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A group of basic phosphate minerals with the general formula indicated above, where:
A denotes a large divalent cation (Ba, Sr, Pb) plus a vacancy, or two monovalent cations (K, Na),
E denotes a small divalent cation (Fe, Mn, Mg) plus a vacancy, or two Na cations,
M is a small divalent cation (Fe, Mn, Mg), whose identity defines the root-name: Fe, arrojadite, or Mn, dickinsonite,
R is a small trivalent cation (Al, Fe) and
W is a hydroxide or fluoride ion.
Classification of Arrojadite Group
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Chemical Properties of Arrojadite Group
|Simplified for copy/paste:||A2 E2CaNa2+xM13R (HPO4)1-x(PO4)11W2|
Relationship of Arrojadite Group to other Species
|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 Arrojadite Group
Cámara, F., Oberti, R., Chopin, C., Medenbach, O. (2006): The arrojadite enigma: I. A new formula and a new model for the arrojadite structure. American Mineralogist, 91, 1249-1259
Chopin, C., Oberti, R., Cámara, F. (2006): The arrojadite enigma: II. Compositional space, new members and nomenclature of the group. American Mineralogist, 91, 1260-1270.
Internet Links for Arrojadite Group
Localities for Arrojadite Group
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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Locality Updated: Ametista do Sul, Alto Uruguai region, Rio Grande do Sul, BrazilFrom Paul De Bondt, 18th Dec 2014 14:13:04