Fukalite
A valid IMA mineral species
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About Fukalite
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.
Dimorph of:
OD structure; six MDO polytypes are possible (Bonaccorsi et al., 2009).
Unique Identifiers
Mindat ID:
1619
Long-form identifier:
mindat:1:1:1619:9
GUID
(UUID V4):
(UUID V4):
2cdb62db-62e2-48d0-b4bc-2c5a814595d8
IMA Classification of Fukalite
Approved
IMA Formula:
Ca4Si2O6(CO3)(OH)2
Approval year:
1976
First published:
1977
Classification of Fukalite
9.DQ.05
9 : SILICATES (Germanates)
D : Inosilicates
Q : Modular Inosilicate-Sorosilicate Structures
9 : SILICATES (Germanates)
D : Inosilicates
Q : Modular Inosilicate-Sorosilicate Structures
78.4.3.1
78 : Unclassified Silicates
4 :
78 : Unclassified Silicates
4 :
17.4.5
17 : Silicates Containing other Anions
4 : Silicates with carbonates
17 : Silicates Containing other Anions
4 : Silicates with carbonates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Fk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Fukalite
Colour:
Pale brown, white
Streak:
White
Hardness:
4 on Mohs scale
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong
Chemistry of Fukalite
Mindat Formula:
Ca4[Si2O6][CO3](OH)2
Common Impurities:
Al,Fe,Mg,Na,K,P
Crystallography of Fukalite
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)°
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 Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0004836 | Fukalite | Merlino 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 94 323-333 | 2009 | Gumeshevsk skarn, Central Urals, Russia | 0 | 293 | |
0012514 | Fukalite | Rastsvetaeva 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 1347-1351 | 2005 | Gumeshevsk Deposit the Urals | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations |
Type Occurrence of Fukalite
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 Fukalite
Other Language Names for Fukalite
Other Information
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 Fukalite
mindat.org URL:
https://www.mindat.org/min-1619.html
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Please feel free to link to this page.
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References for Fukalite
Localities for Fukalite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Australia | |
| Bottrill |
Japan | |
| American Mineralogist |
| Bernard et al. (2004) |
| Henmi et al. (1977) |
Mexico | |
| Bernard et al. (2004) |
Romania | |
| Marincea et al. (2014, September) +1 other reference |
| Marincea et al. (2013) |
Russia | |
| American Mineralogist +1 other reference |
Turkey | |
| Armbruster et al. (2012) |
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Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan