Hydroxyapophyllite
SKU: 45318629865

Hydroxyapophyllite

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Description

HydroxyapophylliteLocale: 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

Locale: 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 wulfenite, and can be colorless to semi-translucent white with inclusions.

The matrix on this specimen is very thin, and displays a well-formed pair of intersecting crystals at the center. The light matte brown mineral coating the specimen is lizardite, which often grows in small spots along the junctions of the hydroxyapophyllite crystal. Calcite druzy glitters through the lizardite and covers the back of the specimen. The calcite has also formed stacks of small scalenohedral crystals. The dark matrix is likely manganese-based; the N'Chwaning mines were established to extract the rich manganese ore in the area. Coffee-brown staining may be iron.

UV reactivity Calcite can cause the hydroxyapophyllite crystals growing over it to glow a weak red under 365 nm UV light—try it in a dark room with a strong flashlight. An unknown whitish mineral finely dusts areas of the specimen strongly fluoresces icy blue.

** Brittle warning! Hydroxyapophyllite specimens are somewhat delicate and may shed pieces; limit handling.

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SKU: 45318629865

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