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Mikasaite

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Formula:
Fe2(SO4)3
System:
Trigonal
Colour:
White to light brown
Lustre:
Dull
Hardness:
2
Name:
From the type locality.
A sublimation formed from coal-gas escape; gas temperature was 307°C (Mineral. Rec. 27, 203).

A monoclinic dimorph is known as a synthetic phase.


Classification of Mikasaite

Approved
7.AB.05

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
B : With medium-sized cations
28.4.5.2

28 : ANHYDROUS ACID AND NORMAL SULFATES
4 : Miscellaneous

Physical Properties of Mikasaite

Comment:
Semitransparent
Colour:
White to light brown
Streak:
White to light brown
Hardness (Mohs):
2
Density:
3.06 g/cm3 (Calculated)

Optical Data of Mikasaite

Type:
Uniaxial (+)
RI values:
nω = 1.504() nε = 1.518(3)
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of Mikasaite

Formula:
Fe2(SO4)3
IMA Formula:
Fe23+(SO4)3
Elements listed in formula:
Common Impurities:
Mn

Crystallography of Mikasaite

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 8.14(1) Å, c = 21.99(8) Å
Ratio:
a:c = 1 : 2.701
Unit Cell Volume:
V 1,261.84 ų (Calculated from Unit Cell)
Z:
6

Type Occurrence of Mikasaite

General Appearance of Type Material:
Aggregates of porous spherical crystals.
Place of Conservation of Type Material:
Department of Geology and Mineralogy, Faculty of Science, Hokkaido University, Sapporo, Japan.
Geological Setting of Type Material:
From fracture near burning coal seam.
Empirical Formula:
Fe23+(SO4)3

Relationship of Mikasaite to other Species

7.AB.DravertiteCuMg(SO4)2
7.AB.05Millosevichite(Al,Fe)2(SO4)3
7.AB.10ChalcocyaniteCuSO4
7.AB.10ZinkositeZnSO4
7.AB.10FerrotelluriteFe(TeO4) (?)

Other Names for Mikasaite

Name in Other Languages:
German:Mikasait
Spanish:Mikasaita

Other Information

Other Information:
Deliquescent, dissolving in adsorbed water.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Mikasaite

Reference List:
Hirama, T. (1994). Mikasaite,(Fe 3+,A1)2(SO4)3, sulphate mineral from Mikasa city, Hokkaido, Japan. Mineralogical Magazine, 58, 649-653.

New Minerals (1997), New Minerals 1990-1994.

Internet Links for Mikasaite

mindat.org URL:
https://www.mindat.org/min-2709.html
Please feel free to link to this page.

Localities for Mikasaite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany
 
  • Thuringia
    • Gera
      • Ronneburg U deposit
T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
Hungary
 
  • Baranya Co.
    • Mecsek Mts
      • Pécs
Geoda 2012/I.
Japan (TL)
 
  • Hokkaido
    • Sorachi Province
      • Mikasa City
[Mineralogical Magazine(1994) 58, 649-653; MinRec 27:203]
Poland
 
  • Lower Silesia (Dolnośląskie)
    • Kłodzko District
      • Nowa Ruda (Neurode)
        • Słupiec Mine (John Mine)
Ciesielczukk, J., Kruszewski, Ł., Fabiańska, M.J., Misz-Kennan, M., Kowalski, A., Mysza, B., 2014: Efflorescences and gas composition emitted from the burning coal-waste dump in Słupiec, Lower Silesian Coal Basin, Poland. Proceedings of the International Symposium CEMC 2014, Skalský Dvůr, April 23-26th, 26-27
  • Upper Silesia (Śląskie)
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Radlin
Łukasz Kruszewski (2012) Unique chloride assemblage of exhalative origin from burning coal-mining dump in Radlin (Rybnik Coal Area, S Poland). Mineralogical Society of Poland Special Papers 40
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
Mineral and/or Locality  
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