"WardsSci000451"
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Ward's Science Essentials® Quartzite
Quartzite is hard, non-foliated rock formed from metamorphosed quartz sandstones.
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Ward's Science Essentials® Gray Gneiss
High grade metamorphosed rock showing bands of quartz, feldspar, and biotite.
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Ward's® Serpentinite
Dark-green 'verde antique', containing some chlorite and calcite.
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