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


Locality type:Occurrence
Classification
Species:Potassic-ferro-ferri-taramite
Formula:K(CaNa)(Fe32+Fe23+)(Al2Si6O22)(OH)2
Comments:Holm (1974) provide a wet-chemical analysis corresponding to potassic-ferro-ferri-taramite:
SiO2, 37.58%
TiO2, 1.66%
Al2O3, 15.11%
Fe2O3, 20.75%
FeO, 9.25%
MnO, 1.06%
MgO, 1.06%
CaO, 5.53%
Na2O, 5.1%
K2O, 2.8%

When this is normalized (using Locock 2014), the empirical formula becomes (K0.55Na0.434)Σ0.984 (Na1.088Ca0.912)Σ2 (FeIII2.404Feii1.191Al0.526Mg0.243Ti0.192Mnii0.138)Σ4.694 (Si5.785Al2.215)Σ8 O22 ((OH)1.615O0.385)Σ2. This gives a low total in the C position ( 4.694) of which 3.122 apfu is trivalent. Both of these indicate analytical errors.
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Potassic-ferro-ferri-taramite data
Locality Data:Click here to view Somanya，Kpong and Pore Areas, Asuogyaman District, Eastern Region, Ghana
Data Identifiers
Mindat Occurrence Record ID:1425445
Long-form Identifier:1:3:1425445:9
GUID (UUID V4):0
References
 
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