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Numanoite

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Fuka mine, Bitchu-cho (Bicchu-cho), Takahashi, Okayama Prefecture, Chugoku Region, Honshu Island, Japan
© Knut Eldjarn

Show Numanoite Photos (5)
Formula:
Ca
 
4
Cu[(CO
 
3
)
 
2
|B
 
4
O
 
6
(OH)
 
6
]
System:MonoclinicColour:bluish green
Hardness:4½
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 Numanoite

IMA status:Approved 2005
Strunz 8th edition ID:5/H.13-20
Nickel-Strunz 10th (pending) edition ID:6.DA.40

6 : BORATES
D : Tetraborates
A : Neso-tetraborates
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Type Occurrence of Numanoite

Type Locality:Fuka mine, Bitchu-cho (Bicchu-cho), Takahashi, Okayama Prefecture, Chugoku Region, Honshu Island, Japan
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:
NifontoviteCalciteBultfonteiniteBorcarite

Physical Properties of Numanoite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:bluish green
Comment:Varies from quite intense to very pale, almost colorless, partly depending on thickness of the numanoite zone.
Hardness (Mohs):4½
Hardness (Vickers):VHN25=290 - 464 kg/mm2
Hardness Data:Measured
Cleavage:Perfect
{100} {110}
Density (measured):2.96 g/cm3
Density (calculated):2.96 g/cm3

Crystallography of Numanoite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
Cell Parameters:a = 17.794Å, b = 8.381Å, c = 4.4494Å
β = 102.42°
Ratio:a:b:c = 2.123 : 1 : 0.531
Unit Cell Volume:V 648.02 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
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

Chemical Properties of Numanoite

Formula:
Ca
 
4
Cu[(CO
 
3
)
 
2
|B
 
4
O
 
6
(OH)
 
6
]
All elements listed in formula:B, C, Ca, Cu, H, O
Empirical Formula:
Ca
 
4
Cu[B
 
4
O
 
6
(OH)
 
6
(CO
 
3
)
 
2
]

Relationship of Numanoite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.DA.10Borax
Na
 
2
[B
 
4
O
 
7
] · 10H
 
2
O
6.DA.15Tincalconite
Na
 
2
[B
 
4
O
 
7
] · 5H
 
2
O
6.DA.20Hungchaoite
Mg[B
 
4
O
 
7
] · 9H
 
2
O
6.DA.25Fedorovskite
Ca
 
2
(Mg,Mn
2+
 
)
 
2
[(OH)
 
6
|B
 
4
O
 
7
]
6.DA.25Roweite
Ca
 
2
Mn
2+
2
[(OH)
 
6
|B
 
4
O
 
7
]
6.DA.30Hydrochlorborite
Ca
 
4
B
 
8
O
 
15
Cl
 
2
·21H
 
2
O
6.DA.35Uralborite
Ca
 
2
[B
 
3
O
 
3
(OH)
 
5
·OB(OH)
 
3
]
6.DA.40Borcarite
Ca
 
4
Mg[(CO
 
3
)
 
2
|B
 
4
O
 
6
(OH)
 
6
]

Other Names for Numanoite

Synonyms:
IMA2005-050
Other Languages:
Japanese:沼野石

Other Information

Health Warning: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: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.

Masayuki Ohnishi, et al.: Numanoite, Ca4CuB4O6(OH)6(CO3)2, a new mineral species, the Cu-dominant analogue of borcarite from the Fuka mine, Okayama Prefecture, Japan", Canadian Mineralogist (in press).

Internet Links for Numanoite

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    Localities for Numanoite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Okayama Prefecture
          • Takahashi
            • Bitchu-cho (Bicchu-cho)
    		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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