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Numanoite

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About NumanoiteHide

Formula:
Ca4Cu(B4O6(OH)6)(CO3)2
Colour:
bluish green
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.96
Crystal System:
Monoclinic
Name:
Named for Dr. Tadayuki Numano (1931-2001) of Okayama University.
Cu dominant analogue of Borcarite, with which it forms a partial series.


Classification of NumanoiteHide

Approved
Approval Year:
2005
6.DA.40

6 : BORATES
D : Tetraborates
A : Neso-tetraborates

Physical Properties of NumanoiteHide

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}
Density:
2.96 g/cm3 (Measured)    2.96 g/cm3 (Calculated)

Optical Data of NumanoiteHide

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.
Surface Relief:
Moderate

Chemical Properties of NumanoiteHide

Formula:
Ca4Cu(B4O6(OH)6)(CO3)2
IMA Formula:
Ca4CuB4O6(OH)6(CO3)2

Crystallography of NumanoiteHide

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°
Ratio:
a:b:c = 2.123 : 1 : 0.531
Unit Cell V:
648.02 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 NumanoiteHide

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 NumanoiteHide

Other Language Names for NumanoiteHide

Japanese:沼野石
Simplified Chinese:碳硼铜钙石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Borcarite2 photos of Numanoite associated with Borcarite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.DA.10BoraxNa2(B4O5)(OH)4 · 8H2OMon. 2/m : B2/b
6.DA.15TincalconiteNa2(B4O7) · 5H2OTrig. 3 2 : R3 2
6.DA.20HungchaoiteMg(B4O7) · 9H2OTric. 1
6.DA.25FedorovskiteCa2Mg2B4O7(OH)6Orth. mmm (2/m 2/m 2/m) : Pbam
6.DA.25RoweiteCa2Mn2+2B4O7(OH)6Orth.
6.DA.30HydrochlorboriteCa4B8O15Cl2 · 21H2OMon.
6.DA.35UralboriteCa2[B3O3(OH)5 · OB(OH)3]Mon.
6.DA.40BorcariteCa4Mg(B4O6(OH)6)(CO3)2Tric.
6.DA.60Fontarnauite(Na,K)2(Sr,Ca) (SO4)[B5O8(OH)]·2H2OMon. 2/m : P21/b

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 NumanoiteHide

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 NumanoiteHide

Localities for NumanoiteHide

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 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
    • Chugoku Region
      • Okayama Prefecture
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
Ohnishi, et al. (2005) Kobutsu-Gakkai Koen-Yoshi (Abstract of the Meeting of the Mineralogical Society of Japan), 138.
Mineral and/or Locality  
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