Geology mineral test study guide

question

galena
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silvery gray cubic crystal, hardness of 2.5, dark gray streak color, metallic luster, 3 planes of perpendicular cleavage, mineral
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halite
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perfect 3 direction cleavage, salty taste, almost any color, white streak color, hardness of 2.5, nonmetallic luster, mineral
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quartz
quartz
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conchoidal fracture, almost any color, no cleavage, white streak color, hardness of 7, nonmetallic luster, mineral
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Muscovite
Muscovite
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clearish green color, one perfect plane of cleavage, white streak color, hardness of 1, nonmetallic luster, mineral
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biotite
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splits into sheets, greenish black color, one perfect direction of cleavage, gray to gray brown streak, hardness of one, nonmetallic luster, mineral
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sulfur
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poor cleavage, has odor, bright yellow color, hollow, feels silky, pale streak color, hardness of 1.5, nonmetallic luster, mineral
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granite
granite
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felsic igneous rock, intrusive, contains feldspar, quartz, and biotite, phanertitic texture
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andesite porphyry
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intermediate composition, extrusive igneous rock, porphyritic texture
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obsidian
obsidian
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glassy texture and look, extrusive igneous rock, dark color common, felsic, can have snowflakes
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pumice
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felsic, extrusive igneous rock, vesicular texture, floats in water
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tuff
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pyroclastic texture, felsic to mafic, extrusive igneous rock
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coquina
coquina
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composed of cemented shell fragments. little or no matrix-/cement visible, reacts with HCL, contains calcite, bioclastic texture, biochemical sedimentary rock
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conglomerate
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grains within rock are rounded, gravel sized particles, pebbles in rock, color and size varies, detrital sedimentary rock
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breccias
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fragment grains within rock are angular and different sizes, gravel sized particles, detrital sedimentary rock
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oolitic limestone
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reacts with HCL, gritty texture, commonly light colored, small layered spheres are characteristic, composed of calcite, chemical sedimentary rock
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gneiss
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medium to coarse grained, light and dark banded layers, foliated metamorphic rock, parent rock granite, regional metamorphism
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mica schist
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fine to medium grained, crystals visible, foliated metamorphic rock, sometimes has garnets, regional metamorphism
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garnet mica schist
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contains crystals, dominated by mica, sparkly, parent rock shale?) foliated metamorphic rock, regional metamorphism
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quartzite
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non-foliated metamorphic rock, almost any color, medium to coarse grained, usually light colored, parent rock quartz sandstone, one of the strongest metamorphic rocks
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calcite
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almost any color, perfect 3 plane cleavage not at 90 degrees, effervesces with dilute HCL, hardness of 3, white streak color, non metallic luster,. mineral
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marble
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medium to coarse grained, generally light colored, reacts with dilute HCL, parent rock, limestone or dolostone, non-foliated metamorphic rock, contact metamorphism

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