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Mg5(Al,Cr, Fe)2Si3O10(OH)8]
is a hydrous silicate with a monoclinic IIb-2 polytype, with symmetry C2 = m, and is extremely rare and of high interest for mineral collectors Mohs Hardness 2 to 2.5 Specific Gravity 2.60 to 2.64 Cleavage Quality Perfect Refractive Index 1.571 to 1.597 RI for the alpha, beta, and gamma rays is 1.571–1.588, 1.571–1.588, 1.576–1.597 Optical Character Biaxial/+,- Birefringence 0.003 Pleochroism is notable, violet to hyacinth-red Color (General) Lilac to Purple Transparency: Transparent, Translucent Lustre: Pearly, Greasy, Dull (Earthy) Michael O’Donoghue, Gems, Sixth Edition (2006) Anthony et al, Handbook of mineralogy (2001) Gemdat.org (2012)
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$196.00