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Potassic-ferro-sadanagaite from
Somanya，Kpong and Pore Areas, Asuogyaman District, Eastern Region, Ghana


Locality type:Occurrence
Classification
Species:Potassic-ferro-sadanagaite
Formula:KCa2(Fe32+Al2)(Al3Si5O22)(OH)2
Comments:Holm (1974) provide a wet-chemical analysis corresponding to potassic-ferro-sadanagaite:
SiO2, 35.52%
TiO2, 1.798%
Al2O3, 19.57%
Fe2O3, 6.51%
FeO, 18.45%
MnO, 0.51%
MgO, 2.72%
CaO, 9.27%
Na2O, 2.84%
K2O, 2.58%

When this is normalized (using Locock 2014), the empirical formula becomes (K0.509Na0.509)Σ1.018 (Ca1.537Na0.343Mn0.067Fe0.052)Σ1.999 (Feii2.336Al1.069FeIII0.758Mg0.628Ti0.209)Σ5 (Si5.498Al2.502)Σ8 O22 ((OH)1.581O0.419)Σ2. With exception of a slightly high A content (1.018 apfu), Holm's data normalizes well. However, his other analyses show a too high C3+ content, and the interpretation of this analysis as potassic-ferro-sadanagaite is therefore questioned.
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Potassic-ferro-sadanagaite data
Locality Data:Click here to view Somanya，Kpong and Pore Areas, Asuogyaman District, Eastern Region, Ghana
Data Identifiers
Mindat Occurrence Record ID:1510038
Long-form Identifier:1:3:1510038:6
GUID (UUID V4):0
References
Holm, R. F. (1971). Some garnets, pyroxenes, and amphiboles from nepheline gneisses in Ghana. American Mineralogist: Journal of Earth and Planetary Materials, 56(11-12), 2111-2122.
Locock, Andrew J. (2014) An Excel spreadsheet to classify chemical analyses of amphiboles following the IMA 2012 recommendations. Computers & Geosciences, 62. 1-11 doi:10.1016/j.cageo.2013.09.011
 
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