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Specimen dimensions: 2⅞ x 1¾ x 1⅝ inches (71x48x40mm)
Specimen weight: 7¼ ounces (208 grams)
Collection: Northridge 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:
Color is not diagnostic, but the luster is typical of this mineral. It usually has this dull, waxy look (but it definitely does not feel waxy!)
What a great example of conchoidal fracture - it's classic.
Students often spend too much time worrying about the weathering rind - these rocks have been sitting outside for thousands of years, they have often been transported, buried, and weathered (hard life). A rough and ragged and often crusty surface is common.
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