General Information:
Chemical Formula:Na3Sr4ThSi8(O,OH)24
Composition:(Molecular Weight = 1,266.20 gm)Sodium 5.45 %
NaStrontium 27.68 %
SrThorium 18.33 %
ThSilicon 17.74 %
SiHydrogen 0.48 %
H Oxygen 30.33 %
O Empirical Formula: Na3Sr4ThSi8O18(OH)6
Environment:In ussingite veinlets cutting alkalic rocks.
IMA Status:Approved IMA 1974
Locality:Umbozero (Lake Umba), Kola Peninsula, Russia.
Name Origin:Named for the locality.
Physical Properties: Cleavage:None
Color:bottle green or greenish brown.
Density:3.6
Habits:Metamict - Mineral originally crystalline, now amorphous due to radiation damage., Pseudo Tetragonal - Crystals show a tetragonal shape.,
Hardness:5 - Apatite
Luster:Vitreous (Glassy)
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