Heulandite-Ca : (Ca,Na)5(Si27Al9)O72·26H2O
Mordenite : (Na2,Ca,K2)4(Al8Si40)O96·28H2O
As recorded:
Rat's Nest claim, Challis, Bay Horse Mining District, Custer Co., Idaho, USA
6cm x 6cm x 4cm
Photo added to mindat.org
“Beautiful specimen of well crystallized pink heulandite crystals up to 15 mm in fibrous white mordenite matrix. One of the best I have seen from this locality. From a recent find in 2001 (see Mineral News August 2001). Overall size of mineral specimen: 6x6x4 cm. Size of individual crystals: 10-15 mm.”
John Betts - 30th November 2000
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