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Prehnite, gemmy yellow crystals, Tanzania
A sharp specimen with gemmy yellow Prehnite crystal clusters from the Merehani Hills, Lelatema Mts., Arusha Region, Tanzania.
Prehnite is a basic Calcium aluminum silicate, sometimes with some iron. It has a formula of Ca2Al2Si3O10(OH)2. It is named for an 18th century Dutchman, Colonel van Prehn, who first brought specimens to Europe from South Africa.
Measures 3.2 x 2.6 x 2 centimeters.
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- Item #: Prehnite2-11-1
