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Khademite Römerite Coquimbite

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SMM901106

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: 
Miniature (4.5-7 cm)
Size: 
6 × 4 × 4 cm
Description

This magnificent cabinet, in addition to having remarkable romerite crystals, probably among the largest ever found, splendid purple coquimbite crystals and pale pink clusters of fine krausite crystals, hosts several clusters of colorless tabular khademite crystals.
The largest khademite crystals present here measure about 4 mm and are therefore of a very considerable size for this species. They are two coupled crystals that you can easily identify certainly in the first two or three photos.
Khademite comes from the exceptional discovery of sulphate made a couple of years ago but is represented here for the first time because the samples found were very few (I think in the order of 20 or 30 in all) had never been distributed yet.
According to the finders this is one of the samples with the best and largest crystals.
The largest are clearly visible to the eye even in the whole photo but, in addition to those, there are at least a dozen groups scattered here and there. 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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