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Fukalite

A valid IMA mineral species
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About FukaliteHide

Formula:
Ca4[Si2O6][CO3](OH)2
Colour:
Pale brown, white
Hardness:
4
Specific Gravity:
2.770
Crystal System:
Monoclinic
Name:
Named by Chiyoko Henmi, Isao Kusachi, Akira Kawahara, and Kitinosuke Henmi in 1977 after the type locality of Fuka Mine, Japan.
OD structure; six MDO polytypes are possible (Bonaccorsi et al., 2009).


Unique IdentifiersHide

Mindat ID:
1619
Long-form identifier:
mindat:1:1:1619:9
GUID
(UUID V4):
2cdb62db-62e2-48d0-b4bc-2c5a814595d8

IMA Classification of FukaliteHide

Classification of FukaliteHide

9.DQ.05

9 : SILICATES (Germanates)
D : Inosilicates
Q : Modular Inosilicate-Sorosilicate Structures
78.4.3.1

78 : Unclassified Silicates
4 :
17.4.5

17 : Silicates Containing other Anions
4 : Silicates with carbonates

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
FkIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of FukaliteHide

Colour:
Pale brown, white
Streak:
White
Hardness:
Density:
2.770 g/cm3 (Measured)    2.77 g/cm3 (Calculated)

Optical Data of FukaliteHide

Type:
Biaxial (+/-)
RI values:
nα = 1.595 nβ = 1.605 nγ = 1.626
2V:
Measured: 90° , Calculated: 70°
Max Birefringence:
δ = 0.031
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong

Chemistry of FukaliteHide

Mindat Formula:
Ca4[Si2O6][CO3](OH)2
Common Impurities:
Al,Fe,Mg,Na,K,P

Crystallography of FukaliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P1 21/c 1
Cell Parameters:
a = 7.573(3) Å, b = 23.364(5) Å, c = 11.544(4) Å
β = 109.15(1)°
Ratio:
a:b:c = 0.324 : 1 : 0.494
Unit Cell V:
1,929.52 ų (Calculated from Unit Cell)
Z:
2
Comment:
Cell conforms to one of six possible MDO types. Originally described with orthrhombic cell (5.48, 3.78, 23.42 A).

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0004836FukaliteMerlino S, Bonaccorsi E, Grabezhev A I, Zadov A E, Pertsev N N, Chukanov N V (2009) Fukalite: An example of an OD structure with two-dimensional disorder American Mineralogist 94 323-3332009Gumeshevsk skarn, Central Urals, Russia0293
0012514FukaliteRastsvetaeva R K, Bolotina N B, Zadov A E, Chukanov N V (2005) Crystal structure of fukalite dimorph Ca4[Si2O6](CO3)(OH)2 from the Gumeshevsk Deposit the Urals Doklady Earth Sciences 405A 1347-13512005Gumeshevsk Deposit the Urals0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.854 Å(100)
3.084 Å(90)
2.926 Å(65)
2.338 Å(30)
1.756 Å(30b)
5.86 Å(25)
3.904 Å(20)
Comments:
Fuka, Japan. Data from the type description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
31 : Thermally altered carbonate, phosphate, and iron formations

Type Occurrence of FukaliteHide

General Appearance of Type Material:
Flaky crystals to 0.2 mm.
Place of Conservation of Type Material:
Department of Earth Sciences, Okayama University.
Geological Setting of Type Material:
Alteration product of spurrite.
Associated Minerals at Type Locality:
Reference:
Henmi, C., Kusachi, I., Kawahara, A., Henmi, K. (1977) Fukalite, a new calcium carbonate silicate hydrate mineral. Mineralogical Journal: 8: 374-381.

Synonyms of FukaliteHide

Other Language Names for FukaliteHide

Other InformationHide

Notes:
Decomposed by acids with effervescence.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for FukaliteHide

References for FukaliteHide

Localities for FukaliteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia
 
  • Tasmania
    • Huon Valley municipality
      • Huon-Channel region
        • Weld River district
Bottrill
Japan
 
  • Hiroshima Prefecture
    • Shoubara City
American Mineralogist
  • Okayama Prefecture
    • Ibara City
      • Higashi-Mihara
Bernard et al. (2004)
    • Takahashi City
      • Bitchū
        • Fuka
Henmi et al. (1977)
Mexico
 
  • Michoacan
    • Zitacuaro Municipality
Bernard et al. (2004)
Romania
 
  • Caraş-Severin County
    • Prigor
Marincea et al. (2014, September) +1 other reference
  • Hunedoara County
Marincea et al. (2013)
Russia
 
  • Sverdlovsk Oblast
    • Polevskoy
American Mineralogist +1 other reference
Turkey
 
  • Rize Province
Armbruster et al. (2012)
 
矿物 and/or 产地  
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