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Datolite & Apophyllite

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CR47677

Datolite & Apophyllite

With Antique Label

Description Tabs

Description
Locality: 
Rio Fromm, Castelrotto, Siusi Alp, South Tirol, Trentino-Alto Adige, Italy
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.5 × 5.5 × 4.5 cm
Largest Crystal: 
1.30cm
Description

Large, lustrous datolite crystals with minor apophyllite on matrix from an old collection with nice old label.

Collected 1956 - very good old time specimen.

Mineral Data
What's on the rock

Datolite

Formula: 
Ca(HBSiO5)
Strunz: 
9.AJ.20
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Nødebro Mine (Nøddebro), Arendal Iron Mines, Arendal, Aust-Agder, Norway

Apophyllite

Synonym Of: 

Fluorapophyllite-(K)

Formula: 
KCa4(Si8O20)(F,OH)·8H2O
Strunz: 
9.EA.15
Hardness: 
4.5 - 5.0

Fluorapophyllite-(Na)

Formula: 
NaCa4(Si8O20)F·8H2O
Strunz: 
9.EA.15
Hardness: 
4.0 - 5.0

Hydroxyapophyllite-(K)

Formula: 
KCa4(Si8O20)(OH,F)·8H2O
Strunz: 
9.EA.15
Hardness: 
4.0 - 5.0