Humite Mineral Data

Humite Mineral Data
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General Humite Information

Help on Chemical Formula: Chemical Formula: (Mg,Fe++)7(SiO4)3(F,OH)2
Help on Composition: Composition: Molecular Weight = 538.58 gm
   Magnesium  23.69 %  Mg   39.29 % MgO
   Iron       18.15 %  Fe   23.34 % FeO
   Silicon    15.64 %  Si   33.47 % SiO2
   Hydrogen    0.09 %  H     0.84 % H2O
   Oxygen     37.13 %  O
   Fluorine    5.29 %  F     5.29 % F
                -   %   F    -2.23 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg5.25Fe2+1.75(SiO4)3F1.5(OH)0.5
Help on Environment: Environment: Commonly interlayered with clinohumite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1813
Help on Locality: Locality: Mte. Somma, Vesuvius, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Abraham Hume (1749-1838), English connoisseur and collector of works of art, precious stones and minerals.
Help on Name Pronunciation: Name Pronunciation: Humite Say HUMITE
Help on Synonym: Synonym: ICSD 34847
  PDF 12-755
 

Humite Image

Click Here for Larger Humite Image in a New Browser Window Images:
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Humite

Comments: Striated, brown, tabular crystals of humite.
Location: Monte Somma (Vesuvius), Campania, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Humite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.4943:1:0.2285
Help on Cell Dimensions: Cell Dimensions: a = 10.243, b = 20.72, c = 4.735, Z = 4; V = 1,004.93 Den(Calc)= 3.56
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.256(1), 1.479(0.7), 2.438(0.7),
Click Here for Large Humite Structure Window Crystal Structure:

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Ribbe P H , Gibbs G V , American Mineralogist , 56 (1971) p.1155-1173, Crystal structures of the humite minerals: III. Mg/Fe ordering in humite and its, relation to other ferromagnesian silicates

 

Physical Properties of Humite

Help on Cleavage: Cleavage: {001} Poor
Help on Color: Color: Brown, Yellow, White, Dark orange.
Help on Density: Density: 3.1 - 3.2, Average = 3.15
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Humite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.09 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1796,KPDmeas= 0.203,KC= 0.1974
Ncalc = 1.61 - 1.7
Help on Optical Data: Optical Data: Biaxial (+), a=1.607-1.643, b=1.619-1.653, g=1.639-1.675, bire=0.0320, 2V(Calc)=70-78, 2V(Meas)=68-81. Dispersion weak, r > v.
Help on Pleochroism (x): Pleochroism (x): pale golden yellow or deep golden yellow.
Help on Pleochroism (y): Pleochroism (y): pale yellow or colorless.
Help on Pleochroism (z): Pleochroism (z): golden yellow or pale yellow.
 

Calculated Properties of Humite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Humite =3.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEHumite = 6.53 barns/electron
U=PEHumite x rElectron Density= 20.20 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Humite is Not Radioactive
 

Humite Classification
Help on Dana Class: Dana Class: 52.03.02c.01 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03)with cations in [6] coordination only
  (52.03.02c)Humite group (Humite series)
 
52.03.02c.01 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m
 
52.03.02c.02 Leucophoenicite Mn7(SiO4)3(OH)2 P 21/a 2/m
 
52.03.02c.03 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
 
52.03.02c.04 Chegemite! Ca7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 09.AF.50 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
 
09.AF.50 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
 
09.AF.50 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m
 
09.AF.50 Chegemite! Ca7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
 

Other Humite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Humite :
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 - Scandinavian mineral gallery
18 - University of Colorado - Mineral Structure Data
19 - WWW-MINCRYST

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

Humite

(Mg,Fe++)7(SiO4)3(F,OH)2
Dana No: 52.03.02c.01 Strunz No: 09.AF.50
Locality:

 

Notes: