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Imayoshiite

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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
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.
Imayoshiite is the first member of the ettringite group with both CO3 and B(OH)4 anions.


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Classification of ImayoshiiteHide

Approved
Approval Year:
2013
First Published:
2015

Physical Properties of ImayoshiiteHide

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}
Fracture:
Irregular/Uneven
Density:
1.79 g/cm3 (Calculated)

Optical Data of ImayoshiiteHide

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.
Surface Relief:
Moderate

Chemical Properties of ImayoshiiteHide

Formula:
Ca3Al(CO3)[B(OH)4](OH)6 · 12H2O

Crystallography of ImayoshiiteHide

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 ImayoshiiteHide

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 ImayoshiiteHide

Other Language Names for ImayoshiiteHide

Japanese:今吉石

Relationship of Imayoshiite to other SpeciesHide

Other Members of this group:
BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
BuryatiteCa3(Si,Fe,Al)(SO4)[B(OH)4]O(OH)5 · 12H2O
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
JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2OHex.
KottenheimiteCa 3Si(SO4)2(OH)6·12H2O Hex. 6/m : P63/m
Micheelsenite(Ca,Y)3Al(HPO4,CO3)(CO3)(OH)6 · 12H2OHex.
SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2OTrig. 3m : P3 1c
TatarinoviteСа3Al(SO4)[B(OH)4](OH)6·12H2OHex. 6 : P63
ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63

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.

References for ImayoshiiteHide

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 ImayoshiiteHide

Localities for ImayoshiiteHide

ⓘ - 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). 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Japan (TL)
 
  • Honshu Island
    • Kinki region
      • Mie Prefecture
        • Ise City
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.
Mineral and/or Locality  
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