Diopside

specimen number:
9711750

location:
Merelani Hills, Simanjiro, Manyara, Tanzania

description:
Glassy gemmy crystals of diopside to almost 1.5 cm in size in a cluster with graphite. This is in good condition.

The Merelani Hills in Tanzania, globally renowned for the discovery of unique gemstone deposits, saw initial localized finds by local inhabitants and prospectors in the early 1960s, with formal commercial mining development accelerating significantly through government restructuring and private operations from the late 1980s onward without a definitive permanent closure date as active operations continue. Geologically, the area is characterized by Proterozoic metasedimentary gneisses and complex folded rocks shaped by intense tectonic activity within the Mozambique Belt, providing the high pressure and temperature metamorphic environment necessary for gemstone formation. Diopside is a common rock-forming silicate mineral belonging to the pyroxene group, typically crystallizing in monoclinic prismatic forms with distinct cleavage. It frequently develops within igneous rocks like basalt and peridotite, as well as through the contact metamorphism of carbonate-rich rocks such as limestone and dolomite, and it is widely recognized for its varying shades of green, including vibrant chrome-rich varieties utilized in jewelry and prospecting.

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