Russian Rhodusite Magnesio-Riebeckite slab 18.6 oz (525 grams)
Russian Rhodusite Magnesio-Riebeckite slab 18.6 oz (525 grams) and measuring ~8" x 2.5" x 5/8". Dark Blue polished, grey blue dry abestiform fibers. Polishes well but brittle.
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