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Tvedalite & Chiavennite

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HEF649921

Tvedalite & Chiavennite

Description Tabs

Description
Locality: 
Johs Nilsens Quarry, Tvedalen, Larvik, Vestfold og Telemark, Norway
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 1.3 × 1.8 cm
Description

XRD confirmed tvedalite and chiavennite. The concentration of tvedalite increases to the middle of the creamy-white sphaerulites.

Analysis attached

Mineral Data
What's on the rock

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

Chiavennite

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

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