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Chiyokoite

A valid IMA mineral species
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00042020015782351405324.jpg
Chiyokoite

Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan
00983370015781558067605.jpg
Chiyokoite

Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan
00601430015408497881802.jpg
Chiyokoite

Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan
08186100015782390189003.jpg
Chiyokoite

Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan
01807760015781496585378.jpg
Chiyokoite

Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan
05925190015408497693152.jpg
Chiyokoite

Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan
00042020015782351405324.jpg
Chiyokoite

Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan
00983370015781558067605.jpg
Chiyokoite

Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan
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About ChiyokoiteHide

06463140017070061484589.jpg
Chiyoko Henmi
Formula:
Ca3Si(CO3)[B(OH)4]O (OH)5 · 12H2O
formerly given as Ca3Si(CO3){[B(OH)4]0.5(AsO3)0.5}(OH)6.12H2O; however, the arsenate(III) anion is not a mandatory constituent
Colour:
Pink to colorless
Lustre:
Vitreous
Specific Gravity:
1.85
Crystal System:
Hexagonal
Name:
Named in honor of Chiyoko Henmi (逸見 千代子) (1949–2018), professor in the Department of Earth Science at Okayama University. She made significant contributions to the mineralogy of skarn minerals from the Fuka mine, including the discovery of eight new minerals. The mineral henmilite is also named, in part, in her honor.
Chemically somewhat similar to harkerite.



Unique IdentifiersHide

Mindat ID:
54035
Long-form identifier:
mindat:1:1:54035:5
GUID
(UUID V4):
494f74ba-c8a6-45a4-967a-f04f226db765

IMA Classification of ChiyokoiteHide

Classification of ChiyokoiteHide

Strunz-mindat (2024):
7.DG.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3

Mineral SymbolsHide

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

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

Physical Properties of ChiyokoiteHide

Lustre:
Vitreous
Transparency:
Transparent
Colour:
Pink to colorless
Streak:
White
Cleavage:
Distinct/Good
{1010} and {0001} good
Fracture:
Step-Like
Density:
1.85(1) g/cm3 (Measured)    1.85 g/cm3 (Calculated)
Comment:
Measured by flotation in heavy liquids (bromoform + dimethylformamide)

Optical Data of ChiyokoiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.523(2) nε = 1.492(3)
Max Birefringence:
δ = 0.031
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic
Comments:
Rectangular grains have straight extinction, and most of them have negative elongation. Some grains are of hexagonal shape; these are isotropic and show an interference figure perpendicular to the optical axis.

Chemistry of ChiyokoiteHide

Mindat Formula:
Ca3Si(CO3)[B(OH)4]O (OH)5 · 12H2O

formerly given as Ca3Si(CO3){[B(OH)4]0.5(AsO3)0.5}(OH)6.12H2O; however, the arsenate(III) anion is not a mandatory constituent
Elements listed:
B, C, Ca, H, O, Si - search for minerals with similar chemistry

Crystallography of ChiyokoiteHide

Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Setting:
P63
Cell Parameters:
a = 11.0119(5) Å, c = 10.5252(6) Å
Ratio:
a:c = 1 : 0.956
Unit Cell V:
1105.3 ų
Morphology:
The major forms are the hexagonal prism {1010} and monohedra {0001} and {0001}. Narrow faces of the hexagonal pyramid {h0il} are observed on some crystals.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.53 Å(100)
5.50 Å(24)
4.618 Å(11)
3.812 Å(23)
3.412 Å(15)
2.726 Å(14)
2.521 Å(19)
2.172 Å(13)

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 ChiyokoiteHide

Type Locality:
ⓘ Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan
General Appearance of Type Material:
Hexagonal prismatic crystals up to 30 µm long and up to 20 µm thick. Clusters which form friable nests up to 1 cm across.
Place of Conservation of Type Material:
collections of the (1) Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5412/1; (2) the Canadian Museum of Nature, 240 McLeod Street, Ottawa, ON K2P 2R1, Canada, catalogue number CMNMC 87294 (cotypes)
Geological Setting of Type Material:
Low-temperature hydrothermally altered, boron-bearing, low-Fe calc-silicate skarn.
Associated Minerals at Type Locality:
TacharaniteHenmiliteCalcite
Reference:
Lykova, I., Chukanov, N.V., Pekov, I.V., Yapaskurt, V.O., Pautov, L.A., Karpenko, V.Yu., Belakovskiy, D.I., Varlamov, D.A., Britvin, S.N., Scheidl, K.S. (2020) Chiyokoite, Ca3Si(CO3)[B(OH)4]O(OH)5·12H2O, a new ettringite-group mineral from the Fuka mine, Okayama Prefecture, Japan. The Canadian Mineralogist: 58(5): 653–662.

Relationship of Chiyokoite to other SpeciesHide

Member of:
Ettringite Group
Other Members of this group:
BentoriteCa6Cr2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
BuryatiteCa3(Si,Fe3+,Al)(SO4)B(OH)4(OH,O)6 · 12H2OTrig. 3m : P3 1c
CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2OHex.
CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2OTrig. 3m : P3 1c
EttringiteCa6Al2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
HielscheriteCa3Si(SO4)(SO3)(OH)6 · 11H2OHex. 6 : P63
ImayoshiiteCa3Al(CO3)[B(OH)4](OH)6 · 12H2OHex. 6 : P63
JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2OHex. 6 : P63
KottenheimiteCa 3Si(SO4)2(OH)6 · 12H2O Hex. 6/m : P63/m
Micheelsenite(Ca2Y)Al(PO3OH)(CO3)(OH)6 · 12H2OHex. 6 : P63
SiwaqaiteCa6Al2(CrO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
SturmaniteCa6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25H2OTrig. 3m : P3 1c
TatarinoviteCa3Al(SO4)[B(OH)4](OH)6 · 12H2OHex. 6 : P63
ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63
UM2008-07-CO:AlBCaHSSiCa6(Al,Si)2(CO3,SO4)2[B(OH)4](OH,O)12 · 26H2O
Unnamed (possible Mn(IV) analogue of Sturmanite)Ca6Mn4+2(SO4)2[B(OH)4](OH)10O2 · nH2O

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Chiyokoite associated with HenmiliteCa2Cu[B(OH)4]2(OH)4
2 photos of Chiyokoite associated with CalciteCaCO3

Related Minerals - Strunz-mindat GroupingHide

7.DG.MathesiusiteK5(UO2)4(SO4)4(VO5) · 4H2OTet. 4/m : P4/n
7.DG.05DarapskiteNa3(SO4)(NO3) · H2OMon. 2/m : P21/m
7.DG.10Clinoungemachite(Na, K, Fe, SO4)Mon. 2/m
7.DG.10HumberstoniteNa7K3Mg2(SO4)6(NO3)2 · 6H2OTrig. 3 : R3
7.DG.10UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2OTrig. 3 : R3
7.DG.15BentoriteCa6Cr2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
7.DG.15CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2OTrig. 3m : P3 1c
7.DG.15EttringiteCa6Al2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
7.DG.15JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2OHex. 6 : P63
7.DG.15SturmaniteCa6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25H2OTrig. 3m : P3 1c
7.DG.15ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63
7.DG.15CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2OHex.
7.DG.15BuryatiteCa3(Si,Fe3+,Al)(SO4)B(OH)4(OH,O)6 · 12H2OTrig. 3m : P3 1c
7.DG.15BiruniteCa18(SiO3)8.5(CO3)8.5SO4 · 15H2O(?)
7.DG.15HielscheriteCa3Si(SO4)(SO3)(OH)6 · 11H2OHex. 6 : P63
7.DG.15KottenheimiteCa 3Si(SO4)2(OH)6 · 12H2O Hex. 6/m : P63/m
7.DG.15ImayoshiiteCa3Al(CO3)[B(OH)4](OH)6 · 12H2OHex. 6 : P63
7.DG.15TatarinoviteCa3Al(SO4)[B(OH)4](OH)6 · 12H2OHex. 6 : P63
7.DG.15SiwaqaiteCa6Al2(CrO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
7.DG.20RapidcreekiteCa2(SO4)(CO3) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
7.DG.25TatarskiteCa6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2OOrth.
7.DG.30NakauriiteCu8(SO4)4(CO3)(OH)6 · 48H2OOrth.
7.DG.35Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2OOrth.
7.DG.40CarlosruiziteK6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2OTrig. 3m (3 2/m) : P3c1
7.DG.40FuenzalidaiteK6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2OTrig. 3m (3 2/m) : P3c1
7.DG.45Chelyabinskite(Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?)Orth.
7.DG.55Ramazzoite[Mg8Cu12(PO4)(CO3)4(OH)24(H2O)20][(H0.33SO4)3(H2O)36]Iso. 4 3m : P4 3m
7.DG.60WitzkeiteNa4K4Ca(NO3)2(SO4)4 · 2H2O Mon. 2/m : B2/b

Fluorescence of ChiyokoiteHide

In UV light:
Non fluorescent

Other InformationHide

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 ChiyokoiteHide

References for ChiyokoiteHide

Localities for ChiyokoiteHide

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.
Japan (TL)
 
  • Okayama Prefecture
    • Takahashi City
      • Bitchū
        • Fuka
Lykova et al. (2019) +1 other reference
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