Spessartine

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Spessartine

 

(from the Spessart range in the Federal Republic of Germany), a mineral of the garnet group, a manganese-containing aluminogarnet having the composition Mn3AI2[SiO4]3 and containing typical isomorphic impurities of Fe2+, Mg2+, Ca2+, and Y3+. Spessartine crystallizes in the cubic system, forming crystals typical of garnets or, frequently, compact granular masses. The color varies, depending on impurities, from light pink to red-brown. The mineral has a hardness on Mohs’ scale of 7–7.5 and a density of 3,800–4,280 kg/m3. Spessartine is most commonly encountered in garnet pegmatites, metamorphic rocks, and skarns.

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5 cm, exceptionally sharp and brilliant and gemmy red-brown, coat faces of quartz crystals and altered granite, and also sit up individually, as alertly as any Pakistan spessartines.
We've seen thousands of Gilgit spessartines on white feldspar in recent years, but the new ones are exceptionally lustrous.