description Prehnite Overview
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 Territory. [Mindat mineral data](https://www.mindat.org/min-3277.html)
help Prehnite FAQ
What is prehnite made of?
Prehnite is an orthorhombic calcium aluminosilicate mineral. Its chemical formula is Ca2Al2Si3O10(OH)2.
Where was prehnite first described?
Prehnite was described in 1788 from the Karoo dolerites near Cradock in South Africa. It was named for Hendrik von Prehn, a Dutch colonial officer associated with bringing specimens to Europe.
Why is prehnite named prehnite?
The mineral was named after Hendrik von Prehn. He is credited with bringing specimens from South Africa to Europe.
What crystal system does prehnite have?
Prehnite belongs to the orthorhombic crystal system. It is a calcium aluminosilicate with the formula Ca2Al2Si3O10(OH)2.
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