Imayoshiite
A valid IMA mineral species
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About Imayoshiite
Formula:
Ca3Al(CO3)[B(OH)4](OH)6 · 12H2O
Colour:
Colorless
Lustre:
Vitreous, Silky
Hardness:
2 - 3
Specific Gravity:
1.79 (Calculated)
Crystal System:
Hexagonal
Member of:
Name:
Named in honour of Takaharu Imayoshi (今吉隆治) (1905 - 1984), Japanese mineral collector, who made significant contributions to mineralogy. His personal collection of ~10,000 specimens is now in the Geological Museum, Geological Survey of Japan, AIST.
Type Locality:
Imayoshiite is the first member of the ettringite group with both CO₃ and B(OH)₄ anions.
Very similar to UM2008-07-CO:AlBCaHSSi (the latter is ~identical to the carbonate-dominant analogue of charlesite).
Very similar to UM2008-07-CO:AlBCaHSSi (the latter is ~identical to the carbonate-dominant analogue of charlesite).
Unique Identifiers
Mindat ID:
44007
Long-form identifier:
mindat:1:1:44007:3
IMA Classification of Imayoshiite
Approved
IMA Formula:
Ca3Al(CO3)[B(OH)4](OH)6·12H2O
Approval year:
2013
First published:
2015
Type description reference:
Classification of Imayoshiite
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
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 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 for Standard |
|---|---|---|
| Iys | 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 Imayoshiite
Vitreous, Silky
Transparency:
Transparent
Comment:
Aggregates has a silky lustre, individuals vitreous
Colour:
Colorless
Comment:
White in aggregates
Streak:
White
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {100}
on {100}
Fracture:
Irregular/Uneven
Density:
1.79 g/cm3 (Calculated)
Optical Data of Imayoshiite
Type:
Uniaxial (-)
RI values:
nω = 1.497(2) nε = 1.470(2)
Max. Birefringence:
δ = 0.027
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Chemistry of Imayoshiite
Mindat Formula:
Ca3Al(CO3)[B(OH)4](OH)6 · 12H2O
Element Weights:
Crystallography of Imayoshiite
Crystal System:
Hexagonal
Class (H-M):
6/mmm(6/m2/m2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Setting:
P63/mmc
Cell Parameters:
a = 11.0633(6) Å, c = 10.6387(6) Å
Ratio:
a:c = 1 : 0.962
Unit Cell V:
1,127.69 ų (Calculated from Unit Cell)
Z:
2
Comment:
Data above by XRD data; Single crystal diffraction= 11.04592(2), c = 10.61502(19) Å
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.5434 Å | (100) |
| 5.5149 Å | (18) |
| 4.6364 Å | (40) |
| 3.8217 Å | (33) |
| 3.4171 Å | (16) |
| 2.7293 Å | (31) |
| 2.6506 Å | (11) |
| 2.5694 Å | (12) |
| 2.5253 Å | (69) |
| 2.1739 Å | (30) |
| 2.1198 Å | (23) |
| 1.7677 Å | (28) |
Comments:
Type material
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3b: Earth’s earliest hydrosphere | >4.45 |
| 13 : Hadean serpentinization |
Type Occurrence of Imayoshiite
General Appearance of Type Material:
Aggregates of fibrous to acicular crystals up to 2 mm across.
Place of Conservation of Type Material:
National Museum of Nature and Science, Japan, specimen number NSM, M43749 (holotype) and M43750 (cotype).
Geological Setting of Type Material:
In cavities in altered gabbro xenolith in sepentinized dunite
Associated Minerals at Type Locality:
Reference:
Synonyms of Imayoshiite
Other Language Names for Imayoshiite
Relationship of Imayoshiite to other Species
Member of:
Other Members of Ettringite Group:
| Bentorite | Ca6Cr2(SO4)3(OH)12 · 26H2O | Trig. 3m : P31c |
| Buryatite | Ca3(Si,Fe3+,Al)(SO4)B(OH)4(OH,O)6 · 12H2O | Trig. 3m : P31c |
| Carraraite | Ca3(SO4)[Ge(OH)6](CO3) · 12H2O | Hex. |
| Charlesite | Ca6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O | Trig. 3m : P31c |
| Chiyokoite | Ca3Si(CO3)[B(OH)4]O (OH)5 · 12H2O | Hex. 6 : P63 |
| Ettringite | Ca6Al2(SO4)3(OH)12 · 26H2O | Trig. 3m : P31c |
| Hielscherite | Ca3Si(SO4)(SO3)(OH)6 · 11H2O | Hex. 6 : P63 |
| Jouravskite | Ca3Mn4+(SO4)(CO3)(OH)6 · 12H2O | Hex. 6 : P63 |
| Kottenheimite | Ca 3Si(SO4)2(OH)6 · 12H2O | Hex. 6/m : P63/m |
| Micheelsenite | (Ca2Y)Al(PO3OH)(CO3)(OH)6 · 12H2O | Hex. 6 : P63 |
| Siwaqaite | Ca6Al2(CrO4)3(OH)12 · 26H2O | Trig. 3m : P31c |
| Sturmanite | Ca6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25H2O | Trig. 3m : P31c |
| Tatarinovite | Ca3Al(SO4)[B(OH)4](OH)6 · 12H2O | Hex. 6 : P63 |
| Thaumasite | Ca3(SO4)[Si(OH)6](CO3) · 12H2O | Hex. 6 : P63 |
| 'UM2008-07-CO:AlBCaHSSi' | Ca6(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 Associates
Associations Based on Photo Data:
| 27 photos of Imayoshiite associated with Datolite | CaB(SiO4)(OH) |
| 15 photos of Imayoshiite associated with Tobermorite Group | Ca4+x(AlySi6-y)O15+2x-y · 5H2O |
| 14 photos of Imayoshiite associated with Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| 7 photos of Imayoshiite associated with Calcite | CaCO3 |
| 6 photos of Imayoshiite associated with Bultfonteinite | Ca2(HSiO4)F · H2O |
| 5 photos of Imayoshiite associated with 'Bakerite' | Ca4(H5B5Si3O20) |
| 5 photos of Imayoshiite associated with Shinichengite | Ca5[BSi2O7(OH)2]2 · 6H2O |
| 3 photos of Imayoshiite associated with Andradite | Ca3Fe3+2(SiO4)3 |
| 3 photos of Imayoshiite associated with Prehnite | Ca2Al2Si3O10(OH)2 |
| 3 photos of Imayoshiite associated with Pyrite | FeS2 |
Related Minerals - Strunz-mindat Grouping
| 7.DG. | Mathesiusite | K5(UO2)4(SO4)4(VO5) · 4H2O |
| 7.DG.05 | Darapskite | Na3(SO4)(NO3) · H2O |
| 7.DG.10 | Clinoungemachite | (Na, K, Fe, SO4) |
| 7.DG.10 | Humberstonite | Na7K3Mg2(SO4)6(NO3)2 · 6H2O |
| 7.DG.10 | Ungemachite | K3Na8Fe(SO4)6(NO3)2 · 6H2O |
| 7.DG.15 | Chiyokoite | Ca3Si(CO3)[B(OH)4]O (OH)5 · 12H2O |
| 7.DG.15 | Kottenheimite | Ca 3Si(SO4)2(OH)6 · 12H2O |
| 7.DG.15 | Hielscherite | Ca3Si(SO4)(SO3)(OH)6 · 11H2O |
| 7.DG.15 | Jouravskite | Ca3Mn4+(SO4)(CO3)(OH)6 · 12H2O |
| 7.DG.15 | Thaumasite | Ca3(SO4)[Si(OH)6](CO3) · 12H2O |
| 7.DG.15 | Bentorite | Ca6Cr2(SO4)3(OH)12 · 26H2O |
| 7.DG.15 | Carraraite | Ca3(SO4)[Ge(OH)6](CO3) · 12H2O |
| 7.DG.15 | Ettringite | Ca6Al2(SO4)3(OH)12 · 26H2O |
| 7.DG.15 | Birunite | Ca18(SiO3)8.5(CO3)8.5SO4 · 15H2O(?) |
| 7.DG.15 | Siwaqaite | Ca6Al2(CrO4)3(OH)12 · 26H2O |
| 7.DG.15 | Buryatite | Ca3(Si,Fe3+,Al)(SO4)B(OH)4(OH,O)6 · 12H2O |
| 7.DG.15 | Charlesite | Ca6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O |
| 7.DG.15 | Tatarinovite | Ca3Al(SO4)[B(OH)4](OH)6 · 12H2O |
| 7.DG.15 | Sturmanite | Ca6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25H2O |
| 7.DG.20 | Rapidcreekite | Ca2(SO4)(CO3) · 4H2O |
| 7.DG.25 | Tatarskite | Ca6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2O |
| 7.DG.30 | Nakauriite | Cu8(SO4)4(CO3)(OH)6 · 48H2O |
| 7.DG.35 | Chessexite | (Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2O |
| 7.DG.40 | Fuenzalidaite | K6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2O |
| 7.DG.40 | Carlosruizite | K6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2O |
| 7.DG.45 | 'Chelyabinskite' | (Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?) |
| 7.DG.55 | Ramazzoite | [Mg8Cu12(PO4)(CO3)4(OH)24(H2O)20][(H0.33SO4)3(H2O)36] |
| 7.DG.60 | Witzkeite | Na4K4Ca(NO3)2(SO4)4 · 2H2O |
Fluorescence of Imayoshiite
No fluorescence under SW or LW UV
Other Information
IR Spectrum:
Absorption bands at 3600 and 3420 cm-1 due to O-H stretching vibrations, at 1678 cm-1 due to H-O-H bending vibrations, at 1417 and 882 cm-1 due to the vibrations of the carbonate group and at 1207 cm-1 due to the vibrations of B(OH)4 tetrahedra.
Thermal Behaviour:
The DTA curve has a strong endothermic peak at 120ºC corresponding to loss of water. The weight loss was 50.02% from room temperature to 500ºC.
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 Imayoshiite
mindat.org URL:
https://www.mindat.org/min-44007.html
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Please feel free to link to this page.
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References for Imayoshiite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) New minerals and nomenclature modifications approved in 2013. CNMNC Newsletter No 18. Mineralogical Magazine, 77 (8) 3249-3258 doi:10.1180/minmag.2013.077.8.15
Localities for Imayoshiite
Showing 2 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
China | |
| Desor (02/2021) +2 other references |
Japan (TL) | |
| Williams et al. (2013) +1 other reference |
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Shijiangshan mine, Hexigten Banner, Chifeng City, Inner Mongolia, China