Numanoite
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Formula:
Ca4Cu(B4O6(OH)6)(CO3)2
Colour:
bluish green
Lustre:
Vitreous
Hardness:
4½
Specific Gravity:
2.96
Crystal System:
Monoclinic
Name:
Named for Dr. Tadayuki Numano (1931-2001) of Okayama University.
Classification of Numanoite
Approved
Approval Year:
2005
5/H.13-20
6.DA.40
6 : BORATES
D : Tetraborates
A : Neso-tetraborates
6 : BORATES
D : Tetraborates
A : Neso-tetraborates
Physical Properties of Numanoite
Vitreous
Transparency:
Translucent
Colour:
bluish green
Comment:
Varies from quite intense to very pale, almost colorless, partly depending on thickness of the numanoite zone.
Hardness:
4½ on Mohs scale
Hardness:
VHN25=290 - 464 kg/mm2 - Vickers
Hardness Data:
Measured
Cleavage:
Perfect
{100} {110}
{100} {110}
Density:
2.96 g/cm3 (Measured) 2.96 g/cm3 (Calculated)
Optical Data of Numanoite
Type:
Biaxial (-)
RI values:
nα = 1.618(2) nβ = 1.658(2) nγ = 1.672(2)
2V:
Calculated: 60°
Max Birefringence:
δ = 0.054
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 Numanoite
Formula:
Ca4Cu(B4O6(OH)6)(CO3)2
IMA Formula:
Ca4CuB4O6(CO3)2(OH)6
Crystallography of Numanoite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 17.794 Å, b = 8.381 Å, c = 4.4494 Å
β = 102.42°
β = 102.42°
Ratio:
a:b:c = 2.123 : 1 : 0.531
Unit Cell V:
648.02 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.57 | (100) |
| 2.671 | (84) |
| 2.727 | (68) |
| 1.887 | (52) |
| 2.272 | (48) |
| 2.899 | (44) |
| 1.698 | (34) |
| ( |
Comments:
resembles borcarite pattern
Type Occurrence of Numanoite
General Appearance of Type Material:
Bluish green central zone in colorless borcarite crystals.
Place of Conservation of Type Material:
National Science Museum (Japan), specimen # M28813.
Geological Setting of Type Material:
Borate-bearing low-Fe calc-silicate skarn.
Associated Minerals at Type Locality:
Synonyms of Numanoite
Other Language Names for Numanoite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Nickel-Strunz Grouping
| 6.DA.10 | Borax | Na2(B4O5)(OH)4 · 8H2O | Mon. 2/m : B2/b |
| 6.DA.15 | Tincalconite | Na2(B4O7) · 5H2O | Trig. 3 2 : R3 2 |
| 6.DA.20 | Hungchaoite | Mg(B4O7) · 9H2O | Tric. 1 |
| 6.DA.25 | Fedorovskite | Ca2Mg2B4O7(OH)6 | Orth. mmm (2/m 2/m 2/m) : Pbam |
| 6.DA.25 | Roweite | Ca2Mn2+2B4O7(OH)6 | Orth. |
| 6.DA.30 | Hydrochlorborite | Ca4B8O15Cl2 · 21H2O | Mon. |
| 6.DA.35 | Uralborite | Ca2[B3O3(OH)5 · OB(OH)3] | Mon. |
| 6.DA.40 | Borcarite | Ca4Mg(B4O6(OH)6)(CO3)2 | Tric. |
| 6.DA.60 | Fontarnauite | (Na,K)2(Sr,Ca) (SO4)[B5O8(OH)]·2H2O | Mon. 2/m : P21/b |
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 Numanoite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ohnishi, M. et al. (2005) Kobutsu-Gakkai Koen-Yoshi (Abstract of the Meeting of the Mineralogical Society of Japan), 138.
Onishi, M. et al. (2006): Numanoite, Ca4CuB4O6(OH)6(CO3)2, a new mineral, the Cu-analogue of borcarite from the Fuka mine, Okayama Prefecture, Japan. International Mineralogical Association 19th General Meeting, Kobe, Japan, July 23-28, 2006; Conference Abstract Volume, abstract # 90144.
Ohnishi, M., Kusachi, I., Kobayashi, S., Yamakawa, J., Tanabe, M., Kishi, S., & Yasuda, T. (2007). Numanoite, Ca4CuB4O6(OH)6(CO3)2, a new mineral species, the Cu analogue of borcarite from the Fuka mine, Okayama Prefecture, Japan. The Canadian Mineralogist, 45(2), 307-315.
Internet Links for Numanoite
mindat.org URL:
https://www.mindat.org/min-29100.html
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Localities for Numanoite
symbol to view information about a locality.
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) | |
| Ohnishi, et al. (2005) Kobutsu-Gakkai Koen-Yoshi (Abstract of the Meeting of the Mineralogical Society of Japan), 138. |
Fuka mine, Fuka, Bicchu-cho, Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan