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Gypsum

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PDM666660

Gypsum

Floater

Description Tabs

Description
Locality: 
Lake Gilles, Corunna Station, Iron Knob, Eyre Peninsula, South Australia, Australia
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.1 × 3.8 × 3 cm
Description

Aesthetic floater specimen formed by four gypsum crystals, associated in two groups of two contact twinned crystals. They are very well formed, elongated along the c-axis with vitreous lustre and translucent, slightly yellowish. Gypsum crystals from this locality are usually tabular on (010), but in this specimen the (010) face is almost missing because of great development of prism {110}. It is a floater, in very good condition and extremely fluorescent in blue and white-yellow under medium and short UV illumination. It is also white phosphorescent after short UV excitation.

Further information: The Mineralogical Record, 13-3 (1982).

Ex. Iván Blanco twins collection.

Mineral Data
What's on the rock

Gypsum

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

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