Formula: [Na2][Fe32+Fe23+]Si8O22(OH)2
Colour:Usually black, also ...
Lustre:Vitreous, Sub-Vitreous
Hardness:5 - 5½


 Tiger's Eye, Riebeckite (Var.: Riebeckite), Hematite
Locality: Atikokan, Hutchinson Township, Rainy River District, Ontario, Canada (Locality at mindat.org)
Size: 11.7 x 9.4 x 8.8 cm.
A really strange, very showy double pseudomorph cabinet specimen from Ontario. This unique, highly lustrous, mushroom-shaped pseudo is quartz variety classically banded Tiger Eye after crocidolite (a fibrous asbestos mineral) after classic, hematite kidney ore. The "mushroom" cap of pseudomorphed hematite kidney ore sits atop the stem of beautiful, banded, fibrous, Tiger Eye. I have never seen anything quite like it. Not even another from the same place. It strikes me as a real oddity.Copyright © Rob Lavinsky

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