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Khademite Römerite Coquimbite

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SMM989073

Khademite Römerite Coquimbite

Rare Mineral

Description Tabs

Description
Locality: 
Monte Arsiccio Mine, Sant'Anna di Stazzema, Stazzema, Lucca Province, Tuscany, Italy
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 2.5 × 2 cm
Description

This magnificent specimen, with nice purple coquimbite crystals, host several outstanding colorless tabular khademite single crystals and clusters.
The largest khademite crystals present here measure approximately 6.00 mm are therefore of a very considerable size for this species and the size of the central group is approximately 1.00 cm. (see photo 5)
Khademite comes from the exceptional discovery of sulphates made a couple of years ago at Monte Arsiccio but the samples found, of this rare species, were very few (I think in the order of 20 or 30 in all) The largest are clearly visible at naked eye in the photos but, in addition  to those, there are many other groups scattered here and there.
I don't know finds in the world with crystals of this size and quality, so they are probably the best khademite crystals ever found.
Also present on the sample there are beautiful clusters of single crystals of krausite on coquimbite (photo 7) dark brown crystals of römerite and silky white clumps of halotrichite.

Hardly repeatable!

"Personal Selection"

Boxed with Label
Mineral Data
What's on the rock

Khademite

Formula: 
Al(SO4)F·5H2O
Strunz: 
7.DB.10
Hardness: 
0.0
Type Locality: 
Kavir-e-Sagand, Saghand (Sagand; Saqand), Yazd Province, Iran

Römerite

Formula: 
Fe2+Fe3+2(SO4)4·14H2O
Strunz: 
7.CB.75
Hardness: 
3.0 - 3.5
Type Locality: 
Rammelsberg Mine, Rammelsberg, Goslar, Harz, Lower Saxony, Germany

Coquimbite

Formula: 
Fe2-xAlx(SO4)3·9H2O, x ~0.5
Strunz: 
7.CB.55
Hardness: 
2.5
Streak: 
white
Type Locality: 
Coquimbo Region, Chile

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