Formula :
(Mg,Fe2+)7[(F,OH)2/(SiO4)3]
System: orthorhombic Hardness:6 Rarity:not common
Strunz id:VIII/B.4-30 -
SILICATES
Name origin: Named in 1813 by Jacques Louis, Comte de Bournon in honor of Sir Abraham Hume [February 20, 1749 London, England, UK – March 24, 1838 Wormley Bury. England. UK], English connoisseur and collector of gems, minerals, and artwork.
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