Jeremejevite

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Jeremejevite
Specific gravity
3.28 – 3.31
Optical propertiesUniaxial (-)
Refractive indexnω = 1.653 nε = 1.640
Birefringence0.0130
PleochroismColorless – light blue-violet
Other characteristicsPiezoelectric
References[2][3][4]

Jeremejevite is an

better source needed
]

It was first described in 1883[6] as small, single crystals in loose granitic debris in Mt. Soktui, Nerschinsk district, Adun-Chilon Mountains, Siberia.[7] It was named after Pavel Vladimirovich Eremeev, Russian mineralogist, engineer and professor, who collected the first specimens (Jeremejev, German; 1830–1899).[4]

Properties

Jeremejevite is a mineral that shows pleochroic properties, which is an optical phenomenon in which the mineral's color appears to change depending on the angle at which it is viewed. Blue specimens from Namibia show a light cornflower blue to colorless to light yellow pleochroism, while yellow materials show light yellow to colorless pleochroism. This mineral is also piezoelectric, meaning that it would generate electricity when under mechanical stress.[7]

Mining and localities

Jeremejevite occurs as a late

granitic pegmatites in association with albite, tourmaline, quartz and rarely gypsum. It has also been reported in the Pamir Mountains of Tajikistan, Namibia and in micro-crystalline form at the Eifel district, Germany.[4] It was first found in facetable form in Namibia, which were blue-green pyramidal crystals up to 2 cm (0.79 in). Later, there was a new source revealed in Namibia, near Usakos in 2001.[7] Nowadays, most of the stones on the market are from that deposit.[5]

Jewelry industry

Blue jeremejevite in rare, clear crystal form. Image width: 1.5 mm (0.059 in).

As an OH-end member, scientists have been able to synthesize jeremejevite, but only in micro-crystalline form, without fluorine. This synthesized variant of the mineral has no use in the jewelry industry.

Typically, faceted gems can reach up to 5 carats, but usually they range between less than 1 carat and 2 carats. However, new sources produced much larger faceted stones, the biggest faceted gem weighing 254 carats. This gem was found in Sri Lanka in 1990.

Even though jeremejevite is a relatively durable stone, it should not be cleaned using ultrasound cleaning or steaming; the stone usually contains liquid inclusions, which could shatter the stone if cleaned using these methods. It is recommended to clean them with warm water, a mild detergent, and a soft brush instead.[7]

Due to its high value and rarity, it is considered a collectors' stone, who purchase it in mineral form, hence only a few specimens had been faceted so far.[5]

References

  1. S2CID 235729616
    .
  2. ^ Jeremjevite on Mindat.org
  3. ^ Jeremejevite on Webmineral.com
  4. ^ a b c Handbook of Mineralogy
  5. ^ a b c "Rare Jeremejevite Gems at AJS Gems". www.ajsgem.com. Archived from the original on 2022-03-08. Retrieved 2022-03-08.
  6. ^ Damour A. Note sur un borate d'alumine cristallisé de la Siberie. Nouvelle espèce minerale // Bulletin de la Société minéralogique de France. 1883. 6. N 1. P. 20-23.
  7. ^ a b c d "Jeremejevite Value, Price, and Jewelry Information". gemsociety.org. International Gem Society. Retrieved 2022-03-07.
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