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Ferroaluminoceladonite

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GFM1037751

Ferroaluminoceladonite

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Description Tabs

Description
Locality: 
Oxbow Dam, Baker County, Oregon, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2.5 × 1.5 cm
Description

 This rare member of the mica group appears here as green crystal aggregates. Very rich with colorless Heulandite-Ca xls and Stilbite-Ca xls up to 4 mm in size, on large fracture zones in Rhyolite. Old, newly examined samples, found on December 1, 1976.

Mineral Data
What's on the rock

Ferroaluminoceladonite

Formula: 
K(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
Strunz: 
9.EC.15
Crystal System: 
Monoclinic
Hardness: 
2.0 - 2.5
Streak: 
Pale gray
Type Locality: 
Hokonui Hills, South Island, New Zealand