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Manganite With Cryptomelane & Crandallite

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PJM41043

Manganite With Cryptomelane & Crandallite

Description Tabs

Description
Locality: 
Penrice Quarry, Angaston, Barossa Valley, Mount Lofty Ranges, South Australia, Australia
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.2 × 5.4 × 3.7 cm
Description

Lusterius bladed manganite crystals in cavities with dark grey cryptomelane and patches of white crandallite.

Manganite is unusual mineral to find in a phosphate deposit and this specimen was recovered in the late 1980's at the same time as the Angastonite was collected.

Mineral Data
What's on the rock

Manganite

Formula: 
Mn3+O(OH)
Strunz: 
4.FD.15
Hardness: 
4.0
Type Locality: 
Manganese deposit, Ilfeld, Nordhausen, Harz, Thuringia, Germany

Cryptomelane

Formula: 
K(Mn4+7Mn3+)O16
Strunz: 
4.DK.05a
Crystal System: 
Tetragonal
Hardness: 
5.0 - 6.5
Type Locality: 
Tombstone, Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA

Crandallite

Formula: 
CaAl3(PO4)2(OH)5·H2O
Strunz: 
8.BL.10
Crystal System: 
Trigonal
Hardness: 
5.0
Streak: 
White
Type Locality: 
Brooklyn Mine, Silver City, Tintic District, East Tintic Mts, Juab Co., Utah, USA
Earthstones Australia

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