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Description
Hydroxyapophyllite with two large intersecting crystalsLocale: 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
Locale: 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 wulfenite, and can be colorless to semi-translucent white with inclusions.
This piece has several large hydroxyapophyllite crystals, including two that are intersecting (the larger is 1cm). The 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 clusters 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.
UV reactivity Visible calcite fluoresces and phosphoresces moderate red under 365 nm UV light. It can cause the hydroxyapophyllite crystals growing over it to glow a faint red—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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