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Whitlockite Jahnsite-(CaFeMg) & Rockbridgeite

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SER567595

Whitlockite Jahnsite-(CaFeMg) & Rockbridgeite

Description Tabs

Description
Locality: 
Lagoa do Andres, Picuí, Borborema Province, Paraiba, Brazil
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 4.5 × 2.2 cm
Description

A new occourence for Brasil is whitlockite, an uncommon phosphate that features colourless tiny crystals on brown jahnsite and black rockbridgeite; EDS confirmed; self collected on 2016

Mineral Data
What's on the rock

Whitlockite

Formula: 
Ca9Mg(PO4)6(HPO4)
Group Parent: 
Whitlockite Group
Strunz: 
8.AC.45
Crystal System: 
Trigonal
Hardness: 
5.0 -
Colour: 
Colourless, grey-white, light pink, light yellow; colourless in transmitted light
Type Locality: 
Palermo No. 1 Mine Grafton County, New Hampshire, USA

Jahnsite-(CaFeMg)

Formula: 
CaFe2+Mg2Fe3+2(PO4)4(OH)2·8H2O
Hardness: 
0.0
Type Locality: 
Tom's quarry (Tom's Phosphate quarry; Clutterbuck Bros; PM 315; Sobey; BHP; ML 4993), Kapunda, North Mt Lofty Ranges, Mt Lofty Ranges, South Australia, Australia...

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