Mineralogy Database

Homilite Mineral Data

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General Homilite Information

Help on Chemical  Formula: Chemical Formula: Ca2(Fe++,Mg)B2Si2O10
Help on Composition: Composition: Molecular Weight = 365.90 gm
   Calcium    21.91 %  Ca   30.65 % CaO
   Magnesium   1.66 %  Mg    2.75 % MgO
   Iron       11.45 %  Fe   14.73 % FeO
   Silicon    15.35 %  Si   32.84 % SiO2
   Boron       5.91 %  B    19.03 % B2O3
   Oxygen     43.73 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Fe2+0.75Mg0.25B2Si2O10
Help on Environment: Environment: In pegmatite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1896
Help on Locality: Locality: Stoko island, Langesundfiord, southern Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for "to occur together", in allusion to its association with meliphanite and "erdmannite" (allanite).
Help on Name Pronunciation: Name Pronunciation: Homilite Say HOMILITE
Help on Synonym: Synonym: ICSD 47157
  PDF 36-430
 

Homilite Image

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  Homilite

Comments: Brown crystalline masses of homilite in white feldspar.
Location: Aroy, Langesundfjord, Telemark, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Homilite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.2774:1:0.6261
Help on Cell Dimensions: Cell Dimensions: a = 9.67, b = 7.57, c = 4.74, Z = 2; beta = 90.367° V = 346.97 Den(Calc)= 3.50
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.52(1), 3.1(1), 2.83(0.9),
 

Physical Properties of Homilite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black, Blackish brown.
Help on Density: Density: 3.38
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
 

Optical Properties of Homilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.039 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2074,KPDmeas= 0.2148,KC= 0.2068
Ncalc = 1.7 - 1.72
Help on Optical Data: Optical Data: Biaxial (+), a=1.715, b=1.725, g=1.738, bire=0.0230, 2V(Calc)=84, 2V(Meas)=80.
 

Calculated Properties of Homilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.45 gm/cc
note: Specific Gravity of Homilite =3.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEHomilite = 6.78 barns/electron
U=PEHomilite x rElectron Density= 23.41 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Homilite is Not Radioactive
 

Homilite Classification

Help on  Dana Class: Dana Class: 54.02.01b.05 (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.02)with B in [4] coordination
  (54.02.01b)Datolite group (Homilite series)
 
54.02.01b.01 Bakerite Ca4B4(BO4)(SiO4)3(OH)3•(H2O) P 21/c 2/m
 
54.02.01b.02 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 21/c 2/m
 
54.02.01b.03 Gadolinite-(Y) Y2FeBe2Si2O10 P 21/a 2/m
 
54.02.01b.04 Calciogadolinite? CaREE(Fe)Be2Si2O10 P 21/a 2/m
 
54.02.01b.05 Homilite Ca2(Fe,Mg)B2Si2O10 P 21/a 2/m
 
54.02.01b.06 Minasgeraisite-(Y) CaY2Be2Si2O10 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.AJ.20 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,
 
09.AJ.20 Bakerite Ca4B4(BO4)(SiO4)3(OH)3•(H2O) P 21/c 2/m
 
09.AJ.20 Calcybeborosilite-(Y)! (REE,Ca)2[](B,Be)2(SiO4)2(OH,O)2 P 21/a 2/m
 
09.AJ.20 Calciogadolinite? CaREE(Fe)Be2Si2O10 P 21/a 2/m
 
09.AJ.20 Datolite CaBSiO4(OH) P 21/c 2/m
 
09.AJ.20 Hingganite-(Yb) (Yb,Y)2([])Be2Si2O8(OH)2 P 21/a 2/m
 
09.AJ.20 Homilite Ca2(Fe,Mg)B2Si2O10 P 21/a 2/m
 
09.AJ.20 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 21/c 2/m
 
09.AJ.20 Gadolinite-(Y) Y2FeBe2Si2O10 P 21/a 2/m
 
09.AJ.20 Hingganite-(Ce) (Ce,Ca)2([],Fe)Be2Si2O8[(OH),O]2 P 21/a 2/m
 
09.AJ.20 Hingganite-(Y) Y2([])Be2Si2O8(OH)2 P 21/a 2/m
 
09.AJ.20 Melanocerite-(Ce) (Ce,Th,Ca)5(Si,B)3O12(OH,F)•n(H2O)(?) Unk (HEX-R) Trig
 
09.AJ.20 Minasgeraisite-(Y) CaY2Be2Si2O10 P 21/a 2/m
 

Other Homilite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Homilite :
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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Homilite

Ca2(Fe++,Mg)B2Si2O10
Dana No: 54.02.01b.05 Strunz No: 09.AJ.20
Locality:

 

Notes:

 

 
   
 


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