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Specimen dimensions: 4x3x2 inches (105x85x42mm)
Specimen weight: 21¾ ounces (620 grams)
Collection: Round Rock Campus
For reference: the U.S. penny is 0.75 inches [19.05 mm] in diameter.
Distinguishing Properties (click this to reveal) - make your list of observations before peeking
Distinguishing Properties (click this to reveal) - make your list of observations before peeking
Distinguishing Physical Properties:
This obviously has a metallic luster, and has a brassy or "gold" appearance.
The crystals are common, they can be cubes and/or octahedrons, and even some cube-octahedron combinations. Parallel lines (or striations) across the crystal faces are common.
If you streak this mineral it is usually dark grey to black with a greenish tinge.
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