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Bementite & Sturmanite With Gaudefroyite

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SMS1084360

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Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
2.1 × 3.6 × 1.5 cm
Weight: 
8.21gr
Description

A silvery deposit of micaceous bementite on sturmanite which in turn is grown over gaudefroyite with hematite. The gaudefroyite has prismatic elongate black crystals. The sturmanite is basically massive.

Mineral Data
What's on the rock

Bementite

Formula: 
Mn7Si6O15(OH)8
Strunz: 
9.EE.05
Crystal System: 
Monoclinic
Hardness: 
6.0
Streak: 
White
Type Locality: 
Trotter Mine (Lehigh Mine), Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA

Sturmanite

Formula: 
Ca6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12·25H2O
Strunz: 
7.DG.15
Crystal System: 
Trigonal
Hardness: 
2.5
Type Locality: 
Black Rock Mine, Black Rock, Kalahari manganese field, Northern Cape Province, South Africa

Gaudefroyite

Formula: 
Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3
Strunz: 
6.AB.60
Hardness: 
6.0
Type Locality: 
Tachgagalt Mine, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco

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Shipping Information

Postage Area Price
Europe up to 500 grams
$12
Europe up to 1 kilogram
$16
United States up to 500 grams
$14
United States up to 1 kilogram
$18
Rest of world up to 500 grams
$14
Rest of world up to 1 kilogram
$18
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Estimated Delivery Time: Once shipped, the estimated delivery time is 4 to 7 business days worldwide.

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Combined Shipping: We do offer combined shipping. The cost is $4 added to the shipping cost per additional 500 grams. Please note that the packaging weight also needs to be taken into account. The average packaging weight is 150 grams to 300 grams for larger parcels.

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