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Prehnite & Apophyllite

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PJM198022

Prehnite & Apophyllite

Description Tabs

Description
Locality: 
Nashik District, Maharashtra, India
Size Range: 
Cabinet (10-18 cm)
Size: 
11 × 7 × 4.5 cm
Description

 A cluster of beige coloured prehnite crystals stacked in sticks which appear to have formed around laumontite, which subsequently been dissolved. Scattered across the face of this specimen are small clear, blocky apophyllite crystals

Mineral Data
What's on the rock

Prehnite

Formula: 
Ca2Al2Si3O10(OH)2
Strunz: 
9.DP.20
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Karoo dolerites, Cradock, Chris Hani District, Eastern Cape Province, South Africa

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
Earthstones Australia

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