Langban Rare Minerals, Sweden

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Allactite

#38590

Details
Data
Provenance
Resources

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

Mineralpedia: View Allactite
On Dakota Matrix: Previously Sold Allactite
On Dakota Matrix: Other Available Allactite
WebMineral: View Allactite
Mindat: View Allactite

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Aminoffite

#38726

Details
Data
Provenance
Resources

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

Mineralpedia: View Aminoffite
On Dakota Matrix: Previously Sold Aminoffite
On Dakota Matrix: Other Available Aminoffite
WebMineral: View Aminoffite
Mindat: View Aminoffite

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Andradite

in Calcite - #PD38734

Details
Data
Provenance
Resources

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

Mineralpedia: View Andradite
On Dakota Matrix: Previously Sold Andradite
On Dakota Matrix: Other Available Andradite
WebMineral: View Andradite
Mindat: View Andradite

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Barylite

with Berzeliite - #5592

Details
Data
Provenance
Resources

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.