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Gypsum On Glauberite

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Gypsum On Glauberite

Description Tabs

Description
Locality: 
Lake Bumbunga, Lochiel, Mount Lofty Ranges, South Australia, Australia
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.2 × 3.9 × 2.7 cm
Description

A large flat diamond shaped glauberite crystal forms the platform for a large cluster of smaller crystals to grow on top in a rosette fashion.

The glauberite is coated with snow white gypsum which forms as an alteration product on many of these specimens once taken out of the brine of this salt lake and exposed to air.

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
Gondwana Minerals
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