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RUBIES IN A ZOISITE HOST ROCK FROM THE LONGIDO MINE, TANZANIA raided on a stand 10cm high x 8cm wide x 5cm deep This specimen is a corundum variety ruby in zoisite. The rock is considered a corundum bearing amphibolite, the amphibolite is the dark material. it is called hornblende and only comes from Longido in north-east Tanzania.