15 Rocks Lab Exam 1
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15 Terms
Dark black, no visible crystals, igneous
Basalt
Dark colored, large crystals visible, igneous
Gabbro
Light colored, large crystals visible, igneous
Granite
Light/pink, fine-grained, very light density, igneous
Rhyolite
Volcanic glass, conchoidal fracture, igneous
Obsidian
Feels like sandpaper, sand grains visible, rust color from iron oxide, sedimentary
Sandstone (iron oxide cement)
Effervesces in acid (calcite), biochemical, sedimentary
Limestone
Fissile (breaks into thin sheets), small grains visible, sedimentary
Shale
Visible gravel-sized grains, sedimentary
Conglomerate
Made of shells cemented together, sedimentary
Coquina
Strong foliation, alternating light/dark bands, metamorphic
Gneiss
Scratches glass, non-foliated, parent rock sandstone, metamorphic
Quartzite
Effervesces in acid, non-foliated, parent rock limestone, metamorphic
Marble
Glittery appearance (mica crystals visible), metamorphic
Schist
Slaty cleavage, breaks into thin sheets, smooth, metamorphic
Slate
Note 
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