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Formula: Mg2Cr3+O2(BO3)
Monoborate, ludwigite group,
forms a series with ludwigite
Crystal System: Orthorhombic
Specific gravity: 3.91 calculated
Hardness: 5
Streak: Greyish green
Colour: Black to greenish black
Magnetism: Very weakly ferromagnetic
Environments
Savelievaite is a new mineral, approved in 2021 and to date (October 2024) reported only from the type locality.
Localities
At the type locality, the Malaya Kharamatalou river (left bank), Voikar-Syninskiy ultrabasite complex, Shuryshkarskiy
District, Yamalo-Nenets Autonomous Okrug, Russia, savelievaite was found in a
chromitite body. Savelievaite and
chromium-enriched ludwigite occur
in clinochlore veinlets and are associated with earlier
magnesiochromite, spinel,
chromite, pargasite,
diopside, forsterite,
serpentine, magnetite and
pentlandite. Savelievaite forms prismatic, acicular or fibrous
crystals up to 0.05 × 0.4 mm, usually assembled in radiating or chaotic clusters up to 1 × 1.5 mm across. It is opaque,
black to greenish-black. The lustre is vitreous for prismatic crystals and silky for fibrous aggregates
(MM 88.4.430-438).
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