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PYROXENE #3
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To sample #1 Return to B.R.S. A ferro-magnesian mineral. Dark green to black, although weathered specimens may look faded. Dull luster; blocky appearance; 90 degree cleavage (which can be seen in the view in this specimen, although it is typically hard to find or see.   This is a common mineral in mafic igneous rocks usually mixed with Ca Plagioclase. |