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brecciation
it has the same chemical composition (silica) but different crystal structure (cryptocrystalline vs
to be polished into tumbles
Cubaris sp
Hydroxyapophyllite with two large intersecting crystals Fossil brecciationLocale: N'Chwaning II Mine, South Africa Approx dimensions: 2. 5 x 1. 75 x 1" Approx weight: 71g This specimen features hydroxyapophyllite crystals with lizardite and calcite on matrix. Properly called "hydroxyapophyllite (K)," hydroxyapophyllite is a variety of apophyllite that is typically colorless. It more frequently grows cubic crystals, but these specimens from the renowned N'Chwaning Mines region form tabular square crystals similar to
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