Homilite Mineral Data (original) (raw)

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

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

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 - PrismaticH-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),

Click Here for Large Homilite Structure Window 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

| | Miyawaki R , Nakai I , Nagashima K , Acta Crystallographica, Section C , 41 (1985) p.13-15, Structure of homilite, Ca2.00(Fe0.90Mn0.03)B2.00Si2.00O9.86(OH)0.14, Locality: Stoko, Brevig, Langesundfjord, Norway, Note: anisoB s form ICSD | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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

Search for Homilite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Homilite :

A Bijoux Google Search for Homilite
Adam's Minerals Google Search for Homilite
Cape Minerals Google Search for Homilite
Dakota Matrix Minerals Google Search for Homilite
Excalibur Mineral Corp. Google Search for Homilite
Exceptional Minerals Google Search for Homilite
John Betts Fine Minerals Search for Homilite
McDougall Minerals Google Search for Homilite
Mineral News Website Link
Rock and Mineral Shows Google Search for Homilite
Weinrich Minerals, Inc. Google Search 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: