Natural Jeremejevite, 3.12 Ct (01152) - Clean / RARE - Collectors

Jeremejevite is a rare aluminium borate mineral with variable fluoride and hydroxide ions. Its chemical formula is Al6B5O15(F,OH)3.

It was first described in 1883for an occurrence on Mt. Soktui, Nerschinsk district, Adun-Chilon Mountains, Siberia. It was named after Russian mineralogist Pavel Vladimirovich Eremeev (Jeremejev, German) (1830–1899).

It occurs as a late hydrothermal phase in granitic pegmatites in association with albite, tourmaline, quartz and rarely gypsum. It has also been reported in the Pamir Mountains of Tajikistan, Namibia and the Eifel district, Germany

• ITEM CODE 01152

• QUANTITY 1

• GEMSTONE VARIETY Natural Jeremejevite

• TREATMENT None

• COLOUR Colourless

• WEIGHT 3.12 Ct.

• TRANSPARENCY Transparent

• CLARITY VS ( Eye Clean with an Interesting swirly inclusion)

• SHAPE OR CUT Rectangular , with Trenched corners

• MEASUREMENTS 9.44 x 7.07 x 5.21 mm.

• LUSTER Vitreous / Good

• REFRACTIVE INDEX 1.653 - 1.1783 (DR- 0.130)

• SPECIFIC GRAVITY 3.28 (+/-, 0.1)

• HARDNESS 6.5 - 7.5 (ref. data)

• COMPOSITION Rare aluminium borate mineral with variable fluoride and hydroxide ions

• CERTIFICATE - EGL Memo (third party lab) included

• ORIGIN Unknown

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