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Mantienneite

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SKY822153

Mantienneite

Type Locality

Description Tabs

Description
Locality: 
Anloua, Martap, Vina, Adamaoua Region, Cameroon
Class: 
Crystal Group/Cluster
Size Range: 
Micromount (under 1cm)
Size: 
0.2 × 0.2 × 0.2 cm
Description

Mantienneite, is an extremely rare K-Mg-Al-Ti phosphate found only in 3 localities worldwide, it's present here as a lot of about 1 mm brown granules in a capsule. Some of the granules have microcrystals of the mineral.

Additional interest of this sample is the copy of the attached old label, the same than the one pictured in mindat for another sample of the same species, since the origin is the same (BRGM, Bureau of Recherches Geologiques and Minieres, signed by J.Mantienne after whom the mineral is named).

Cameroon only have two minerals with type locality, and mantienneite is one of them (the other being remondite-(Ce)). 

Mineral Data
What's on the rock

Mantienneite

Formula: 
KMg2Al2Ti(PO4)4(OH)3·15H2O
Strunz: 
8.DH.35
Hardness: 
3.0
Type Locality: 
Anloua, Adamaoua Plateau (Adamawa Plateau), Adamaoua Region, Cameroon

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