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allanite

A Dictionary of Earth Sciences | 1999 | 391 words | Copyright

allanite (orthite) Mineral, with the formula (Ca,Ce,Y,La,Th)2(AlFe)3Si3O12(OH); sp. gr. 3.4–4.2; hardness 5.0–6.5; monoclinic; light brown to black; pitchy to sub-metallic lustre; faintly radioactive; crystals normally prismatic, often tabular, sometimes massive; cleavage imperfect hardness; often occurs as an accessory mineral in granitic rocks, syenites, gneisses, and skarns.

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AILSA ALLABY and MICHAEL ALLABY. "allanite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.

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