Mineral: Titanite
Locality: Koksha Valley, Khash & Kuran Wa Munjan Districts, Badakhshan Province, Afghanistan
Dimensions: 34 x 12 x 4 mm

Description: At left, extinction in vertical position. Also extinct when in horizontal position. At right in most translucent position at 45º. It repeats translucence four times (every 90º) when rotating 360º. That confirms it is biaxial? Sorry, I have my poor optics knowledge very oxidized.

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