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and can make for interesting pieces to cut open
They have alligator growth forms
This large specimen is one of my favorites of the Erongo black tourmaline
with lower clarity due to natural inclusions
cyanobacteria grow in microbial mats
Hydroxyapophyllite Feldspar and can make for interestingLocale: 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
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