Imayoshiite
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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 honor 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.
Classification of Imayoshiite
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() nε = 1.470(2)
Max Birefringence:
δ = 0.027
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
Chemical Properties of Imayoshiite
Formula:
Ca3Al(CO3)[B(OH)4](OH)6 · 12H2O
Crystallography of Imayoshiite
Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Cell Parameters:
a = 11.0264(11) Å, c = 10.6052(16) Å
Ratio:
a:c = 1 : 0.962
Unit Cell V:
1,116.65 ų (Calculated from Unit Cell)
Comment:
Data above by XRD data; Single crystal diffraction= 11.04592(2), c = 10.61502(19) Å
Type Occurrence of Imayoshiite
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
Reference:
Nishio-Hamane, D., Ohnishi, M., Momma, K., Shimobayashi, N., Miyawaki, R., Minakawa, T., Inaba, S. (2015) Imayoshiite, Ca3Al(CO3)[B(OH)4](OH)6·12H2O, a new mineral of the ettringite group from Ise City, Mie Prefecture, Japan. Mineralogical Magazine: 79: 413-423.
Synonyms of Imayoshiite
Other Language Names for Imayoshiite
Japanese:今吉石
Relationship of Imayoshiite to other Species
Member of:
Other Members of this group:
| Bentorite | Ca6(Cr3+,Al)2(SO4)3(OH)12 · 26H2O | Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc |
| Buryatite | Ca3(Si,Fe,Al)(SO4)[B(OH)4]O(OH)5 · 12H2O | |
| 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 : P3 1c |
| Ettringite | Ca6Al2(SO4)3(OH)12 · 26H2O | Trig. 3m : P3 1c |
| Hielscherite | Ca3Si(SO4)(SO3)(OH)6 · 11H2O | Hex. 6 : P63 |
| Jouravskite | Ca3Mn4+(SO4)(CO3)(OH)6 · 12H2O | Hex. |
| Kottenheimite | Ca 3Si(SO4)2(OH)6·12H2O | Hex. 6/m : P63/m |
| Micheelsenite | (Ca,Y)3Al(HPO4,CO3)(CO3)(OH)6 · 12H2O | Hex. |
| Sturmanite | Ca6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2O | Trig. 3m : P3 1c |
| Tatarinovite | Са3Al(SO4)[B(OH)4](OH)6·12H2O | Hex. 6 : P63 |
| Thaumasite | Ca3(SO4)[Si(OH)6](CO3) · 12H2O | Hex. 6 : P63 |
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 Imayoshiite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nishio-Hamane, D., Ohnishi, M., Momma, K., Shimobayashi, N., Miyawaki, R., Minakawa, T. and Inaba, S. (2013) Imayoshiite, IMA 2013-069. CNMNC Newsletter No. 18, December 2013, page 3251. Mineralogical Magazine: 77: 3249-3258.
Nishio-Hamane, D., Ohnishi, M., Momma, K., Shimobayashi, N., Miyawaki, R., Minakawa, T., Inaba, S. (2015) Imayoshiite, Ca3Al(CO3)[B(OH)4](OH)6·12H2O, a new mineral of the ettringite group from Ise City, Mie Prefecture, Japan. Mineralogical Magazine: 79: 413-423.
Internet Links for Imayoshiite
mindat.org URL:
https://www.mindat.org/min-44007.html
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Localities for Imayoshiite
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The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for 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.
Japan (TL) | |
| Nishio-Hamane, D., Ohnishi, M., Momma, K., Shimobayashi, N., Miyawaki, R., Minakawa, T. and Inaba, S. (2013) Imayoshiite, IMA 2013-069. CNMNC Newsletter No. 18, December 2013, page 3251; Nishio-Hamane, D., Ohnishi, M., Momma, K., Shimobayashi, N., Miyawaki, R., Minakawa, T., Inaba, S. (2015): Imayoshiite, Ca3Al(CO3)[B(OH)4](OH)6·12H2O, a new mineral of the ettringite group from Ise City, Mie Prefecture, Japan. Mineralogical Magazine, 79, 413-423. |
Suisho-dani, Ise City, Mie, Japan