Formula :
(K,Na)10-11(Ca,Sr)[Al6Si12O36]2 * 15-18 H2O
System: hexagonal Hardness:4-5 Rarity:very rare
Strunz id:VIII/J.26-100 -
SILICATES
Name origin: Named for Perekrest Lily Alekseevna (Лилия Алексеевна Перекрест) (1928 - ), Instructor of Mineralogy at the Kirov Mining Technical School, Kirovsk, Russia.
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