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Wiluite is a dark green, brownish, or black blocky silicate mineral with formula: Ca19(Al,Mg,Fe,Ti)13(B,Al,[ ])5Si18O68(O,OH)10. It has a Mohs hardness of 6 and a specific gravity of 3.36. It has a vitreous lustre, poor cleavage and an irregular brittle fracture. It crystallizes in the tetragonal system and occurs as well-formed crystals with good external form. It is isostructural with the vesuvianite group and is associated with wollastonite and olive-green grossulars (viluites) in a serpentinized skarn.
Additional recommended knowledge
The minerals that wiluite and viluite refer to have often been confused, and may refer to grossular, or wiluite. It was discovered in the 1990s and named for the Wilui River region, Saha Republic (Yakutia), Russia.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Wiluite". A list of authors is available in Wikipedia.|