Formula : K2Ca4[(F,OH)/Si_7_O_18_(OH)]
System: triclinic Hardness:4-5 Rarity:very rare
Strunz id:VIII/F.22-20 -
SILICATES
Name origin: Named after its discovery locality, Davan stream near Vislopolovka village, between the Chara and Tokko Rivers, Saha Republic, Russia.
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