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0 item @ $0.00  

Langban Rare Minerals, Sweden

Friday, 28 March 2014 05:00 PM

Langban is one of the richest mineral deposits on Earth. We'll throw out many, many varieties of rare minerals.

Eveite

with Akrochordite - #PD38725
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Mn2+2AsO4(OH) 
Availability
Sold
Size
Capsule 
Tagged
arsenate  
Special Info
Type Locality 

Extremely rare manganese arsenate - Eveite. There are two or three really small crystals on this already small 1mm piece in a capsule. It is unconfirmed but I believe it is Eveite.  See prov. label for more information. The main crystal is about 0.2mm in size. One photo actually has a pinhead for scale.  It could very well be the real deal there not a whole lot of minerals with this type of green. I was told that the former dealer of this specimen more than likely acquired several Eveites from Harvard.


Eveite

Formula
Mn2+2AsO4(OH) 
Crystal System
Orthorhombic 
Cleavage
Good, None, None 
Luster
Vitreous (Glassy) 
Color
apple green 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness
Collection
Phillips Collection
Special Info
Type Locality
Mineralpedia
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Finnemanite

#PD38567
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Pb5(As3+O3)3Cl 
Availability
Sold
Size
6 x 5.5 x 3 cm - Sm Cabinet 
Tagged
arsenate  
Special Info
Type Locality 
Special Info
XRD Confirmed 

Here's a Langban treasure highly sought after and exceedingly rare. It has been verified by XRD. Both sides contain flat lying dark grey, elongated, crystals, mal-formed probably from tight conditions which would restrict the growth. The longest crystal is 1cm with numerous smaller crystals. It is much like the photo in the photo on page 118 of the Langban book by Bollmark et al. Granted they are not exposed as much however the matrix is the same, a granular hematite, as well as  the reddish orange or yellowish crust in which the crystals grew. The backside has numerous crystals also just as obvious under a scope. There is a small 1mm to less veinlet along the side of the specimen, which also has one small crystal.The adamantine luster is much like that of cerussite. The prismatic nature is unlike cerussite however. It's a definte match as shown on the XRD pattern.

It has an old inked number on the backside, unfortunately I do not have the old label to go with the number. But there is one label typed on the backside of an old business card from "Camden Mineral Company" of a one E. W. Rushton from Camden, Maine.


Finnemanite

Formula
Pb5(As3+O3)3Cl 
Crystal System
Hexagonal 
Cleavage
Distinct, None, None 
Luster
Subadamantine 
Color
gray, black 
Class
Hexagonal - Pyramidal 
Hardness
2.5 
Collection
Phillips Collection
Special Info
Type Locality
Special Info
XRD Confirmed

Fredrikssonite

#PD38728
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Mg2Mn3+O2(BO3
Availability
Sold
Size
1.5 x 1 x 1 cm - Thumbnail 
Special Info
Type Locality 

Blackish thin, long prismatic crystals suspended in matrix. Filipstad is the only locality for this minerals.


Fredrikssonite

Formula
Mg2Mn3+O2(BO3
Crystal System
Orthorhombic 
Crystal Habit
Prismatic 
Cleavage
Poor, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
reddish brown 
Streak
yellowish brown 
Class
Orthorhombic - Dipyramidal 
Hardness
Collection
Phillips Collection
Special Info
Type Locality

Galena

#PD38586
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
PbS 
Availability
Sold
Size
9 x 6 x 4 cm - Sm Cabinet 
Tagged
sulfide  

An impressive chunk of Galena pot-marked like a meteorite. Has two old tags. What is left of the oldest is not worth the scan. The other is a Thurston's label. Has a stuck on label. Extra for shipping!


Galena

Formula
PbS 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Massive - Granular, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Metallic 
Color
light lead gray, dark lead gray 
Streak
grayish black 
Class
Isometric - Hexoctahedral 
Fracture
Brittle 
Hardness
2.5 
Collection
Phillips Collection
Mineralpedia
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Mindat
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Gonyerite

#PD38723
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Mn2+5Fe3+(Si3Fe3+)O10(OH)8 
Availability
Sold
Size
2.5 x 1.5 x 1.5 cm - Thumbnail 
Special Info
Type Locality 

Deep red radial plates to 3mm across.


Gonyerite

Formula
Mn2+5Fe3+(Si3Fe3+)O10(OH)8 
Crystal System
Orthorhombic 
Crystal Habit
Radial, Platy 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
dark brown, brownish black, bright green 
Streak
chocolate brown 
Class
Orthorhombic 
Fracture
Flexible 
Hardness
2.5 
Collection
Phillips Collection
Special Info
Type Locality
Mineralpedia
View Gonyerite
On Dakota Matrix
Previously Sold Gonyerite
On Dakota Matrix
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Mindat
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Hausmannite

with Richterite - #PD38752
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Mn2+Mn3+2O4 
Availability
Sold
Size
6 x 6 x 6 cm - Sm Cabinet 

What would a Langban update be without a Hausmannite, right? This is a fairly nice specimen with a large vug 3x2cm in size with numerous well-formed crystals. The neat thing about the specimn are the fantastic deep orange-red Ruchterite crystals. The largest is 3cm and is perfectly terminated. The others are much smaller but nice.


Hausmannite

Formula
Mn2+Mn3+2O4 
Crystal System
Tetragonal 
Crystal Habit
Massive - Granular, Pseudo Octohedral 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
brownish black, grayish 
Streak
dark reddish brown 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Uneven 
Hardness
5.5 
Collection
Phillips Collection

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