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60 - Offrettite (Rol)

Faujasite-Na, phillipsite and offretite - Limberg quarries - Sasbach - Kaiserstuhl - Baden-Württemberg - Germany (TL) (#:MINS9102)

The surface of the vugs of this specimen are covered by several octahedrycal minicrystals of Faujasite-Na, a rare zeolite from the type locality. Phillipsite and offretite in assication.

Formula :
(Ca,Na₂,Mg)₂[Al₂Si₄O₁₂]₂ * 16 H₂O
System: cubic Hardness:5 Rarity:rare
Strunz id:VIII/J.27-40 - SILICATES
Name origin: Named after Barthélemy Faujas de Saint-Fond (born in Montélimar on May 17th 1741; died on July 18th, 1819, in Saint-Fond), French geologist and writer on the origin of volcanoes. The Na-dominant member of the faujasite series.