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They have the same chemical composition (silica) but different crystal structure (cryptocrystalline vs
UV reactivity The white calcite fluoresces moderately well under 365 nm UV light
Approx weight: 320g
Selenite is the crystal-clear form of gypsum
The broken ends of stalactites reveal a curiosity: some are hollow
Hydroxyapophyllite Siderite They have the same chemicalLocale: N'Chwaning II Mine, South Africa Approx dimensions: 2. 5 x 1. 75 x . 25" Approx weight: 25g 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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