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Gypsum Psm Glauberite

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PDM749286

Gypsum Psm Glauberite

Pseudomorph

Description Tabs

Description
Locality: 
Getafe, Madrid, Spain
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.3 × 5.8 × 2.5 cm
Description

This specimen is of good size and representative for the locality and for this kind of replacement, glauberite into gypsum. It is clearly polycrystalline where the gypsum crystals are randomly oriented. The original glauberite crystal was tabular {001}, with {110} and prism {111} moderately developed.

Even if these pseudomorphs are known since the end of the XIX century they are quite unknown for the general collector, even in Spain, because the old quarries where they were found were lost long ago. However, due to the construction of the connexion of the M50 and A4 highways, we were able to extract some interesting crystals. The biggest reached 30 cm!.

Mineral Data
What's on the rock

Gypsum

Formula: 
CaSO4·2H2O
Strunz: 
7.CD.40
Hardness: 
2.0
Streak: 
White.

Glauberite

Formula: 
Na2Ca(SO4)2
Strunz: 
7.AD.25
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.0
Streak: 
White
Type Locality: 
El Castellar Mine, Villarrubia de Santiago, Ocaña, Toledo, Castile-La Mancha, Spain

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