Hjalmarite Root Name Group
A group of related mineral species
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About Hjalmarite Root Name Group
Formula:
A(Mn2+Na)(C5)(Si8O22)W2
The hjalmarite minerals are defined by IMA-CNMNC as sodium-manganese amphiboles with 0.5 apfu < A(Na+K+ 2Ca) where Na or K is dominant, and with C(Al+Fe3++2Ti)<0.5 apfu. The W position may contain (OH),F or Cl.
The hjalmarite species are defined with
A position: Na or K dominant
B position: 0.5 apfu < Na < 1.5 apfu; 0.5 apfu < (Ca+Mn2++Fe2++Mg) < 1.5 apfu; Mn2+ > other M2+ cations
C position: Mg or Fe2+ dominant
W position: (OH), F or Cl dominant
The hjalmarite species are defined with
A position: Na or K dominant
B position: 0.5 apfu < Na < 1.5 apfu; 0.5 apfu < (Ca+Mn2++Fe2++Mg) < 1.5 apfu; Mn2+ > other M2+ cations
C position: Mg or Fe2+ dominant
W position: (OH), F or Cl dominant
This page provides mineralogical data about Hjalmarite Root Name Group.
Unique Identifiers
Mindat ID:
53896
Long-form identifier:
mindat:1:1:53896:1
Chemistry of Hjalmarite Root Name Group
Mindat Formula:
A(Mn2+Na)(C5)(Si8O22)W2
The hjalmarite minerals are defined by IMA-CNMNC as sodium-manganese amphiboles with 0.5 apfu < A(Na+K+ 2Ca) where Na or K is dominant, and with C(Al+Fe3++2Ti)<0.5 apfu. The W position may contain (OH),F or Cl.
The hjalmarite species are defined with
A position: Na or K dominant
B position: 0.5 apfu < Na < 1.5 apfu; 0.5 apfu < (Ca+Mn2++Fe2++Mg) < 1.5 apfu; Mn2+ > other M2+ cations
C position: Mg or Fe2+ dominant
W position: (OH), F or Cl dominant
The hjalmarite minerals are defined by IMA-CNMNC as sodium-manganese amphiboles with 0.5 apfu < A(Na+K+ 2Ca) where Na or K is dominant, and with C(Al+Fe3++2Ti)<0.5 apfu. The W position may contain (OH),F or Cl.
The hjalmarite species are defined with
A position: Na or K dominant
B position: 0.5 apfu < Na < 1.5 apfu; 0.5 apfu < (Ca+Mn2++Fe2++Mg) < 1.5 apfu; Mn2+ > other M2+ cations
C position: Mg or Fe2+ dominant
W position: (OH), F or Cl dominant
Chemical Analysis
Oxide wt%:
| 1 | 2 | |
|---|---|---|
| SiO2 | 54.28 % | 55.37 % |
| TiO2 | 0.52 % | |
| Al2O3 | 0.23 % | 0.04 % |
| Fe2O3* | 4.42 % | |
| FeO* | 5.25 % | |
| MnO | 10.06 % | 14.04 % |
| NiO | 0.18 % | 0.01 % |
| MgO | 13.45 % | 17.84 % |
| CaO | 1.29 % | 2.80 % |
| SrO | 0.18 % | 0.06 % |
| Na2O | 6.62 % | 6.61 % |
| K2O | 1.00 % | 0.86 % |
| F | 0.32 % | 0.18 % |
| H2O (by stoichiometry) | 1.77 % | |
| -O=F | -0.13 % | |
| Cr2O3 | 0.01 % | |
| Fe2O3 | 0.10 % | |
| BaO | 0.03 % | |
| PbO | 0.27 % | |
| H2O | 2.08 % | |
| O=F | -0.07 % | |
| Total: | 99.44 % | 100.23 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Na0.57K0.19Sr0.02◻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) |
| 2 | A(Na0.84K0.16)1 B(Na1.01Mn0.55Ca0.43Sr0.01)2 C(Mg3.83Mn1.16Al0.01)5 T(Si7.99Al0.01)8O22 W(OH1.92F0.08)2 |
Sample references:
| ID | Type | Locality | Reference | Notes |
|---|---|---|---|---|
| 1 | Taguchi mine, Shitara, Kitashitara County, Aichi Prefecture, Japan | The amphibole in the sample was labeled as "richterite", but the high Mn and Fe contents indicate that the composition more appropriately falls along the hjalmarite-[ferri-ghoseite] join. The amphibole occurs abundantly in a manganiferous "amphibolite", with a rhodonite-group mineral (essentially on the composition boundary between Mn2+, Fe2+ and Mg-bearing versions of vittinkiite), some yoshimuraite, and abundant quartz, along with minor amounts of additional minerals (i.e. rhodochrosite, barian orthoclase, barite, nambulite, pyrite). The amphibole analysis is normalized to 8Si = 8, and 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 is calculated by stoichiometry. | ||
| 2 | Type Specimen | Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden | The precise composition was determined from point analyses on a polished surface using two electron probe micro-analysers (EPMA) in wavelength-dispersive (WDS) mode. In addition, polarised single-crystal FTIR-spectra in the range 2000–8000 cm1 were collected at a spectral resolution of 2 cm1 from a 35 lm thick doubly polished single-crystal fragment. . Powder X-ray diffraction data were recorded on a PANalytical X’Pert3 Powder diffractometer equipped with an X’celerator silicon-strip detectore and single-crystal X-ray study was done at room temperature using an Oxford Diffraction Xcalibur diffractor. H2O content is calculated |
Relationship of Hjalmarite Root Name Group to other Species
Member of:
Other Members of Sodium-(Magnesium-Iron-Manganese) Amphibole Subgroup:
| Ghoseite Root Name Group | ◻(Mn2+Na)(C2+4C3+)Si8O22W2 | |
| Shojiite Root Name Group | A(NaMg)(C5)(Si8O22)W2 |
Hjalmarite Root Name Group Members:
| Hjalmarite | Na(NaMn)Mg5(Si8O22)(OH)2 | Mon. 2/m : B2/m |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Hjalmarite Root Name Group
mindat.org URL:
https://www.mindat.org/min-53896.html
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References for Hjalmarite Root Name Group
Reference List:
Hawthorne, F. C., Oberti, R., Harlow, G. E., Maresch, W. V., Martin, R. F., Schumacher, J. C., Welch, M. D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist, 97 (11) 2031-2048 doi:10.2138/am.2012.4276
Localities for Hjalmarite Root Name Group
Showing 3 localities.
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Austria | |
| [Hjalmarite] Kolitsch et al. (2018) |
Japan | |
| [Hjalmarite] Frank K. Mazdab collection (from a dealer-purchased sample acquired for yoshimuraite) +1 other reference |
Sweden | |
| [Hjalmarite] Hålenius et al. (2017) +2 other references |
Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden