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Rock and Mineral Test Practice. Andesite Medium Color – small crystals Andesitic, extrusive, igneous. 2. Coal Low specific gravity – no holes Organic Sedimentary. Conglomerate Made of large sediments Detrital, sedimentary. Coquina Made of shell fragments Organic, sedimentary.
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Andesite • Medium Color – small crystals • Andesitic, extrusive, igneous
2 Coal Low specific gravity – no holes Organic Sedimentary
Conglomerate Made of large sediments Detrital, sedimentary
Coquina Made of shell fragments Organic, sedimentary
Diorite Medium Color - large crystals Andesitic, intrusive, igneous
Gabbro Dark color – large crystals Basaltic, intrusive, igneous
Galena Metallic luster – high specific gravity Mineral
Gneiss Layered – granular Foliated metamorphic
Granite Light-colored, large crystals Granitic, intrusive, igneous
Hematite Red color, dull luster Mineral
Pumice Gas pockets – light-colored Extrusive, granitic, igneous
Quartzite No layers– granular Nonfoliated metamorphic rock
Red Slate Layered – red color Foliated metamorphic
Sandstone Medium sediment size Detrital sedimentary
Schist Layered – flaky Foliated metamorphic
Scoria Gas pockets – dark color Basaltic, extrusive, igneous
Shale Small sediment size Detrital Sedimentary
Biotite Mica Black color – perfect cleavage Mineral