Blade Calcite Although calcite is a common mineral, its presence in this size makes this specimen interesting. Calcite commonly occurs in ‘rhombohedron’ crystal form (a shape with six rhomb-shaped faces), however, here calcite crystals display, so-called, ‘scalenohedron’ form with sharp crystal edges, and hence the name ‘blade’ calcite is given. weight: 90,000 carats origin: USA […]

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Coloured gemstone specialist Gemfields plc raised US$55 million from the sale of Montepuez rubies in Singapore from November 6 to 10, Pallinghurst announced recently. A total of 76 lots comprising of rubies extracted by Montepuez Ruby Mining Limitada were offered; 71 of which or 93 percent, were sold. The nine Montepuez auctions held since June […]

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