Datolite vs Prehnite
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Datolite
Datolite is a calcium boron hydroxide nesosilicate mineral that commonly forms glassy crystals. It can also occur as massive or botryoidal material in cavities and veins of igneous rocks. The Lake Superior region of Michigan is known for colorful datolite nodules, which are collected as lapidary material and mineral specimens. Its boron-bearing composition distinguishes it from silicate minerals t...
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Prehnite
Prehnite is an orthorhombic calcium aluminosilicate mineral with the formula Ca2Al2Si3O10(OH)2. It was described in 1788 from the Karoo dolerites near Cradock in South Africa and named for Hendrik von Prehn, a Dutch colonial officer credited with bringing specimens to Europe. Pale green material is used as a gemstone, and gem-quality deposits are known around Wave Hill in Australia's Northern Terr...
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