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Alabaster Psm Anhydrite

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PDM712925

Alabaster Psm Anhydrite

Pseudomorph

Description Tabs

Description
Locality: 
Rivas-Vaciamadrid, Madrid, Spain
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
10.2 × 7.5 × 6.5 cm
Description

White compact microcrystalline gypsum (variety alabaster) showing interesting spheroidal to ovoidal structures. These rounded nodules are far more rarely found in sedimentary sequences than the related “entherolitic” structures and are known as “chicken-wire” structures. These original concretional structures, formed by primary anhydrite are in this specimen completely replaced by secondary alabaster gypsum. It is a self-collected specimen, back in 1994, from a very small outcrop of the Manzanares river valley at the Lower Miocene evaporitic deposits in the locality of Rivas-Vaciamadrid.

Mineral Data
What's on the rock

Alabaster

Variety Of: 

Gypsum

Formula: 
CaSO4·2H2O
Strunz: 
7.CD.40
Hardness: 
2.0
Hardness: 
0.0

Anhydrite

Formula: 
CaSO4
Strunz: 
7.AD.30
Crystal System: 
Orthorhombic
Hardness: 
3.0 - 3.5
Type Locality: 
Salt mine, Hall valley, Hall, Innsbruck, Inn valley, North Tyrol, Tyrol, Austria

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