Henmilite Mineral Data

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Henmilite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Henmilite :

A Bijoux Google Search for Henmilite
Adam's Minerals Google Search for Henmilite
Cape Minerals Google Search for Henmilite
Dakota Matrix Minerals Google Search for Henmilite
Excalibur Mineral Corp. Google Search for Henmilite
Exceptional Minerals Google Search for Henmilite
John Betts Fine Minerals Search for Henmilite
McDougall Minerals Google Search for Henmilite
Mineral News Website Link
Rock and Mineral Shows Google Search for Henmilite
Weinrich Minerals, Inc. Google Search for Henmilite

Ask about Henmilite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
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: