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Robertsite & Rockbridgeite

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CLB80976

Robertsite & Rockbridgeite

Rare Mineral

Description Tabs

Description
Locality: 
Bendada Mines, Bendada, Sabugal, Guarda District, Portugal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 2.4 × 1.6 cm
Description

Rather good sample of rare inerals. While I trust the former owner with the names I'm not sue if he didn't mistake the localities. I think this could be from the Folgosinho Quarry.

Mineral Data
What's on the rock

Robertsite

Formula: 
Ca3Mn3+4(PO4)3O2·3H2O
Strunz: 
8.DH.30
Hardness: 
3.5
Streak: 
Red-brown
Type Locality: 
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Rockbridgeite

Formula: 
Fe2+Fe3+4(PO4)3(OH)5
Strunz: 
8.BC.10
Crystal System: 
Orthorhombic
Hardness: 
3.5 - 4.5
Type Locality: 
Midvale Mine, South Mountain, Midvale, Rockbridge Co., Virginia, USA

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