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Henmilite

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Henmis
Formula:
Ca2Cu[B(OH)4]2(OH)4
System:
Triclinic
Hardness:
1½ - 2
Name:
Named for Professor Kitinosuke Henmi and his daughter Dr. Chiyoko Henmi,Department of Earth Science, Okayama University, in recognition of their work on skarn minerals from Fuka.
This page provides mineralogical data about Henmilite.


Classification of Henmilite

Approved
Approval Year:
1981
6.AC.30

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
26.1.5.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
1 : Monoborates
9.3.25

9 : Borates
3 : Borates of Ca and Sr

Physical Properties of Henmilite

Hardness (Mohs):
1½ - 2

Optical Data of Henmilite

Type:
Biaxial (-)
RI values:
nα = 1.585 nβ = 1.608 nγ = 1.615
2V:
Measured: 58° , Calculated: 56°
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
small

Chemical Properties of Henmilite

Formula:
Ca2Cu[B(OH)4]2(OH)4
Elements listed in formula:

Crystallography of Henmilite

Crystal System:
Triclinic
Cell Parameters:
a = 5.76 Å, b = 7.97 Å, c = 5.64 Å
α = 109.61°, β = 91.47°, γ = 83.68°
Ratio:
a:b:c = 0.723 : 1 : 0.708
Unit Cell Volume:
V 242.40 ų (Calculated from Unit Cell)

Type Occurrence of Henmilite

Relationship of Henmilite to other Species

6.AC.05SinhaliteMgAlBO4
6.AC.10PseudosinhaliteMg2Al3B2O9(OH)
6.AC.15BéhieriteTaBO4
6.AC.15SchiavinatoiteNbBO4
6.AC.20FroloviteCa[B(OH)4]2
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O
6.AC.35BandyliteCuB(OH)4Cl
6.AC.40TeepleiteNa2B(OH)4Cl
6.AC.45Moydite-(Y)YB(OH)4CO3
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2O
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2
6.AC.60LüneburgiteMg3[B2(OH)6(PO4)2] · 6H2O
6.AC.65SeamaniteMn32+B(OH)4(PO4)(OH)2
6.AC.70CahniteCa2B(AsO4)(OH)4
9.3.1CalciboriteCaB2O4
9.3.2SibirskiteCaHBO3
9.3.3FabianiteCaB3O5(OH)
9.3.4UralboriteCaB2O2(OH)4
9.3.5VimsiteCaB2O2(OH)4
9.3.6OlshanskyiteCa2[B3O3(OH)6]OH · 3H2O
9.3.7FroloviteCa[B(OH)4]2
9.3.8KorzhinskiteCaB2O4 · 0.5H2O
9.3.9TyretskiteCa2B5O9(OH) · H2O
9.3.10NifontoviteCa3[BO(OH)2]6 · 2H2O
9.3.12InyoiteCaB3O3(OH)5 · 4H2O
9.3.13GoweriteCa[B5O8(OH)][B(OH)3] · 3H2O
9.3.14ColemaniteCaB3O4(OH)3 · H2O
9.3.15PentahydroboriteCaB2O(OH)6 · 2H2O
9.3.16HexahydroboriteCa[B(OH)4]2 · 2H2O
9.3.17MeyerhofferiteCaB3O3(OH)5 · H2O
9.3.18PriceiteCa2B5O7(OH)5 · H2O
9.3.19GinoriteCa2B14O20(OH)6 · 5H2O
9.3.20ProbertiteNaCaB5O7(OH)4 · 3H2O
9.3.21UlexiteNaCaB5O6(OH)6 · 5H2O
9.3.22HydroboraciteCaMg[B3O4(OH)3]2 · 3H2O
9.3.23InderboriteCaMg[B3O3(OH)5]2 · 6H2O
9.3.24WardsmithiteCa5Mg(B4O7)6 · 30H2O
9.3.26StrontioboriteSrB8O11(OH)4
9.3.27VeatchiteSr2[B5O8(OH)]2B(OH)3 · H2O
9.3.28Veatchite-ASr2B11O16(OH)5 · H2O
9.3.29 P-VeatchiteSr2B11O16(OH)5 · H2O
9.3.30 BalavinskiteSr2B6O11 · 4H2O
9.3.31TunelliteSrB6O9(OH)2 · 3H2O
9.3.32StrontioginoriteSrCaB14O20(OH)6 · 5H2O

Other Names for Henmilite

Name in Other Languages:
German:Henmilit
Spanish:Henmilita

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 Henmilite

Reference List:
Nakai, I., Okada, H., Masutomi, K., Koyama, E. and Nagashima, K. (1986) Henmilite, Ca2Cu(OH)4[B(OH)4]2, a new mineral from Fuka, Okayama Prefecture, Japan. American Mineralogist, 71, 1234-1239.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Henmilite

mindat.org URL:
https://www.mindat.org/min-1866.html
Please feel free to link to this page.
Specimens:
The following Henmilite specimens are currently listed for sale on minfind.com.

Localities for Henmilite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
 
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
American Mineralogist (1986): 71: 1234-1239; Mineralogical Record (1996): 27: 303.; KUSACHI, I., & HENMI, C. (1991). Sillenite from Fuka, Okayama prefecture, Japan. Mineralogical Journal, 15(8), 343-348.
Mineral and/or Locality  
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