Formula :
Ca4[F2/(OH)2/Si3O_8_] * 2 H2O
System: trigonal Hardness:3 Rarity:rare
Strunz id:VIII/H.34-50 -
SILICATES
Name origin: Named after the Greek "ζέω" (zeo), to boil, and "φύλλον" (phyllos), leaf, alluding to its occurrence in hemispheral foliated forms and intumescence (swelling) on heating.
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