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Fukalite

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Formula:
Ca4Si2O6(CO3)(OH)2
System:
Monoclinic
Colour:
pale brown, white
Hardness:
4
Name:
Named by Chiyoko Henmi, Isao Kusachi, Akira Kawahara, and Kitinosuke Henmi in 1997 after the type locality of Fuka Mine, Japan.
OD structure; six MDO polytypes are possible (Bonaccorsi et al., 2009).

See also Unnamed (Fukalite Dimorph).


Classification of Fukalite

Approved
Approval Year:
1976
First Published:
1977
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

Physical Properties of Fukalite

Colour:
pale brown, white
Streak:
white
Hardness (Mohs):
4
Density:
2.770 g/cm3 (Measured)    2.77 g/cm3 (Calculated)

Optical Data of Fukalite

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

Chemical Properties of Fukalite

IMA Formula:
Ca4Si2O6(CO3)(OH)2
Elements listed in formula:
Common Impurities:
Al,Fe,Mg,Na,K,P

Crystallography of Fukalite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group 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 Volume:
V 1,929.52 ų (Calculated from Unit Cell)
Comment:
Cell conforms to one of six possible MDO types. Originally described with orthrhombic cell (5.48, 3.78, 23.42 A).

Type Occurrence of Fukalite

Associated Minerals at Type Locality:

Relationship of Fukalite to other Species

17.4.1TilleyiteCa5Si2O7(CO3)2
17.4.2SpurriteCa5(SiO4)2(CO3)
17.4.3ParaspurriteCa5(SiO4)2(CO3)
17.4.4ScawtiteCa7(Si3O9)2(CO3) · 2H2O
17.4.6Meionite(Ca,Na)4(Si,Al)12O24(CO3,SO4,Cl)
17.4.7Cancrinite(Na,Ca,◻)8(Al6Si6)O24(CO3,SO4)2 · 2H2O
17.4.8CarletoniteKNa4Ca4Si8O18(CO3)4(F,OH) · H2O
17.4.9Iimoriite-(Y)Y2(SiO4)(CO3)
17.4.10Kainosite-(Y)Ca2Y2(SiO3)4(CO3) · H2O
17.4.11Caysichite-(Y)(Ca,Yb,Er)4Y4Si8O20(CO3)6(OH) · 7H2O
17.4.12Lepersonnite-(Gd)CaGd2(UO2)24(CO3)8Si4O28 · 60H2O
17.4.13AshburtoniteHPb4Cu4(Si4O12)(HCO3)4(OH)4Cl
17.4.14Surite(Pb,Ca)3Al2(Si,Al)4O10(CO3)2(OH)3 · 0.3H2O
17.4.15Tundrite-(Ce)Na2Ce2TiO2SiO4(CO3)2
17.4.16Tundrite-(Nd)Na2Nd2TiO2(SiO4)(CO3)2

Other Names for Fukalite

Name in Other Languages:

Other Information

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 Fukalite

Reference List:
Mineralogical Journal of Japan (1977): 8, 374-381.

American Mineralogist: 63: 793.

Bonaccorsi, E., Merlino, S., Grabezhev, A.I., Zadov, A.E., Pertsev, N.N., Chukanov, N.V. (2009): Fukalite: an example of OD structure with two-dimensional disorder. American Mineralogist, 94, 323-333.

Internet Links for Fukalite

mindat.org URL:
https://www.mindat.org/min-1619.html
Please feel free to link to this page.

Localities for Fukalite

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.
Australia
 
  • Tasmania
    • Huon Valley municipality
      • Huon-Channel region
        • Weld River district
Bottrill, MRT collection
Japan
 
  • Honshu Island
    • Chugoku Region
      • Hiroshima prefecture
        • Hiba-gun
American Mineralogist, Volume 94, pages 323–333, 2009
      • Okayama Prefecture
        • Ihara City (Ibara City)
          • Higashi-Mihara
Jan Bernard & Jaroslav Hyrsl (2004) Minerals and their Localities, p. 235
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
Mineralogical Journal of Japan (1977): 8, 374-381.
Mexico
 
  • Michoacan
    • Mun. de Zitacuaro
Bernard, J.H. and Hyrsl, J. (2004) Minerals and their Localities. (Granit, Prague)
Romania
 
  • Hunedoara Co.
    • Hunedoara
Marincea, Ş., Dumitraş, D. G., Călin, N., Anason, A. M., Fransolet, A. M., & Hatert, F. (2013). Spurrite, tilleyite and associated minerals in the exoskarn zone from Cornet Hill (Metaliferi Massif, Apuseni Mountains, Romania). The Canadian Mineralogist, 51(3), 359-375.
Russia
 
  • Urals Region
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Sysert' District
          • Polevskoi (Polevskoi Zavod)
American Mineralogist, Volume 94, pages 323–333, 2009; Grabezhev, A. I., Pertsev, N. N., Zadov, A. E., Pribavkin, S. V., & Murzin, V. V. (2007). Calcic hydrosilicate metasomatic rocks at the Gumeshevsk skarn-porphyry copper deposit in the central Urals, Russia. Petrology, 15(5), 514-522.
Mineral and/or Locality  
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