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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
Add the rough piece to your collection
more matte white
Approx weight: 330g
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
