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Gypsum Var Selenite On Siderite

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CLB172634

Gypsum Var Selenite On Siderite

ex collection Erwin Anger, Röslau
Pseudomorph

Description Tabs

Description
Locality: 
Boldut Mine, Cavnic, Maramureș County, Romania
Size Range: 
Cabinet (10-18 cm)
Size: 
16.8 × 11 × 5.3 cm
Largest Crystal: 
8.00cm
Description

Large selenite crystals up to 8 cm on a dark brown siderite matrix. This siderite matrix is a pseudomorph after manganoan calcite. Looks in parts like dolomite, but there are a lot of platy chips-like micro-crystals and other hollow ones. Almost botryoidal backside shown in last picture. Mosrt of the selenite crystals (including the biggest, most prominent) are undamaged. Only a few dings at the edges. If you don't like the brownish look you can carefully clean the selenite crystals - I tried it with a wet thumb. Works fine.

Mineral Data
What's on the rock

Gypsum

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

Selenite

Variety Of: 

Gypsum

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

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

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