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Chiavennite & Tvedalite

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JYJ629138

Chiavennite & Tvedalite

Description Tabs

Description
Locality: 
A/S Granit Quarry, Tuften, Tvedalen, Larvik, Vestfold og Telemark, Norway
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.4 × 2.7 × 2.3 cm
Description

XRD confirmed chiavennite among smaller parts of tvedalite. 

Analysis attached

References:

Grice, J. D., Kristiansen, R., Friis, H., Rowe, R., Poirier, G.G., Selbekk, R.S., Cooper, M.A. & Larsen, A.O. (2013): Ferrochiavennite, a new beryllium silicate zeolite from syenite pegmatites in the Larvik Plutonic Complex, Oslo region, Southern Norway. Canadian Mineralogist. 51, 286.

 

 

Mineral Data
What's on the rock

Chiavennite

Formula: 
CaMnBe2Si5O13(OH)2·2H2O
Strunz: 
9.GF.25
Hardness: 
3.0
Type Locality: 
Tanno, Chiavenna, Valchiavenna, Sondrio Province, Lombardy, Italy

Tvedalite

Formula: 
(Ca,Mn)4Be3Si6O17(OH)4·3H2O
Strunz: 
9.DF.20
Crystal System: 
Orthorhombic
Hardness: 
4.5
Streak: 
white
Type Locality: 
Vevja Quarry, Tvedalen, Larvik, Vestfold, Norway
Analysis
Analysis Report - only: Chiavennite & Tvedalite