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Freyalite.
ОглавлениеSilicate of E and Th, with Al, Fe, Mn, Na, aq., etc. Cer = 31·3; ThO₂ = 28·4; ZrO₂ = 6·3%.
Amorphous.
G = 4·06-4·17. H = 6. Brown; opaque; lustre resinous.
Brevig, Norway.