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Jacobsite & Plumboferrite

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FNW43865

Jacobsite & Plumboferrite

Type Locality

Description Tabs

Description
Locality: 
Jakobsberg Mine, Nordmark, Filipstad, Värmland County, Sweden
Size Range: 
Thumbnail (1-3cm)
Size: 
1.8 × 2.3 × 1.4 cm
Largest Crystal: 
0.60cm
Description

Very interesting piece showing two uncommon specimens, both from the type locality.
Subedric jacobsite crystals of a good size for the species (2 to 6 mm.) with bright plumboferrite micro-crystals.

Mineral Data
What's on the rock

Jacobsite

Formula: 
Mn2+Fe3+2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
5.5 - 6.5
Type Locality: 
Jakobsberg Mine, Nordmark (Nordmarksberg), Filipstad, Värmland, Sweden

Plumboferrite

Formula: 
Pb2Fe3+11-xMn2+xO19-2x, x = 1/3
Strunz: 
4.CC.45
Hardness: 
5.0
Colour: 
Blackish
Streak: 
Red
Type Locality: 
Jakobsberg Mine, Nordmark (Nordmarksberg), Filipstad, Värmland, Sweden
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