Homilite Mineral Data
General Homilite Information
Chemical Formula:
Ca2(Fe++,Mg)B2Si2O10
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 % B2 O3
Oxygen 43.73 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca2 Fe2+ 0.75 Mg0.25 B2 Si2 O10
Environment:
In pegmatite.
IMA Status:
Valid Species (Pre-IMA) 1896
Locality:
Stoko island, Langesundfiord, southern Norway. Link to MinDat.org Location Data.
Name Origin:
Named from the Greek for "to occur together", in allusion to its association with meliphanite and "erdmannite" (allanite).
Name Pronunciation:
Homilite
Synonym:
ICSD 47157
PDF 36-430
Homilite Image
Images:
Homilite Crystallography
Axial Ratios:
a:b:c =1.2774:1:0.6261
Cell Dimensions:
a = 9.67, b = 7.57, c = 4.74, Z = 2; beta = 90.367° V = 346.97 Den(Calc)= 3.50
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21 /a
X Ray Diffraction:
By Intensity(I/Io ): 2.52(1), 3.1(1), 2.83(0.9),
Physical Properties of Homilite
Cleavage:
None
Color:
Black, Blackish brown.
Density:
3.38
Diaphaneity:
Translucent to subtranslucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Optical Properties of Homilite
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
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
Electron Density:
Bulk Density (Electron Density)=3.45 gm/cc note: Specific Gravity of Homilite =3.50 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEHomilite = 6.78 barns/electronU=PEHomilite x r Electron Density= 23.41 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Homilite is Not Radioactive
Homilite Classification
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
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
References:
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
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
Search for Homilite using:
[AOL ]
[Bing ]
[Dog Pile ]
[GeoScienceWorld ]
[HotBot ]
[Ixquick ]
[Lycos ]
[MAMMA ]
[Scirus ]
[Teoma ]
[WebCrawler ]
[Wikipedia ]
[YAHOO ]
Visit our Advertisers for Homilite :
Ask about Homilite 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
Espa�ol
Print or Cut-and-Paste your Homilite Specimen Label here :
Homilite
Ca2(Fe++,Mg)B2Si2O10
Dana No: 54.02.01b.05 Strunz No: 09.AJ.20
Locality:
Notes:
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.