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Prehnite & Pumpellyite

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PJM79213

Prehnite & Pumpellyite

Ex J & S Mommers Collection

Description Tabs

Description
Locality: 
Lower New Street Quarry, Paterson, Passaic County, New Jersey, United States of America
Size Range: 
Small miniature (3-4.5 cm)
Size: 
1.5 × 4 × 2.6 cm
Description

An oldtime specimen from the Ruth Coulsell Collection and label New Street Quarries, Paterson New Jersey. No indication as to which of the quarries.

This is a fine old specimen, dark green pumpellyiye on a light coloured basaltic matrix with light green prehnite hemispheres over the top. Where the pumpellyite and prehnite are in contact the prehnite appears to be included and therefore far darker in colour.

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

Pumpellyite

Synonym Of: 

Pumpellyite-(Al)

Formula: 
Ca2(Al,Fe2+,Mg)Al2(Si2O7)(SiO4)(OH,O)2·H2O
Strunz: 
9.BG.20
Hardness: 
0.0

Pumpellyite-(Fe2+)

Formula: 
Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2·H2O
Strunz: 
9.BG.20
Hardness: 
0.0

Pumpellyite-(Fe3+)

Formula: 
Ca2(Fe3+,Mg,Fe2+)(Al,Fe3+)2(Si2O7)(SiO4)(OH,O)2·H2O
Strunz: 
9.BG.20
Hardness: 
0.0

Pumpellyite-(Mg)

Formula: 
Ca2MgAl2(Si2O7)(SiO4)(OH)2·H2O
Strunz: 
9.BG.20
Hardness: 
5.5

Pumpellyite-(Mn2+)

Formula: 
Ca2(Mn2+,Mg)(Al,Mn3+,Fe3+)2(Si2O7)(SiO4)(OH)2·H2O
Strunz: 
9.BG.20
Hardness: 
0.0
Group Parent: 
Pumpellyite Group
Earthstones Australia

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