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Prehnite with Actinolite inclusions, Mali
A very pretty specimen of green ball-shaped Prehnite with needley included Actinolite crystals from the Kayes Region, Mali.
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.
Actinolite, calcium magnesium iron silicate, has a formula of Ca2(Mg,Fe)5Si8O22(OH)2.
The name is from the Greek aktinos, "ray", in reference to the common crystal habit of radiating crystals.
Measures 4.6 x 3.5 x 3.2 centimeters.
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- Item #: Prehnite8-11-1
