page_title: Sturmanite
hierarchical_section_title: Sturmanite
caption_attribution_description: English: Sturmanite Locality: N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org) Size: 5.4 x 4.2 x 1.7 cm. A distinctive Sturmanite specimen consisting of a dozen or so sharp .8 cm hexagonal crystals with great luster and an appealing bronze-toned color. These partially gemmy crystals have a very interesting habit - basically hexagonal tabular crystals with truncated pyramidal terminations. Very sharp and very attractive. Ex. Charlie Key stock. Deutsch: Sturmanit Fundort: N'Chwaning Mines, Kuruman, Kalahari manganese fields, Nordkap , Südafrika (Fundort bei mindat.org) Größe: 5.4 x 4.2 x 1.7 cm.
context_page_description: Sturmanite is a rare sulfate mineral with the chemical formula Ca₆Fe³⁺₂(SO₄)2.5(OH)₁₂ · 25 H₂O. It crystallises in the tetragonal system and it has a Moh's hardness of 2.5. Sturmanite has a bright yellow to amber colour and falls in the ettringite group. It was named after Bozidar Darko Sturman, Croatian-Canadian mineralogist and Curator Emeritus of Mineralogy, Royal Ontario Museum.
context_section_description: Sturmanite is a rare sulfate mineral with the chemical formula Ca₆Fe³⁺₂(SO₄)2.5(B(OH)₄)(OH)₁₂ · 25 H₂O. It crystallises in the tetragonal system and it has a Moh's hardness of 2.5. Sturmanite has a bright yellow to amber colour and falls in the ettringite group. It was named after Bozidar Darko Sturman (born 1937), Croatian-Canadian mineralogist and Curator Emeritus of Mineralogy, Royal Ontario Museum.
caption: Distinctive sturmanite on matrix from the N'Chwaning Mines. Size: 5.4 x 4.2 x 1.7 cm. Ex.Charlie Key Stock
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