Mineralogy Database

Tilasite Mineral Data

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General Tilasite Information

Help on Chemical  Formula: Chemical Formula: CaMg(AsO4)F
Help on Composition: Composition: Molecular Weight = 222.30 gm
   Calcium    18.03 %  Ca   25.23 % CaO
   Magnesium  10.93 %  Mg   18.13 % MgO
   Arsenic    33.70 %  As   51.70 % As2O5
   Oxygen     28.79 %  O
   Fluorine    8.55 %  F     8.55 % F
                -   %   F    -3.60 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMg(AsO4)F
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1895
Help on Locality: Locality: Langan, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Daniel Tilas (1712-1772), Swedish mining engineer.
Help on Name Pronunciation: Name Pronunciation: Tilasite Say TILASITE
Help on Synonym: Synonym: ICSD 75618
  PDF 2-485
 

Tilasite Image

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  Tilasite

Comments: Brownish, prismatic crystals of tilasite.
Location: Cervandone, Val d'Ossola Lombardy, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Tilasite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8438:1:0.7486
Help on Cell Dimensions: Cell Dimensions: a = 7.553, b = 8.951, c = 6.701, Z = 4; beta = 120.967° V = 388.46 Den(Calc)= 3.80
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.246(1), 2.682(0.9), 3.073(0.8),
Help on Forms: Forms:

Mouse
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RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

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I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 3 1) ( 1 1 1) ( 1 0 0) ( 0 0 1)

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Physical Properties of Tilasite

Help on Cleavage: Cleavage: {101} Good
Help on Color: Color: Violet gray, Green, Gray, Pink brown.
Help on Density: Density: 3.77
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luminescence: Luminescence: Fluorescent, Short UV=pink-orange.
Help on Luster: Luster: Vitreous - Resinous
 

Optical Properties of Tilasite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1732,KPDmeas= 0.1746,KC= 0.177
Ncalc = 1.67
Help on Optical Data: Optical Data: Biaxial (-), a=1.64, b=1.66, g=1.675, bire=0.0350, 2V(Calc)=80, 2V(Meas)=82.733. Dispersion r < v.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Tilasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.60 gm/cc
note: Specific Gravity of Tilasite =3.77 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETilasite = 25.48 barns/electron
U=PETilasite x rElectron Density= 91.61 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tilasite is Not Radioactive
 

Tilasite Classification

Help on  Dana Class: Dana Class: 41.05.06.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.05)where (A B)2 (XO4) Zq
  (41.05.06)Tilasite Group
 
41.05.06.01 Tilasite CaMg(AsO4)F C 2/c 2/m
 
41.05.06.02 Isokite CaMg(PO4)F C 2/c 2/m
 
41.05.06.03 Panasqueiraite CaMg(PO4)(OH,F) C 2/c 2/m
Help on  Strunz Class: Strunz Class: 08.BH.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1
 
08.BH.10 Durangite NaAl(AsO4)F C 2/c 2/m
 
08.BH.10 Isokite CaMg(PO4)F C 2/c 2/m
 
08.BH.10 Lacroixite NaAl(PO4)F C 2/c 2/m
 
08.BH.10 Maxwellite NaFe(AsO4)F Aa,A2/a Mono
 
08.BH.10 Panasqueiraite CaMg(PO4)(OH,F) C 2/c 2/m
 
08.BH.10 Tilasite CaMg(AsO4)F C 2/c 2/m
 

Other Tilasite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Tilasite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Tilasite

CaMg(AsO4)F
Dana No: 41.05.06.01 Strunz No: 08.BH.10
Locality:

 

Notes:

 

 
   
 


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