Minamiite Mineral Data

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General Minamiite Information

Chemical Formula:

(Na,Ca,K)Al3(SO4)2(OH)6

Composition:

Molecular Weight = 404.84 gm

Potassium 0.97 % K 1.16 % K₂O

Sodium 3.41 % Na 4.59 % Na₂O

Calcium 2.97 % Ca 4.16 % CaO

Aluminum 19.99 % Al 37.78 % Al₂O₃

Hydrogen 1.49 % H 13.35 % H₂O

Sulfur 15.84 % S 39.55 % SO₃

Oxygen 55.33 % O

______ ______

100.00 % 100.59 % = TOTAL OXIDE

Empirical Formula:

Na_0.6Ca_0.3K_0.1Al₃(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

PDF 34-143

Minamiite Image

Images:

Minamiite

Comments: White granular powdery minamiite aggregate.
Location: Okumanza, Gumma, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Minamiite Crystallography

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 ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.959(1), 4.901(0.92), 2.975(0.47),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Ossaka J , Hirabayashi J , Okada K , Kobayashi R , Hayashi T , American Mineralogist , 67 (1982) p.114-119, Crystal structure of minamiite, a new mineral of the alunite group

Physical Properties of Minamiite

Color:

White.

Density:

2.8

Diaphaneity:

Transparent to Translucent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Minamiite

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

Calculated Properties of Minamiite

Electron Density:

Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Minamiite =2.85 gm/cc.

Fermion Index:

Fermion Index = 0.0014971581
Boson Index = 0.9985028419

Photoelectric:

PE_Minamiite= 2.08 barns/electron
U=PE_Minamiite x r_electron= 5.96 barns/cc.

Radioactivity:

GRapi = 14.03 (Gamma Ray American Petroleum Institute Units)
Concentration of Minamiite per GRapi unit = 7.13 (%)

Estimated Radioactivity from Minamiite - barely detectable

Minamiite Classification

Dana Class:

30.02.04.05 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.02)where (A B)2 XO4 Zq

(30.02.04)Alunite Group (Alunite Subgroup)

30.02.04.01 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig

30.02.04.02 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m

30.02.04.03 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m

30.02.04.04 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m

30.02.04.05 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m

30.02.04.06 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m

30.02.04.07 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m

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)

07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O

07.BC -With medium-sized and large cations

07.BC.10 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig

07.BC.10 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Ammoniojarosite (NH4)Fe3(SO4)2(OH)6 R 3m 3m

07.BC.10 Beaverite PbCu(Fe,Al)2(SO4)2(OH)6 R 3m 3m

07.BC.10 Argentojarosite AgFe3(SO4)2(OH)6 R 3m 3m

07.BC.10 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Dorallcharite (Tl,K)Fe3(SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Jarosite KFe3(SO4)2(OH)6 R 3 3

07.BC.10 Hydroniumjarosite (H3O)Fe3(SO4)2(OH)6 R 3m 3m

07.BC.10 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Natrojarosite NaFe3(SO4)2(OH)6 R 3m 3m

07.BC.10 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m

07.BC.10 Plumbojarosite PbFe6(SO4)4(OH)12 R 3m 3 2/m

07.BC.10 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m

07.BC.10 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m

Other Minamiite Information

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

Search for Minamiite using:

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Ask about Minamiite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Minamiite Specimen Label here :

Minamiite

(Na,Ca,K)Al3(SO4)2(OH)6
Dana No: 30.02.04.05 Strunz No: 07.BC.10
Locality:

Notes: