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Mineralpedia Details for Umbozerite

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Umbozerite

Umbozerite

Named after Lake Umbozero in the Kola Peninsula of Russia near where Umbozeroite finds its type locality at the Umbozero mine. Occuring only in Russia, it is found “in pneumatolytic-hydrothermal veins cutting alkalic rocks in the upper part of a differentiated alkalic massif.” Umbozeroite is radioactive.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/umbozerite.pdf

Formula
Na3Sr4ThSi8O23(OH) 
Crystal System
No Crystals 
Crystal Habit
Metamict, Pseudo Tetragonal 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
bottle green, greenish brown 
Class
Amorphous - No Crystals 
Fracture
Conchoidal 
Hardness
WebMineral
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Mindat
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Umbozerite from Lovozero Massif, Kola Peninsula, Russia

Umbozerite
            from Lovozero Massif, Kola Peninsula, Russia Brown thin prismatic crystals to 1cm in Ussingite(?) matrix.
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Umbozerite from Pegmatite #60, Karnasurt Mt., Lovozero Massif, Kola Peninsula, Russia

Umbozerite
            from Pegmatite #60, Karnasurt Mt., Lovozero Massif, Kola Peninsula, Russia

Radiating acicular sprays to 1cm embedded in Ussingite matrix. Because of the Thorium content of this mineral it is typically or always found as metamict product. This mineral is found in only a handful of localities all in alkalic deposits as reflected by the Ussingite matrix.

Click thumbnail images for larger view.

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