| Aphanitic Sedimentary
Rocks (Fine-Grained)
Classification Chart |
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| MINERAL | ROCK NAME | |||
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C
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GLASS (H>5.5) |
-
CLAY with QUARTZ, FELDSPAR, Mica - |
CLAYSTONE (not laminated)
SHALE (laminated) |
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| QUARTZ (Silica) | -
CHERT - |
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SCRATCH GLASS (H<5.5) |
-
CLAY Minerals, variable color, SMELLS MUSTY - |
CLAYSTONE (not laminated)
SHALE (laminated) |
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| CALCITE, variable color, H=3,
REACTS VIGOROUSLY with HCl (effervesces) |
FINE-GRAINED LIMESTONE,
grainy appearance
MICRITE, extremely fine texture, smooth CHALK, soft and powdery |
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| DOLOMITE, variable color, H=3,
REACTS with HCl, but RELUCTANTLY (may react only in powder form) |
FINE-GRAINED DOLOSTONE,
grainy appearance |
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| GYPSUM, WHITE but sometimes stained by hematite, H=2, NO reaction with HCl | EVAPORITE | |||
| CARBON (black) | COAL
Anthracitic, glassy luster Bituminous, earthy luster |
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