Moving mountains for you
Switch currency

Current Live Auctions

Current Live Fixed Price Sales

Robertsite & Frondelite

Views:
Watches:
SER120316

Robertsite & Frondelite

Description Tabs

Description
Locality: 
Mangualde, Viseu District, Portugal
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2 × 2 cm
Description

Numerous brown robertsite spheres and brown flat crystals of frondelite

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

Frondelite

Formula: 
Mn2+Fe3+4(PO4)3(OH)5
Strunz: 
8.BC.10
Hardness: 
4.5
Type Locality: 
Sapucaia Mine (Proberil mine), Sapucaia do Norte, Galiléia, Doce valley, Minas Gerais, Brazil