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|System:||Trigonal||Colour:||Bright Yellow to amber|
|Name:||Name: In honor of Bozidar Darko Sturman (b. 1937), Slovenian-Canadian mineralogist and former Associate Curator of Mineralogy, Royal Ontario Museum, Toronto, Ontario, for his contributions to systematic mineralogy, in particular his studies of phosphate minerals from the Yukon and his refinement of methods used in optical mineralogy.|
Classification of Sturmanite
|IMA status:||Approved 1981|
|Explanation of status:||Although the Black Rock mine is the type locality for the mineral, it is believed that the actual type locality is the Wessels mine due to an error in labeling the type specimen. No subsequent specimens containing sturmanite or other minerals on the type specimen have been found since (similar material from Wessels was found from 5 pockets in the years 1978-1982).|
|Strunz 8th edition ID:||6/D.13-50|
|Strunz 9th edition ID:||7.DG.15|
|Nickel-Strunz 10th (pending) edition ID:||7.DG.15|
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
|Dana 8th edition ID:||188.8.131.52|
32 : COMPOUND SULFATES
4 : Hydrated Compound Sulfates containing Hydroxyl or Halogen
|Hey's CIM Ref.:||25.11.23|
25 : Sulphates
11 : Sulphates of Fe and other metals
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Type Occurrence of Sturmanite
|Type Locality:||Black Rock Mine, Black Rock, Kalahari manganese fields, Northern Cape Province, South Africa|
Occurrences of Sturmanite
|Geological Setting:||Secondary mineral in cavities in metamorphosed manganese deposits.|
Physical Properties of Sturmanite
|Diaphaneity (Transparency):||Transparent, Translucent|
|Comment:||Greasy on fracture surfaces.|
|Colour:||Bright Yellow to amber|
|Streak:||Pale yellow, greenish yellow, brownish orange (altered)|
|Density (measured):||1.847 g/cm3|
|Density (calculated):||1.855 g/cm3|
Crystallography of Sturmanite
|Class (H-M):||3m - Ditrigonal Pyramidal|
|Space Group:||P3 1c|
|Cell Parameters:||a = 11.16(3) Å, c = 21.79(9) Å|
|Ratio:||a:c = 1 : 1.953|
|Unit Cell Volume:||V 2,350.26 Å³ (Calculated from Unit Cell)|
|Morphology:||Dipyramidal tabular to elongated hexagonal crystals|
Optical Data of Sturmanite
|RI values:||nω = 1.499 - 1.500 nε = 1.497 - 1.505|
|Maximum Birefringence:||δ = 0.002|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Comments:||O= pale green|
E= pale yellowish green
Chemical Properties of Sturmanite
|Essential elements:||B, Ca, Fe, H, O, S|
|All elements listed in formula:||Al, B, Ca, Fe, H, Mn, O, S|
Relationship of Sturmanite to other Species
|Member of:||Ettringite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Sturmanite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Sturmanite
PEACOR, D.R., DUNN, P.J. & DUGGAN, M. (1983): Sturmanite, a ferric iron, boron analogue of ettringite. Canadian Mineralogist 21, 705-709.
Pushcharovsky, D.Yu., Lebedeva, Yu,S., Zubkova, N.V., Pasero, M., Bellezza, M., Merlino, S. and Chukanov, N.V. (2004): The crystal structure of sturmanite. Canadian Mineralogist 42, 723-729.
HOCHLEITNER, R. (1986): Sturmanit und Ettringit aus den Kalahari-Manganfeldern. Lapis, Jg. 10, Nr. 10, 19-24.
VON BENZIG, K.L., DIXON, R.D., POHL, D. & CAVALLO, G. (1991): The Kalahari manganese field: An update. Mineralogical Record 22, 292-293.
WEINER, K.L. & HOCHLEITNER, R. (1994): Sturmanit - Steckbrief. Lapis, Jg. 19, Nr. 2, 9-11.
CAIRNCROSS, B. & DIXON, R. (1995): Minerals of South Africa. Published by The Geological Society of South Africa, Johannesburg, 60-66 and 244-245.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Internet Links for Sturmanite
|Specimens:||The following Sturmanite specimens are currently listed for sale on minfind.com.|
Localities for Sturmanite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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