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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.

Magnetite

#PD38753
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Fe2+Fe3+2O4 
Availability
Sold
Size
8 x 7 x 4 cm - Sm Cabinet 

There is host of metallics on this specimen according to the previous tag. I cannot vouch for them all, but the previuos tag states there is: magnetite, cassiterite, chalcopyrite, bornite, bismuth and wittichenite. No doubt three is magnetite. That's all I see, There are some curious looking blue crystals and some green staining.


Magnetite

Formula
Fe2+Fe3+2O4 
Crystal System
Isometric 
Crystal Habit
Massive, Massive - Granular, Crystalline - Fine 
Cleavage
None, None, None 
Luster
Metallic 
Color
grayish black, iron black 
Streak
black 
Class
Isometric - Hexoctahedral 
Fracture
Sub Conchoidal 
Hardness
5.5-6 
Collection
Phillips Collection
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Manganohornesite

#PD38729
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Mn2+3(AsO4)2·8H2
Availability
Sold
Size
2 x 1 x 1 cm - Thumbnail 
Tagged
arsenate  
Special Info
Type Locality 

White acicular sprays. The identification is unconfirmed and this reminds me more of the white acuclar unknown which occured with the Nadorite on granular hematite. The unknown white acicular which occured with Nadorite was identified as Mimetite on one of my specimens. This can certainly be Mimetite.


Collection
Phillips Collection
Special Info
Type Locality

Marialite

with Galena - #PD38577
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
(Na,Ca)4(Si,Al)12O24(Cl,CO3,SO4
Availability
Sold
Size
7.5 x 4 x 4 cm - Sm Cabinet 

Bluish grey prismatic crystals to 6mm in Diopside matrix with Galena and Sphene.


Marialite

Formula
(Na,Ca)4(Si,Al)12O24(Cl,CO3,SO4
Crystal System
Tetragonal 
Cleavage
Distinct, Distinct, None 
Luster
Vitreous - Pearly 
Color
bluish, brownish, colorless, violet, greenish 
Streak
white 
Class
Tetragonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
5.5-6 
Collection
Phillips Collection
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On Dakota Matrix
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Molybdophyllite

with Hausmannite - #PD38573
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
Pb2Mg2Si2O7(OH)2 
Availability
Sold
Size
6 x 3 x 3 cm - Sm Cabinet 
Special Info
Type Locality 

A rich specimen with excellent foliated, pearly yellowish white to colorless plates to 4mm with Hausmannite. Four worldwide localities.


Molybdophyllite

Formula
Pb2Mg2Si2O7(OH)2 
Crystal System
Hexagonal 
Crystal Habit
Massive - Lamellar 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
colorless, pale green, pale yellow 
Streak
white 
Class
Hexagonal - Trapezohedral 
Hardness
3-4 
Collection
Phillips Collection
Special Info
Type Locality

Neotocite

#PD38569
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
(Mn2+,Fe2+)SiO3·H2
Availability
Sold
Size
6.5 x 4 x 3 cm - Sm Cabinet 

This has just a thin layer of this amorphous silca mineral, which is not actually sanctioned IMA mineral for lack of crystal structure.


Neotocite

Formula
(Mn2+,Fe2+)SiO3·H2
Crystal System
No Crystals 
Crystal Habit
Colloform, Amorphous 
Cleavage
None, None, None 
Luster
Resinous 
Color
black, dark brown, liver brown 
Streak
brown 
Class
Amorphous - No Crystals 
Fracture
Conchoidal 
Hardness
3-4 
Collection
Phillips Collection

Pinakiolite

#PD38583
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
(Mg,Mn2+)2(Mn3+,Sb5+)O2(BO3
Availability
Sold
Size
8 x 4 x 3.5 cm - Sm Cabinet 
Special Info
Type Locality 

Black or deep brown micaceous looking crystal plates. Pick at these crystals and you realize it is far from micaceous. It is hard and not easily broken. See old label in prov. tab indicating that it is from the Bolivia stope.


Pinakiolite

Formula
(Mg,Mn2+)2(Mn3+,Sb5+)O2(BO3
Crystal System
Monoclinic 
Crystal Habit
Tabular 
Cleavage
Good, None, None 
Luster
Adamantine - Metallic 
Color
black 
Streak
brown gray 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
Collection
Phillips Collection
Special Info
Type Locality

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