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black onyx diamond mining equipment in sudan

Dec 03 2007 · Diamond cutter Gemologist IT Pro conny I live in THailand which apparently is one of the few sources of black spinel having a mine in Kanchanaburi but even local traders there refer to black spinel as being black onyx hence my confusion the black spinel will have a higher RI than other spinel 1740 up to 1777 ... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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