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Gmelinite On Quartz

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GMB612615

Gmelinite On Quartz

Rare Mineral

Description Tabs

Description
Locality: 
Blomøy, Øygarden, Hordaland, Norway
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2 × 1.5 cm
Description

On massive quartz sherd perch nicely single arranged crystals of gmelinite-Ca. Very unusual material from a pocket in a quartz inclusion in gneiss that yielded probably some of the best gmelinite crystals in Europe, the pocket was entirely removed recently while constructing a seafloor power line access point, no more material was recovered, very good piece, better than the one in the Kongsberg mining museum! See also references in Mineralienwelt 22 (4), 78-80 and STEIN 40 (3),14-15 

Mineral Data
What's on the rock

Gmelinite

Synonym Of: 

Gmelinite-Ca

Formula: 
(Ca,Na2)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5

Gmelinite-K

Formula: 
(K2,Na2,Ca)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5

Gmelinite-Na

Formula: 
(Na2,Ca)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5
Group Parent: 
Zeolite Group

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

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