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Hjalmarite from
Taguchi mine, Shitara, Kitashitara County, Aichi Prefecture, Japan


Locality type:Mine
Classification
Species:Hjalmarite
Formula:Na(NaMn)Mg5(Si8O22)(OH)2
Chemical Analyses:
Oxide wt%:
1
SiO254.28 %
TiO20.52 %
Al2O30.23 %
Fe2O3*4.42 %
FeO*5.25 %
MnO10.06 %
NiO0.18 %
MgO13.45 %
CaO1.29 %
SrO0.18 %
Na2O6.62 %
K2O1.00 %
F0.32 %
H2O (by stoichiometry)1.77 %
-O=F-0.13 %
Total:99.44 %
Empirical formulas:
1(Na0.57K0.19Sr0.02â—»0.23)(Na1.32Mn2+0.47Ca0.20)(Mg2.96Mn2+0.78Fe2+0.65Fe3+0.49Ti0.06Al0.04Ni0.02)[Si8.00O22]([OH]1.74F0.15O0.11)
Sample references:
1 -
Frank K. Mazdab collection (from a dealer-purchased sample acquired for yoshimuraite; additional description and analytical data, see https://www.rockptx.com/fkm-276-to-fkm-300/#FKM-299 ).
Comments:the abundant amphibole in the sample was previously referred to as "richterite", but the high Mn and Fe contents indicate that the composition more appropriately falls along the hjalmarite-[ferri-ghoseite] join.

normalized to 8Si=8 gives B-site occupancy as Na = 1.32 apfu; Mn2+ = 0.47 apfu; Ca = 0.20 apfu. Fe2O3 and FeO calculated from total Fe by charge balance; H2O calculated by stoichiometry.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Hjalmarite data
Locality Data:Click here to view Taguchi mine, Shitara, Kitashitara County, Aichi Prefecture, Japan
Data Identifiers
Mindat Occurrence Record ID:1331051
Long-form Identifier:1:3:1331051:8
GUID (UUID V4):0
References
Frank K. Mazdab collection (from a dealer-purchased sample acquired for yoshimuraite
additional description and analytical data, see https://www.rockptx.com/fkm-276-to-fkm-300/#FKM-299 ).
 
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