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Fukalite

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Fuka mine, Bitchu-cho-fuka (Bicchu-cho-fuka), Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan
© [email protected]




Formula:
Ca
 
4
[Si
 
2
O
 
6
][CO
 
3
](OH)
 
2
System:MonoclinicColour:pale brown, white
Hardness:4
Name:Named after its discovery locality.


OD structure; six MDO polytypes are possible (Bonaccorsi et al., 2009).

See also Unnamed (Fukalite Dimorph).

Classification of Fukalite

IMA status:Approved 1976
Strunz 8th edition ID:8/B.22-80
Nickel-Strunz 10th (pending) edition ID:9.DQ.05

9 : SILICATES (Germanates)
D : Inosilicates
Q : Modular Inosilicate-Sorosilicate Structures
Dana 8th edition ID:78.4.3.1

78 : Unclassified Silicates
4 :
Hey's CIM Ref.:17.4.5

17 : Silicates Containing other Anions
4 : Silicates with carbonates
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Type Occurrence of Fukalite

Type Locality:Fuka mine, Bitchu-cho-fuka (Bicchu-cho-fuka), Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan
Year of Discovery:1976

Physical Properties of Fukalite

Colour:pale brown, white
Streak:white
Hardness (Mohs):4

Crystallography of Fukalite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
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).

Optical Data of Fukalite

Type:Biaxial (+/-)
RI values: nα = 1.595 nβ = 1.605 nγ = 1.626
2V:Measured: 90° , Calculated: 70°
Maximum Birefringence:δ = 0.031

Chart 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

Formula:
Ca
 
4
[Si
 
2
O
 
6
][CO
 
3
](OH)
 
2
Simplified for copy/paste:Ca4[Si2O6][CO3](OH)2
Essential elements:C, Ca, H, O, Si
All elements listed in formula:C, Ca, H, O, Si
Common Impurities:Al,Fe,Mg,Na,K,P

Relationship of Fukalite to other Species

Related Minerals - Hey's Index Grouping:

- +
17.4.1Tilleyite
Ca
 
5
(Si
 
2
O
 
7
)(CO
 
3
)
 
2
17.4.2Spurrite
Ca
 
5
(SiO
 
4
)
 
2
(CO
 
3
)
17.4.3Paraspurrite
17.4.4Scawtite
Ca
 
7
(Si
 
3
O
 
9
)
 
2
CO
 
3
· 2H
 
2
O
17.4.6Meionite
Ca
 
4
Al
 
6
Si
 
6
O
 
24
CO
 
3
17.4.7Cancrinite
(Na,Ca,☐)
 
8
(Al
 
6
Si
 
6
O
 
24
)(CO
 
3
,SO
 
4
)
 
2
· 2H
 
2
O
17.4.8Carletonite
KNa
 
4
Ca
 
4
Si
 
8
O
 
18
(CO
 
3
)
 
4
(OH,F) · H
 
2
O
17.4.9Iimoriite-(Y)
Y
 
2
[SiO
 
4
][CO
 
3
]
17.4.10Kainosite-(Y)
Ca
 
2
(Y,Ce)
 
2
(Si
 
4
O
 
12
)(CO
 
3
) · H
 
2
O
17.4.11Caysichite-(Y)
Ca
 
2
Y
 
2
Si
 
4
O
 
10
(CO
 
3
)
 
3
· 4H
 
2
O
17.4.12Lepersonnite-(Gd)
Ca(Gd,Dy)
 
2
(UO
 
2
)
 
24
(SiO
 
4
)
 
4
(CO
 
3
)
 
8
(OH)
 
24
· 48H
 
2
O
17.4.13Ashburtonite
Pb
 
4
Cu
 
4
(Si
 
4
O
 
12
)(HCO
 
3
)
 
4
(OH)
 
3
Cl · H
 
2
O
17.4.14Surite
(Pb,Ca)
 
3
(Al,Fe
2+
 
,Mg)
 
2
((Si,Al)
 
4
O
 
10
)(CO
 
3
)
 
2
(OH)
 
2
17.4.15Tundrite-(Ce)
Na
 
2
Ce
 
2
Ti(SiO
 
4
)(CO
 
3
)
 
2
O
 
2
17.4.16Tundrite-(Nd)
Na
 
3
(Nd,La)
 
4
(Ti,Nb)
 
2
(SiO
 
4
)
 
2
(CO
 
3
)
 
3
O
 
4
(OH) · 2H
 
2
O

Other Names for Fukalite

Synonyms:
IMA1976-003
Other Languages:
German:Fukalit
Fukalith
Spanish:Fukalita

Other Information

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 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

Search Engines:
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  • Raman and XRD data at RRUFF project
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  • Fukalite details from Handbook of Mineralogy (PDF)
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  • Localities for Fukalite

    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.
    (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.
    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
            • Bitchu-cho-fuka (Bicchu-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)
    Russia
     
    • Urals Region
      • Middle Urals
        • Sverdlovskaya Oblast'
          • Sysert' District
            • Polevskoi (Polevskoi Zavod)
    American Mineralogist, Volume 94, pages 323–333, 2009
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