Hydroxyapophyllite Feldspar This large specimen is one

This large specimen is one of my favorites of the Erongo black tourmaline

They have alligator growth forms

like this tapered point

or as if the edge has been peeled up away from the quartz like a tutu

This specimen is a thin crust of ferrous (iron-based) matrix with dusty red oxidation on the back

Hydroxyapophyllite Feldspar This large specimen is oneLocale: N'Chwaning II Mine, South Africa Approx dimensions: 2. 25 x 1. 5 x . 75" Approx weight: 47g 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