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***The "crack" visible in images is a natural plane through the sandstone that is semi-stable
This makes them pretty forgiving for new keepers who are trying to learn how to maintain a steady humidity for their isopod enclosures
Calcite and aragonite often grow together
the availability of silica that is the basis for the quartz family
revealing the radial pattern of crystal growth
Black tourmaline Chalcedony nodules ***The "crack" visible in imagesLocale: Erongo Mountain, Namibia Approx dimensions: 3 x 2. 5 x 2. 5" Approx weight: 287g ** Loose piece on base This statuesque piece of black tourmaline, known as schorl, has the mercedes termination and glossy high luster characteristic of the Erongo region. The piece is effectively three intergrown crystals in a stepped formation, with partial crystals attached at one end. The sides are beautifully striated on the partial crystals, with more
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