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Fergusonite Pyrophanite Arfvedsonite On Orthoclase

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SLN209341

Fergusonite Pyrophanite Arfvedsonite On Orthoclase

Description Tabs

Description
Locality: 
Mount Malosa, Zomba, Southern Region, Malawi
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.8 × 6.7 × 5.3 cm
Description

Nice specimen from Malawi with an interesting association of fergusonite in prismatic and elongated dark nut-brown crystals, pyrophanite in hexagonal crystals and rare arfvedsonite in big dark blue almost black crystals on matrix of orthoclase crystallized

Mineral Data
What's on the rock

Fergusonite

Synonym Of: 

Fergusonite-(Ce)

Formula: 
(Ce,La,Nd)NbO4
Strunz: 
7.GA.05
Hardness: 
5.5 - 6.5

Fergusonite-(Y)

Formula: 
YNbO4
Strunz: 
7.GA.05
Hardness: 
5.5 - 6.5

Pyrophanite

Formula: 
Mn2+TiO3
Strunz: 
4.CB.05
Hardness: 
5.0 - 6.0
Type Locality: 
Harstigen Mine, Pajsberg, Persberg district, Filipstad, Värmland, Sweden

Arfvedsonite

Formula: 
[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Strunz: 
9.DE.25
Hardness: 
5.0 - 6.0
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

Orthoclase

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Hardness: 
6.0
Streak: 
White

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