Shungite
Shungite is a particularly hard variety of Jet found only in Russia. Jet and Shungite are petrified coal; noncrystalline carbon with a metastable structure incapable of graphitization. Hardness 4 on the Mohs scale.
Pendant is approximately 30 x 20 x 8 mm with a 2.5 mm drilled hole and threaded with a black adjustable slip knot cord.
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