Umbozerite

umbozerite

ussingite

belovite

schizolite

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Formula: Na₃Sr₄ThSi₈(O,OH)₂₄
Unclassified silicate, thorium-bearing mineral
Crystal System: Amorphous
Specific gravity:
Hardness: 5
Colour: Bottle-green, rapidly changes to green-brown or brown
Common impurities: Ti,Ce,Fe,U,Mn,Ca,Ba,K
Strongly RADIOACTIVE
Environments

Hydrothermal environments

Localities

At the type locality, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia, umbozerite occurs as a metamict mineral, bottle-green to greenish-brown in colour. It forms irregular masses and poorly formed tetragonal crystals up to 3 X 1 mm in ussingite veinlets, cutting alkalic rocks of the upper part of the differentiated complex. Associated minerals include ussingite, sphalerite, belovite, schizolite and niobium minerals of the lomonosovite group (AM 60.340-341).
Other associated minerals include manganese-bearing pectolite and niobium-bearing minerals of the murmanite group (HOM).

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