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Jahnsite-(CaMnMn)

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Description
Locality: 
Cubos-Mesquitela-Mangualde Area, Mangualde, Viseu District, Portugal
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 1.2 × 1.1 cm
Description

Jahnsite-(CaMnMn) is a phosphate mineral from the Jahnsite group. It was first described in 1990 and named after the pegmatite expert Richard H. Jahns. It is a typical secondary product formed in complex granite pegmatites by the alteration of primary phosphates. Here, the mineral forms brown crystals.
 

Mineral Data
What's on the rock

Jahnsite-(CaMnMn)

Formula: 
{Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2·8H2O
Strunz: 
8.DH.15
Hardness: 
4.0
Streak: 
White
Type Locality: 
Cubos-Mesquitela-Mangualde area, Mangualde, Viseu District, Portugal

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