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Minamiite Mineral Data
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General Minamiite Information
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 Chemical Formula: |
(Na,Ca,K)Al3(SO4)2(OH)6 |
| Composition: |
Molecular Weight = 404.84 gm |
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Potassium 0.97 % K 1.16 % K2O |
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Sodium 3.41 % Na 4.59 % Na2O |
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Calcium 2.97 % Ca 4.16 % CaO |
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Aluminum 19.99 % Al 37.78 % Al2O3 |
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Hydrogen 1.49 % H 13.35 % H2O |
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Sulfur 15.84 % S 39.55 % SO3 |
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Oxygen 55.33 % O |
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______ ______ |
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100.00 % 100.59 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.6Ca0.3K0.1Al3(SO4)2(OH)6 |
| Environment: |
Hydrothermally altered labradorite andesite. |
| IMA Status: |
Approved IMA 1982 |
| Locality: |
Okumanza, near the Kusatsu-Shirane volcano, Gumma Prefecture, Japan. Link to MinDat.org Location Data. |
| Name Origin: |
Named for A.E. Minami (1899-1977), who studied the hot springs around the Kusatsu-Shirane volcano, Japan. |
| Name Pronunciation: |
Minamiite + Pronunciation  |
| Synonym: |
ICSD 17051 |
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PDF 34-143 |
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Minamiite Image |
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Images:
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Minamiite Crystallography
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| Axial Ratios: |
a:c = 1:4.7973 |
| Cell Dimensions: |
a = 6.981, c = 33.49, Z = 6; V = 1,413.45 Den(Calc)= 2.85 |
| Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.959(1), 4.901(0.92), 2.975(0.47), |
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Physical Properties of Minamiite
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| Color: |
White. |
| Density: |
2.8 |
| Diaphaneity: |
Transparent to Translucent |
| Hardness: |
3-4 - Calcite-Fluorite |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties of Minamiite
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| Optical Data: |
NCalc= 1.61 - from Gladstone-Dale relationship (KC = 0.2133) where Ncalc=Dcalc*KC+1
NCalc= 1.6 - from Gladstone-Dale relationship (KC = 0.2133) where Ncalc=Dmeas*KC+1
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Calculated Properties of Minamiite
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| Electron Density: |
Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Minamiite =2.85 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0014971581
Boson Index = 0.9985028419 |
| Photoelectric: |
PEMinamiite = 2.08 barns/electron
U=PEMinamiite x relectron= 5.96 barns/cc.
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| Radioactivity: |
GRapi = 14.03 (Gamma Ray American Petroleum Institute Units)
Concentration of Minamiite per GRapi unit = 7.13 (%)
Estimated Radioactivity from Minamiite  - barely detectable
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Minamiite Classification
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| Dana Class: |
30.02.04.05 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen |
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(30.02)where (A B)2 XO4 Zq |
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(30.02.04)Alunite Group (Alunite Subgroup) |
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30.02.04.01 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig |
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30.02.04.02 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m |
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30.02.04.03 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m |
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30.02.04.04 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m |
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30.02.04.05 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m |
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30.02.04.06 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m |
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30.02.04.07 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m |
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30.02.04.08 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m |
| Strunz Class: |
07.BC.10 07 - SULFATES (SELENATES, TELLURATES) |
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07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O |
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07.BC -With medium-sized and large cations |
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07.BC.10 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig |
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07.BC.10 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m |
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07.BC.10 Ammoniojarosite (NH4)Fe3(SO4)2(OH)6 R 3m 3m |
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07.BC.10 Beaverite PbCu(Fe,Al)2(SO4)2(OH)6 R 3m 3m |
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07.BC.10 Argentojarosite AgFe3(SO4)2(OH)6 R 3m 3m |
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07.BC.10 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m |
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07.BC.10 Dorallcharite (Tl,K)Fe3(SO4)2(OH)6 R 3m 3 2/m |
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07.BC.10 Jarosite KFe3(SO4)2(OH)6 R 3 3 |
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07.BC.10 Hydroniumjarosite (H3O)Fe3(SO4)2(OH)6 R 3m 3m |
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07.BC.10 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m |
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07.BC.10 Natrojarosite NaFe3(SO4)2(OH)6 R 3m 3m |
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07.BC.10 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m |
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07.BC.10 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m |
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07.BC.10 Plumbojarosite PbFe6(SO4)4(OH)12 R 3m 3 2/m |
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07.BC.10 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m |
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07.BC.10 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m |
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Other Minamiite Information
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| References: |
NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
| See Also: |
Links to other databases for Minamiite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Minamiite
(Na,Ca,K)Al3(SO4)2(OH)6
Dana No: 30.02.04.05 Strunz No: 07.BC.10
Locality:
Notes:
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