• Sturmanite
  • Sturmanite
  • Sturmanite
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Sturmanite

$3,500.00   €2,958  £2,550.00 approx.  

This specimen is priced in US dollars, all other prices are approximate.

ID: CC7333
A large and quite incredible crystal of Sturmanite measuring to 6 cm tall with several crystals developed out from one side, from the N'Chwaning II mine at Kuruman in the Kalahari Manganese Field of South Africa.  Sturmanite is a rare and complex hydrous calcium-iron sulphate also containing boron and was only identified in 1983.  The first thing you notice when handling this specimen is its extreme light weight, reflecting its relative density (specific gravity) of just 1.847.  The crystal’s colour varies from a translucent burnt barley-sugar, through burnt apricot to highlights of lemon yellow and with an overall waxy lustre.  This is a magnificent ex-matrix crystal of hexagonal form which terminates perfectly with a bevelled hexagonal symmetry towards a flat hexagonal pinacoid face.  Interestingly, the bevelled faces are completely smooth, displaying beautiful concentric zoning whereas the pinacoid is gently botryoidal, as highlighted by the play of reflected light.  A superb and stunning example of the rare sulphate Sturmanite.

Details

Dimensions
6.0 × 4.3 × 3.0 cm
Categories
Locality
N'Chwaning II Mine, N'Chwaning Mines, Kalahari Manganese Fields, Northern Cape Province, South Africa, Africa

Minerals on Specimen

Minerals on specimen
Sturmanite

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