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Helvine Svanbergite Fluorapatite Rhodochrosite & Fluorite

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BCK720293

Helvine Svanbergite Fluorapatite Rhodochrosite & Fluorite

Martin Jensen collection
Classic Locality

Description Tabs

Description
Locality: 
Sweet Home Mine, Alma District, Park County, Colorado, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.8 × 1.4 × 0.9 cm
Description

You are bidding on a small, aesthetic thumbnail collected at the Sweet Home mine by Martin Jensen in 2003. The specimen consists of a plate of quartz crystals with a larger, rounded rhodochrosite crystal, numerous pale bluish-green prisms of fluorapatite and abundant small light purple fluorite cubes. There is also a single, tiny pseudocube of svanbergite/goyazite in the very center of the sample. The highlight of the specimen however is the single, orange tetrahedron of helvine perched on a corroded tetrahedrite crystal. This is one of very few known samples of helvine from the locality and it was verified by EDS by Martin shortly after collecting. Probably the rarest species from this prolific locality and if you collect minerals from this mine it's a must have! 

Mineral Data
What's on the rock

Helvine

Formula: 
Mn2+4(Be3Si3O12)S
Strunz: 
9.FB.10
Crystal System: 
Isometric
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Friedefürst Mine, Breitenbrunn, Breitenbrunn District, Erzgebirge, Saxony, Germany

Svanbergite

Formula: 
SrAl3(PO4)(SO4)(OH)6
Strunz: 
8.BL.05
Crystal System: 
Trigonal
Hardness: 
5.0
Streak: 
white
Type Locality: 
Hålsjöberg (Horrsjöberg), Torsby, Värmland, Sweden

Fluorapatite

Formula: 
Ca2Ca3(PO4)3F
Strunz: 
8.BN.05
Crystal System: 
Hexagonal
Hardness: 
5.0
Streak: 
White
Type Locality: 
Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany

Rhodochrosite

Formula: 
MnCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.0
Streak: 
White
Type Locality: 
Cavnic Mine (Kapnikbánya), Cavnic (Kapnic; Kapnik), Maramureș Co., Romania

Fluorite

Formula: 
CaF2
Strunz: 
3.AB.25
Crystal System: 
Isometric
Hardness: 
4.0
Streak: 
White
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

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