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UV reactivity The white calcite fluoresces moderately well under 365 nm UV light
They have the same chemical composition (silica) but different crystal structure (cryptocrystalline vs
well-formed crystals
more matte white
Hydroxyapophyllite Siderite UV reactivity The white calciteLocale: 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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