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170 results were found
specimens
Description:
High grade metamorphosed rock showing bands of quartz, feldspar, and biotite.
Description:
Light gray, with flow structure.
Description:
Grayish black trap rock.
Description:
Dark gray, composed mostly of pyroxene and olivine.
Description:
Gray with line crinoid columnal fragments.
Description:
Hematite-cemented quartz; orthoquartzite.
Description:
Coarse crystalline, carbonate.
Description:
Classic, dark; from the Columbia Plateau.
Description:
Medium-grained with biotite.
Description:
Gray to buff, with numerous ooliths and fossil fragments.
Description:
Red, medium, to coarse-grained iron oxide cement; shows hematite bands.
Description:
Abundant small black phenocrysts in a gray to brown matrix.
Description:
Light grayish green, fine-grained, well-foliated, schistose.
Description:
Black, fissile; commonly with carbonized fossil plant impressions.
Description:
Well-cemented, medium-grained orthoquartzite.
Description:
Lustrous, black 'hard coal'.
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Stock for this item is limited, but may be available in a warehouse close to you. Please make sure that you are logged in to the site so that available stock can be displayed. If the is still displayed and you need assistance, please call us at 1-800-962-2660.
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