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Clinohumite Mineral Data

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General Clinohumite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Fe++)9(SiO4)4(F,OH)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mg6.75Fe2+2.25(SiO4)4F1.5(OH)0.5
Help on Environment: Environment: Commonly interlayered with humite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1876
Help on Locality: Locality: Mte. Somma, Vesuvius, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the mineral humite and the monoclinic crystal form.
Help on Synonym: Synonym: Titanclinohumite

Clinohumite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =2.8832:1:2.164
Help on Cell Dimensions: Cell Dimensions: a = 13.71, b = 4.755, c = 10.29, Z = 2; beta = 100.833° V = 658.86 Den(Calc)= 3.50
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.74(1), 3.7(0.7), 5.02(0.7),

Physical Properties of Clinohumite

Help on Cleavage: Cleavage: {001} Poor
Help on Color: Color: Brown, Yellow, White, Orange, Reddish brown.
Help on Density: Density: 3.17 - 3.35, Average = 3.26
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Clinohumite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): brownish yellow or pale golden yellow.
Help on Pleochroism (y): Pleochroism (y): pale yellow, greenish yellow, or colorless.
Help on Pleochroism (z): Pleochroism (z): pale yellow or colorless.

Calculated Properties of Clinohumite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Clinohumite =3.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEClinohumite = 6.52 barns/electron
U=PEClinohumite x rElectron Density= 22.42 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Clinohumite is Not Radioactive

Clinohumite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: 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 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - University of Colorado - Mineral Structure Data

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Dana No: 52.03.02d.01 Strunz No: 09.AF.55





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