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Hålsjöberg (Horrsjöberg), Torsby, Värmland, Sweden
© Knut Eldjarn
|Na may be replaced by minor Ca.|
|Name:||Named for the type locality at the Buranga pegmatite, Gatumba District, Western Province, Rwanda.|
Burangaite-Matioliite Series. Fe2+ analogue of Matioliite.
Several "Mg-rich" burangaites reported in the literature may in fact be matioliite (Atencio et al., 2006).
Classification of Burangaite
|IMA status:||Approved 1976|
|Strunz 8th edition ID:||7/D.11-120|
|Nickel-Strunz 10th (pending) edition ID:||8.DK.15|
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
|Dana 8th edition ID:||188.8.131.52|
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
|Hey's CIM Ref.:||19.14.9|
19 : Phosphates
14 : Phosphates of Fe and other metals
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Type Occurrence of Burangaite
|Type Locality:||Buranga pegmatite, Gatumba District, Western Province, Rwanda|
|Year of Discovery:||1976|
Crystallography of Burangaite
|Cell Parameters:||a = 25.09Å, b = 5.04Å, c = 13.45Å|
β = 110.91°
|Ratio:||a:b:c = 4.978 : 1 : 2.669|
|Unit Cell Volume:||V 1,588.79 Å³ (Calculated from Unit Cell)|
Optical Data of Burangaite
|RI values:||nα = 1.611 nβ = 1.635 nγ = 1.643|
|2V:||Measured: 58° , Calculated: 58°|
|Maximum Birefringence:||δ = 0.032|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Burangaite
Na may be replaced by minor Ca.
|Essential elements:||Al, Fe, H, Na, O, P|
|All elements listed in formula:||Al, Fe, H, Na, O, P|
Relationship of Burangaite to other Species
|Series:||Forms a series with Matioliite (see here)|
|Member of:||Dufrénite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Burangaite
|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 Burangaite
von Knorring, O., Lehtinen, M. and Sahama, T.G. (1977) Burangaite, a new phosphate mineral from Rwanda. Bulletin of the Geological Society of Finland 49, 33-36.
EK R., NYSTEN P. (1990: Phosphate mineralogy of the Hålsjöberg and Hökensås kyanite deposits. Geol. Fören. Stockholm Förhandl., 112, 9-18.
Selway, J.B., Cooper, M.A. and Hawthorne, F.C. (1997) Refinement of the crystal structure of burangaite. Canadian Mineralogist 35, 1515-1522.
American Mineralogist: 63: 793.
Atencio, D., J.M.V. Coutinho, Y.P. Mascarenhas, and J.A. Ellena (2006): "Matioliite, the Mg-analog of burangaite, from Gentil mine, Mendes Pimentel, Minas Gerais, Brazil, and other occurrences". Am. Mineral. 91:1932-1936.
Internet Links for Burangaite
Localities for Burangaite
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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