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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.

Allactite

#38590
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Mn2+7(AsO4)2(OH)8 
Availability
Sold
Size
6 x 4 x 3 cm - Sm Cabinet 
Tagged
arsenate  

Excellent specimen of this rare manganese arsenate found in only a handful of worldwide localities including of course Franklin. There are exceptional crystals on this specimen some showing good terminations and prismatic faces. The whole blackened side I believe is Allactite with a bit of manganese crust. Originally from the Scalisi Collection.


Allactite

Formula
Mn2+7(AsO4)2(OH)8 
Crystal System
Monoclinic 
Cleavage
Good, None, None 
Luster
Vitreous - Greasy 
Color
brown red, greenish brown, purple red, pink 
Class
Monoclinic - Prismatic 
Hardness
4.5 
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Aminoffite

#38726
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Ca3(BeOH)2Si3O10 
Availability
Sold
Size
2 x 1.5 x 1.5 cm - Thumbnail 
Tagged
beryllium  
Special Info
Type Locality 

An exceptionally rich specimen with no less than 18 waterclear to murky tetragonal dipyramidal crystals from 0.25 to .75mm. At least four crystals are to 0.75mm. Some crystals are full and complete others are partial and half hidden by matrix.  A very rare beryllium silcate found at Langban and in Russia.


Aminoffite

Formula
Ca3(BeOH)2Si3O10 
Crystal System
Tetragonal 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, light yellow 
Streak
white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
5.5 
Collection
Phillips Collection
Special Info
Type Locality

Andradite

in Calcite - #PD38734
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Ca3Fe3+2(SiO4)3 
Availability
Sold
Size
7 x 3.5 x 4.5 cm - Sm Cabinet 

Several 3 to 6mm black euhedral crystals in Calcite.


Andradite

Formula
Ca3Fe3+2(SiO4)3 
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Euhedral Crystals, Massive 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
black, yellowish brown, red, greenish yellow, gray 
Streak
white 
Class
Isometric - Hexoctahedral 
Fracture
Conchoidal 
Hardness
6.5-7 
Collection
Phillips Collection
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Barylite

with Berzeliite - #5592
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
BaBe2Si2O7 
Availability
Sold
Size
5 x 5 x 2 cm - Miniature 
Tagged
beryllium  
Special Info
Type Locality 

Excellent clear platy crystals in a vug lined with yellow Berzeliite in Tilasite. The largest Barylite is 1mm across and there are about seven more which are smaller in the same vug. This is a very good specimen with more going on than meets the eye.


Barylite

Formula
BaBe2Si2O7 
Crystal System
Orthorhombic 
Crystal Habit
Platy 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous (Glassy) 
Color
bluish, colorless, white 
Streak
white 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle 
Hardness
6-7 
Collection
Ex. Gary Grenier Collection
Special Info
Type Locality
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On Dakota Matrix
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Berzeliite

#PD38560
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
NaCa2Mg2(AsO4)3 
Availability
Sold
Size
3.5 x 3.5 x 3 cm - Miniature 
Tagged
arsenate  
Special Info
Type Locality 

Yellow crystal grains to 1mm throughout matrix. Rich!


Berzeliite

Formula
NaCa2Mg2(AsO4)3 
Crystal System
Isometric 
Cleavage
None, None, None 
Luster
Resinous 
Color
orange, sulfur yellow 
Streak
white 
Class
Isometric - Hexoctahedral 
Fracture
Brittle - Conchoidal 
Hardness
4.5-5 
Collection
Phillips Collection
Special Info
Type Locality
SOLD
Berzeliite - PD38722
Berzeliite - PD38722

Berzeliite

#PD38722
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
NaCa2Mg2(AsO4)3 
Availability
Sold
Size
5 x 3.5 x 3 cm - Miniature 
Tagged
arsenate  
Special Info
Type Locality 

A 13 x 6mm yellow grain in matrix.


Berzeliite

Formula
NaCa2Mg2(AsO4)3 
Crystal System
Isometric 
Cleavage
None, None, None 
Luster
Resinous 
Color
orange, sulfur yellow 
Streak
white 
Class
Isometric - Hexoctahedral 
Fracture
Brittle - Conchoidal 
Hardness
4.5-5 
Collection
Phillips Collection
Special Info
Type Locality

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