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Apophyllite

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BSM571995

Apophyllite

ex Philadelphia Academy of Natural Sciences

Description Tabs

Description
Locality: 
Kaiserstuhl Area, Baden-Württemberg, Germany
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
4.5 × 8 × 6.8 cm
Description

Originally labelled as faujasite it has subsequently been relabelled apophyllite. Both minerals are listed as occurring in the Kaiserstuhl area. This is an interesting old time specimen with some damage but nevertheless there are plenty of undamaged crystals to study. There are a number of twinned crystals which resemble twinned faujasite crystals but the single bladed crystals resemble neither faujasite or apophyllite from this location.

 For anyone who wants to do further work this is an ideal opportunity. The specimen dates from around 1850 and comes with labels and original mineral tray.  There is also a green label attached (not typical of the Philadelphia Academy of Natural Sciences collection specimens) which reads "Zeolite 1185". 

Mineral Data
What's on the rock

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

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