Rock and Mineral Test Practice

• Andesite• Medium Color – small crystals• Andesitic, extrusive, igneous

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Coal Low specific gravity – no holesOrganic Sedimentary

ConglomerateMade of large sedimentsDetrital, sedimentary

CoquinaMade of shell fragmentsOrganic, sedimentary

DioriteMedium Color - large crystalsAndesitic, intrusive, igneous

GabbroDark color – large crystalsBasaltic, intrusive, igneous

GalenaMetallic luster – high specific gravityMineral

GneissLayered – granularFoliated metamorphic

Granite Light-colored, large crystalsGranitic, intrusive, igneous

HematiteRed color, dull lusterMineral

PumiceGas pockets – light-coloredExtrusive, granitic, igneous

Quartzite No layers– granularNonfoliated metamorphic rock

Red SlateLayered – red color Foliated metamorphic

SandstoneMedium sediment sizeDetrital sedimentary

SchistLayered – flakyFoliated metamorphic

Scoria Gas pockets – dark colorBasaltic, extrusive, igneous

ShaleSmall sediment sizeDetrital Sedimentary

Biotite MicaBlack color – perfect cleavageMineral

Rhyolite

• Small crystals. Light colored• Extrusive, granitic, igneous