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Riebeckite from
Masokani Hill, Sultan Hamud, Umba Valley Region, Makueni County, Kenya


Locality type:Hill
Classification
Species:Riebeckite
Formula:◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Comments:Riebeckite from this locality is analysed with the following results: SiO2 50,21%, Ti02 0,12%,Al2O3 1,66%, Fe2O3 16.51%, FeO 21.23%. MnO 0.09%, MgO 1.07%. CaO 0.55% Na2O 6.46% K20 0.52% OH 1,65% F 0,10%. Total 100.17.

Acicular crystals up to 18 cm with quartz in vugs are described.
Quality for species:Good crystals or rich for species - important (!)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Riebeckite data
Locality Data:Click here to view Masokani Hill, Sultan Hamud, Umba Valley Region, Makueni County, Kenya
Data Identifiers
Mindat Occurrence Record ID:775845
Long-form Identifier:1:3:775845:4
GUID (UUID V4):95c23954-1ec8-4640-883d-64839c944980
References
Campell Smith, W., Hey, M.H. and Kempe, D.R.C. (1968): Riebeckite from near Sultan Hamud, Machalcos District, Kenya. Mineralogical Magazine 36, 1164-1167. [http://www.minersoc.org/pages/Archive-MM/Volume_36/36-284-1164.pdf]
Reference Search (possible matching items)
Campbell Smith, W., Hey, M. H., Kempe, D. R. C. (1968) Riebeckite from near Sultan Hamud, Machakos District, Kenya. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (284) 1164-1167 doi:10.1180/minmag.1968.036.284.13
Journal (article/letter/editorial)
SHORT COMMUNICATIONS Riebeckite from near Sultan Hamud, Machalcos District, Kenya FINE specimens of striated...acieular riebeckite, sometimes radiating or platy, from the western flank of Masokani Hill, 9 miles NNW...NNW. of Sultan Hamud, Machakos District, Kenya, were acquired by the British Museum (Natural History)...Hitchen, then Senior Government Geologist in Kenya. The riebeckite crystals, which are up to 6 cm in length...(asbestiform riebeckite) has also been found. In one specimen (B.M. 1944,107) the riebeckite and quartz
Deer, W. A., Howie, R. A., Zussman, J. (1997) Rock-Forming Minerals (2nd ed.) Vol. 2B - Double-Chain Silicates. The Geological Society, London.
Book (volume)
Glaucophane-Ferro-glaucophane Magnesio-riebeckite—Riebeckite Eckermannite-Ferro-eckermannite Leakeite—Ferro-leakeite...AlbO>7](OH,F)> (d) Sodic amphiboles Glaucophane-riebeckite Na>(Mg,Fe**)3(Al,Fe**)s[Sig05](OH,F)2 Ecker...Mg3;Al, for Mg; and Sig for SigAl, respectively. Riebeckite, arfved- sonite and kozulite involve the isovalent...which M4 is occupied by Ca or Na (e.g. actinolite-riebeckite), and pairs with and without A-site occupancy...category are anthophyllite, tremolite, actinolite, riebeckite (known as crocidolite when asbestiform) and grunerite
Deer, W. A., Howie, R. A., Zussman, J. (2013) An Introduction to the Rock-Forming Minerals (3rd ed.) Mineralogical Society of Great Britain and Ireland. doi:10.1180/dhz
Book (edition)
olite, Hornblendes, Kaersutite, Glaucophane, Riebeckite, Richterite–Ferrorichterite, Magnesiokatophorite–Katophorite...photomicrographs from the W.S. MacKenzie collection The McGraw-Hill Companies for figures from Igneous Petrology; Microscopic...green mica, Benson no. 4 Pegmatite, north Mtoko region, Zimbabwe (Hornung, G. & Knorring, O. von, 1962...rodingite, altered gabbro, Hunting Hill quarry, Montgomery County, Maryland (Larrabee, D.M., 1969, Bull...(clinopyroxene) + SiO2. The shaded area is the apparent region of ‘bracketing’ of metamorphic pressure and temperature
 
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