Clinohumite Mineral Data

[Mineral Forums] [Minerals for Sale] [About Us] [En Espanol] [Mineral Gallery]
Fabre Minerals - Europe's first Internet mineral dealer, on the web since 1996

General Clinohumite Information

Chemical Formula:

(Mg,Fe++)9(SiO4)4(F,OH)2

Composition:

Molecular Weight = 695.05 gm

Magnesium 23.60 % Mg 39.14 % MgO

Iron 18.08 % Fe 23.26 % FeO

Silicon 16.16 % Si 34.58 % SiO₂

Hydrogen 0.07 % H 0.65 % H₂O

Oxygen 37.98 % O

Fluorine 4.10 % F 4.10 % F

- % F -1.73 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_6.75Fe²⁺_2.25(SiO₄)₄F_1.5(OH)_0.5

Environment:

Commonly interlayered with humite.

IMA Status:

Valid Species (Pre-IMA) 1876

Locality:

Mte. Somma, Vesuvius, Italy. Link to MinDat.org Location Data.

Name Origin:

Named after the mineral humite and the monoclinic crystal form.

Synonym:

Titanclinohumite

Clinohumite Image

Images:

Clinohumite

Comments: Orange-brown glassy crystalline clinohumite.
Location: Kuhi-Lal, Pamir, Gorno-Badahsan, Tadzhikistan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Clinohumite Crystallography

Axial Ratios:

a:b:c =2.8832:1:2.164

Cell Dimensions:

a = 13.71, b = 4.755, c = 10.29, Z = 2; beta = 100.833° V = 658.86 Den(Calc)= 3.50

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 1.74(1), 3.7(0.7), 5.02(0.7),

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

Ottolini L , Camara F , Bigi S , American Mineralogist , 85 (2000) p.89-102, An investigation of matrix effects in the analysis of fluorine in humite-group, minerals by EMPA, SIMS, and SREF, Sample: Chum HV-41 n.3

View Additional jPOWD Structure files for Clinohumite
[1] [2] [3]

Physical Properties of Clinohumite

Cleavage:

{001} Poor

Color:

Brown, Yellow, White, Orange, Reddish brown.

Density:

3.17 - 3.35, Average = 3.26

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Clinohumite

Gladstone-Dale:

CI meas= -0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1928,KPDmeas= 0.207,KC= 0.1981
Ncalc = 1.63 - 1.69

Optical Data:

Biaxial (+), a=1.623-1.702, b=1.636-1.709, g=1.651-1.728, bire=0.0260-0.0280, 2V(Calc)=64-88, 2V(Meas)=52-90. Dispersion weak, r > v.

Pleochroism (x):

brownish yellow or pale golden yellow.

Pleochroism (y):

pale yellow, greenish yellow, or colorless.

Pleochroism (z):

pale yellow or colorless.

Calculated Properties of Clinohumite

Electron Density:

Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Clinohumite =3.50 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Clinohumite= 6.52 barns/electron
U=PE_Clinohumite x rElectron Density= 22.42 barns/cc.

Radioactivity:

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

Clinohumite Classification

Dana Class:

52.03.02d.01 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.03)with cations in [6] coordination only

(52.03.02d)Humite group (Clinohumite series)

52.03.02d.01 Clinohumite (Mg,Fe)9(SiO4)4(F,OH)2 P 2₁/c 2/m

52.03.02d.02 Jerrygibbsite (Mn,Zn)9(SiO4)4(OH)2 Pbn21 mm2

52.03.02d.03 Sonolite Mn9(SiO4)4(OH,F)2 P 2₁/a 2/m

52.03.02d.04 Hydroxylclinohumite! Mg9(SiO4)4(OH,F)2 P 2₁/c 2/m

Strunz Class:

09.AF.55 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AF -Nesosilicates with additional anions;

09.AF.55 Clinohumite (Mg,Fe)9(SiO4)4(F,OH)2 P 2₁/c 2/m

09.AF.55 Sonolite Mn9(SiO4)4(OH,F)2 P 2₁/a 2/m

09.AF.55 Hydroxylclinohumite! Mg9(SiO4)4(OH,F)2 P 2₁/c 2/m

Other Clinohumite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Clinohumite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - University of Colorado - Mineral Structure Data
18 - WWW-MINCRYST

Search for Clinohumite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Clinohumite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Clinohumite Mineral Data :

Ask about Clinohumite 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 Clinohumite Specimen Label here :

Clinohumite

(Mg,Fe++)9(SiO4)4(F,OH)2
Dana No: 52.03.02d.01 Strunz No: 09.AF.55
Locality:

Notes: