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Dalyite & Janhaugite

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SKY636518

Dalyite & Janhaugite

Rare Mineral

Description Tabs

Description
Locality: 
Gjerdingselva, Nordmarka, Lunner, Viken, Norway
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.7 × 1.6 × 1.4 cm
Description

Pale tan crystal aggregates of dalyite associated to orange brown janhaugite.

Dalyite and janhaugite are very rare zirconium minerals.

Mineral Data
What's on the rock

Dalyite

Formula: 
K2ZrSi6O15
Strunz: 
9.EA.25
Crystal System: 
Triclinic
Hardness: 
7.5
Type Locality: 
Green Mountain, Ascension Island, Saint Helena

Janhaugite

Formula: 
(Na,Ca)3(Mn2+,Fe2+)3(Ti,Zr,Nb)2(Si2O7)2O2(OH,F)2
Strunz: 
9.BE.17
Hardness: 
5.0
Type Locality: 
Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway

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