plagioclase and abundant mafic minerals, mainly Ca-rich clinopyroxene. Abundance of vesicles are present which are spherical or elongate because of compaction or flow.
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Andesite Location: Mt. Shasta, California Description: a volcanic rock with essential andesine in the ground mass and one or more ferromagnesian minerals, commonly pyroxene(s) or horneblende +/- biotite. The rock type is commonly porphoritic and the feldspar phenocrysts may be complexly zoned and embayed with the composition of the cores of the crystals as calcic as bytownite. The equivilant coarse-grained rock is diorite.
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Latite Location: Silverton, Colorado Description: is a porphyritic effusive rock composed of phenocrysts of plagioclase in K-feldspars (sometimes sanidine) in nearly equal proportions, little or no quartz, and a finely crystalline or glassy groundmass. Clinopyroxene in the most common pheromagnesian mineral, but orthopyroxene, olivine and, less commonly, hornblende may occur, while biotite is commonly present.
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Dunite Location: Jackson Country, North Carolina Description: is the name used for an ultramafic rock which consists almost entirely of olivine, often accompanied by accessory chrome spinel.
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Olivine Gabbro Porphyry Location: Description: are basic intrusive rocks composed principally of calcic plagioclase and pyroxene, with olivine. In most gabbros plagioclase predominate over pyroxene. Gabbro is the coarse-grained, plutonic equivalent of basalt and dolerite.
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Basalt Location: Somerset County, New Jersey Description: are fine-grained, mafic, volcanic rocks containing 44-53 wt% SiO2. They consist essentially of calcic plagioclase and abundant mafic minerals, mainly Ca-rich clinopyroxene. Abundance of vesicles are present which are spherical or elongate because of compaction or flow.
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Andesite Porphyry Location: Boulder County, Colorado Description: a volcanic rock with essential andesine in the ground mass and one or more ferromagnesian minerals, commonly pyroxene(s) or horneblende +/- biotite. The rock type is commonly porphoritic and the feldspar phenocrysts may be complexly zoned and embayed with the composition of the cores of the crystals as calcic as bytownite. The equivilant coarse-grained rock is diorite.
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Latite Porphyry Location: Silverton, Colorado Description: is a porphyritic effusive rock composed of phenocrysts of plagioclase in K-feldspars (sometimes sanidine) in nearly equal proportions, little or no quartz, and a finely crystalline or glassy groundmass. Clinopyroxene in the most common pheromagnesian mineral, but orthopyroxene, olivine and, less commonly, hornblende may occur, while biotite is commonly present.
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Kimberlite Location: South Africa Description: was originally described by Lewis in 1887 as a serpentinized, ultrabasic, phlogopite-bearing, diamondiferous volcanic breccia found at the Kimberley Diamond mines, South Africa. Since the original description, Kimberlite has been extended to nonbrecciated rocks of similar mineralogy to that from the type locality but lacking diamond.
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Hypersthene Gabbro Location: N/A Description: are basic intrusive rocks composed principally of calcic plagioclase and pyroxene, with or without olivine. In most gabbros plagioclase predominate over pyroxene. Gabbro is the coarse-grained, plutonic equivalent of basalt and dolerite.
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Diorite Location: Salem, Massachusetts Description: a coarse-grained, medium-colored rock consisting of andesine plagioclase and one or more of the mafic minerals clino- and ortho-pyroxene, hornblende biotite. A little quartz K-feldspar may be present. Olivine is a minor constituent of some diorites. This is the coarse-grained equivalent of andesite.
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Mica Dacite Porphyry Location: Sunshine County, Colorado Description: is a volcanic rock which usually contains phenocrysts of plagioclase, less clacic than andesine, quartz, subordinate ferromagnesian mineral(s) in a fine-grained ground mass. The coarse-grained equivalent is granodiorite.
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Pink Marble Location: Tate, Georgia Description: a crystalline metamorphic rock composed of calcite, dolomite, and minor quartz.
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Quartz-Sericite Schist Location: Montgomery County, Penn. Description: a phaneritic, foliated metamorphic rock with an abundant phyllosilicate or acicular minerals.
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Boitite Gneiss Location: Uxbridge, Massachusetts Description: a phaneritic, foliated metamorphic rock characterized by alternating bands of contrasting mineralogical composition.
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Calcareous Tufa Location: Mumford, New York Description: "tufa - cellular ; layered carbonate rocks with holes, formed by springwater."
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Dolomitic Marble Location: Thornwood, New York Description: crystalline metamorphic rock composed of calcite, dolomite, and minor quartz.
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Red Slate Location: Granville, New York Description: is a fine-grained, pelitic rock characterized by a penatrative planar parting (slaty cleavage) resulting from the almost perfect allignment of phyllosilicates such as muscovite and chlorite.
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Sillimate-Garnet Gneiss Location: Near Hague Warren City, New York Description: the most common use for the term "gneiss" is for a medium coarse-grained, generally equigrainual, metamorphic rock, with a poorly defined planar anisotrophy or gneissosity indicated by altering felsic and mafic layers.
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Dolomitic Limestone Location: Rochester, NY Description: a sedimentary rock dominated mineralogically by calcite
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Verd Antique Location: Roxbury, Vermont Description:
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Gray Slate Location: Near Bangor, Penn. Description: is a fine-grained, pelitic rock characterized by a penatrative planar parting (slaty cleavage) resulting from the almost perfect allignment of phyllosilicates such as muscovite and chlorite.
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Chlorite Schist Location: Chester, Vermont Description: a phaneritic, foliated metamorphic rock with an abundant phyllosilicate or acicular minerals. Predominate mineral is chlorite.
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Hornblende Gneiss Location: Clintonville, New York Description: phaneritic, foliated metamorphic rock characterized by alternating bands of contrasting mineralogical composition. Main mafic mineral is hornblende.
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Serpentine Location: Cardiff, Mayland Description: mineral produced by metamorphism of the magnesium-rich minerals of ultramafic or mafic rocks.
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Meta-Quartzite Location: Ableman, Wisconsin Description: a quartzite whose formation is due to metamorphic recrystallization. |
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Talc-Schist (Tremolitic) Location: St. Lawrence County, New York Description: a phaneritic, foliated metamorphic rock with an abundant phyllosilicate or acicular minerals. Predominate mineral is talc.
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Oolitic Iron Ore Location: Clinton, New York Description:
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Soapstone Location: Alodrene, VA Description: soft calcareous limestone.
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Quartzite Location: Dell Rapids, SD Description: metamorphic rock composed of firmly cemented quartz grains. It results from the metamorphism of pure quartz sandstone.
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Tourmaline-Mica Schist Location: Near Custer, SD Description: a phaneritic, foliated metamorphic rock with an abundant phyllosilicate or acicular minerals.
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Mica Schist Location: Manhattan Island, NY Description: a phaneritic, foliated metamorphic rock with an abundant phyllosilicate or acicular minerals.
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Siliceuos Oolite Location: State College, Penn. Description: a rock composed of mostly ooids.
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Cordierite Hornfels Location: Montana Description: fine-grained, usualy dar-shaded rock with diablastic or granoblastic texture; produced by contact metamorphism.
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White Marble Location: West Ruthland, Vermont Description: crystalline metamorphic rock composed of calcite, dolomite, and minor quartz.
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Tourmaline-Mica Schist Location: Near Custer, SD Description: a phaneritic, foliated metamorphic rock with an abundant phyllosilicate or acicular minerals.
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Garnet Schist Location: N/A Description: Schist with large garnets and abundant amount of muscovite and chlorite.
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