Henmilite Mineral Data

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General Henmilite Information

Chemical Formula:

Ca2Cu[B(OH)4]2(OH)4

Composition:

Molecular Weight = 369.41 gm

Calcium 21.70 % Ca 30.36 % CaO

Copper 17.20 % Cu 21.53 % CuO

Boron 5.85 % B 18.85 % B₂O₃

Hydrogen 3.27 % H 29.26 % H₂O

Oxygen 51.97 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂CuB₂(OH)₁₂

Environment:

In borate veins cutting contact-metasomatized marble.

IMA Status:

Approved IMA 1986

Locality:

Fuka mine, Okayama, Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for Kitinosuke Henmi (1919-1997) and his daughter Chiyoko Henmi (1949-) for their work on the Skarn deposit at Fuka, Japan.

Name Pronunciation:

Henmilite + Pronunciation

Synonym:

ICSD 202148

PDF 40-481

Henmilite Image

Images:

Henmilite

Comments: Blue crystals of henmilite in matrix.
Location: Fuka Mine, Bitchu-Cho, Okayama Prefecture, Chugoku Region, Honshu Island, Japan. Scale: Crystal size 3 mm.
© John Veevaert

Images:

Henmilite Olshanskyite

Comments: Milky white olshanskyite hosting crystals of deep blue henmilite to 6 mm across.
Location: Fuka Mine, Bicchu Town, Kawakama Co., Okayama Pref., Japan. Scale: Crystal size 6 mm.
© John Veevaert

Henmilite Crystallography

Axial Ratios:

a:b:c =0.7222:1:0.7081

Cell Dimensions:

a = 5.7617, b = 7.9774, c = 5.6488, Z = 1; alpha = 109.611°, beta = 91.473°, gamma = 83.686° V = 243.01 Den(Calc)= 2.52

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.25(1), 4.35(0.5), 3.709(0.4),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
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Nakai I , Okada H , Masutomi K , Koyama E , Nagashima K , American Mineralogist , 71 (1986) p.1236-1239, Henmilite, Ca2Cu(OH)4[B(OH)4]2, a new mineral from Fuka, Okayama Prefecture,, Japan. II. Crystal structure

Physical Properties of Henmilite

Color:

Bluish violet.

Density:

2.51

Diaphaneity:

Transparent

Fracture:

Fragile - Crystals with a delicate and easily injured structure.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Vitreous (Glassy)

Streak:

pale violet

Optical Properties of Henmilite

Gladstone-Dale:

CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2392,KPDmeas= 0.2401,KC= 0.2404
Ncalc = 1.6 - 1.61

Optical Data:

Biaxial (-), a=1.585, b=1.608, g=1.615, bire=0.0300, 2V(Calc)=56, 2V(Meas)=58.

Pleochroism (x):

pale pink.

Pleochroism (y):

pale purple.

Pleochroism (z):

pale blue.

Calculated Properties of Henmilite

Electron Density:

Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Henmilite =2.51 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Henmilite= 9.95 barns/electron
U=PE_Henmilite x rElectron Density= 25.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Henmilite is Not Radioactive

Henmilite Classification

Dana Class:

26.01.05.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.01)Dana Type

(26.01.05)Dana Group

26.01.05.01 Henmilite Ca2Cu[B(OH)4]2(OH)4 P1 1

Strunz Class:

06.AC.30 06 - BORATES

06.A - Monoborates

06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.

06.AC.30 Henmilite Ca2Cu[B(OH)4]2(OH)4 P1 1

Other Henmilite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.71,p1234-1239,1986) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Henmilite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Henmilite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Henmilite Specimen Label here :

Henmilite

Ca2Cu[B(OH)4]2(OH)4
Dana No: 26.01.05.01 Strunz No: 06.AC.30
Locality:

Notes: