Allanite
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Physical & Optical Properties
Mohs Hardness
Value & Market
Where to Buy Allanite
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About Allanite
Allanite is a complex calcium iron aluminum sorosilicate of the epidote group, typically forming black to brownish black prismatic crystals with a submetallic luster in granites, pegmatites, and metamorphic rocks. It is strongly radioactive due to significant thorium and uranium content, and most specimens undergo partial metamictization over geological time, damaging their crystal structure. Faceted gem-quality allanite is exceedingly rare, valued mainly by mineral collectors.