Looking After Your Finds - Reference
Identifying Minerals
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Identifying Minerals
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Metamorphic
If the original rock type can be recognized, the rock can be described by prefixing meta- to it: metaconglomerate, metarhyolite, metabasalt, etc. Often this is the only way of naming the rock.
Fine platy texture but no visible grains: slate
Fine platy texture with a visible sheen: phyllite
Coarse platy texture, visible mica and other minerals: schist
Obvious bands and streaks of minerals: gneiss
Dark greenish or bluish, massive or weakly foliated: greenstone
Made mostly of amphibole, usually aligned: amphibolite
Massive and made mostly of quartz: quartzite
Massive and made mostly of calcite or dolomite: marble
If the original rock type can be recognized, the rock can be described by prefixing meta- to it: metaconglomerate, metarhyolite, metabasalt, etc. Often this is the only way of naming the rock.
Fine platy texture but no visible grains: slate
Fine platy texture with a visible sheen: phyllite
Coarse platy texture, visible mica and other minerals: schist
Obvious bands and streaks of minerals: gneiss
Dark greenish or bluish, massive or weakly foliated: greenstone
Made mostly of amphibole, usually aligned: amphibolite
Massive and made mostly of quartz: quartzite
Massive and made mostly of calcite or dolomite: marble
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