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Mikasaite

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Ikushunbetsu, Mikasa City, Sorachi Province, Hokkaido, Japan
© 2008, JGW




Formula:
Fe
 
2
(SO
 
4
)
 
3
System:TrigonalColour:White to light brown
Lustre:DullHardness: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

IMA status:Approved
Strunz 8th edition ID:6/A.02-20
Nickel-Strunz 10th (pending) edition ID:7.AB.05

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
B : With medium-sized cations
Dana 8th edition ID:28.4.5.2

28 : ANHYDROUS ACID AND NORMAL SULFATES
4 : Miscellaneous
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Type Occurrence of Mikasaite

Type Locality:Ikushunbetsu, Mikasa City, Sorachi Province, Hokkaido, Japan
General Appearance of Type Material:Aggregates of porous spherical crystals.
Year of Discovery:1994
Geological Setting of type material:From fracture near burning coal seam.

Physical Properties of Mikasaite

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

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
Comment:On synthetic material

Optical Data of Mikasaite

Type:Uniaxial (+)
RI values: nω = 1.504() nε = 1.518(3)
Maximum Birefringence:δ = 0.014

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Mikasaite

Formula:
Fe
 
2
(SO
 
4
)
 
3
Essential elements:Fe, O, S
All elements listed in formula:Fe, O, S
Empirical Formula:
Fe
3+
2
(SO
 
4
)
 
3
Common Impurities:Mn

Relationship of Mikasaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.AB.05Millosevichite
(Al,Fe)
 
2
(SO
 
4
)
 
3
7.AB.10Chalcocyanite
CuSO
 
4
7.AB.10Zinkosite
ZnSO
 
4
7.AB.10Ferrotellurite
Fe(TeO
 
4
) (?)

Other Names for Mikasaite

Synonyms:
IMA1992-015
Other Languages:
German:Mikasait
Spanish:Mikasaita

Other Information

Other Information:Deliquescent, dissolving in adsorbed water.
Health Warning: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:

- +
Mineralogical Magazine (1994): 58: 649-653

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

Internet Links for Mikasaite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mikasaite details from Handbook of Mineralogy (PDF)
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    • Localities for Mikasaite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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
     
    • Hokkaido
      • Sorachi Province
        • Mikasa City
    		[Min.Mag.(1994) 58, 649-653; MinRec 27:203]
    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).
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