Minamiite Mineral Data

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

IMA Status:

Approved IMA 1982

Locality:

Link to MinDat.org Location Data.

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:

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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

Diaphaniety:

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:

r_electron=2.87 gm/cc
note: r_Minamiite=2.85 gm/cc.

Fermion Index

Fermion Index = 0.00149
Boson Index = 0.99851

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)

Estimated Radioactivity from Minamiite - barely detectable

Minamiite Classification

Dana Class:

30.2.4.5 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.2)where (A B)2 XO4 Zq

(30.2.4)Alunite Group (Alunite Subgroup)

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

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

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

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

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

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

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

30.2.4.8 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m

Strunz Class:

VI/B.11-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. mostly big cations

VI/B.11 - Alunite group, Natroalunite - Jarosite - Beaverite

VI/B.11-10 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-20 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig

VI/B.11-30 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-40 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-43 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-45 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-50 Natrojarosite NaFe3(SO4)2(OH)6 R 3m 3m

VI/B.11-60 Jarosite KFe3(SO4)2(OH)6 R 3 3

VI/B.11-65 Dorallcharite (Tl,K)Fe3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-70 Ammoniojarosite (NH4)Fe3(SO4)2(OH)6 R 3m 3m

VI/B.11-80 Hydronium-jarosite (H3O)Fe3(SO4)2(OH)6 R 3m 3m

VI/B.11-90 Argentojarosite AgFe3(SO4)2(OH)6 R 3m 3m

VI/B.11-100 Plumbojarosite PbFe6(SO4)4(OH)12 R 3m 3 2/m

VI/B.11-110 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m

VI/B.11-120 Beaverite PbCu(Fe,Al)2(SO4)2(OH)6 R 3m 3m

Other Minamiite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Minamiite

(Na,Ca,K)Al3(SO4)2(OH)6
Dana No: 30.2.4.5 Strunz No: VI/B.11-40
Locality:

Notes: