Wiluite - Encyclopedia
Class : Silicates
Subclass : Sorosilicates
Crystal system : Tetragonal
Chemistry : Ca19MgAl4(Al,Mg)8(B,◻)4◻[(SiO4)10]O(O,OH)9
Rarity : Very rare
Wiluite is isostructural with vesuvianite but unlike the latter contains boron and is associated with wollastonite and olive green grossulars (viluites) in a serpentinized skarn. It is a mineral that was discovered in the 90's and which owes its name to its locality of discovery : the Wilui River in Russia. The wiluite occurs in well-formed truncated parallelepipedic crystals with a dark green or brown to black color, sometimes terminating in pyramid. It is a very rare new mineral and very little known to collectors.
Wiluite in the World
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Wiluite in France
This mineral is not present in the French underground.
Twinning
Wiluite has no twinned crystals known.
Fakes and treatments
No scam known for this mineral.
Hardness : 6
Density : 3.6
Fracture : Irregular
Trace : White
TP : Opaque to translucent
RI : 1.721 to 1.725
Birefringence : 0,004
Optical character : Uniaxial +
Pleochroism : Hardly visible
Fluorescence : None
Solubility : Hydrochloric acid
Magnetism : None
Radioactivity : None