Mathiasite Mineral Data

Mathiasite Mineral Data
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General Mathiasite Information

Help on Chemical Formula: Chemical Formula: (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38
Help on Composition: Composition: Molecular Weight = 1,682.56 gm
   Potassium   1.39 %  K     1.68 % K2O
   Strontium   0.52 %  Sr    0.62 % SrO
   Calcium     0.71 %  Ca    1.00 % CaO
   Magnesium   0.72 %  Mg    1.20 % MgO
   Titanium   36.99 %  Ti   61.72 % TiO2
   Chromium   18.54 %  Cr   24.25 % CrO
   Iron        4.98 %  Fe    6.41 % FeO
   Oxygen     36.13 %  O
             ______        ______ 
             100.00 %       96.86 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.6Ca0.3Sr0.1Ti13Cr6Fe2+1.5Mg0.5O38
Help on Environment: Environment: In kimberlite.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Jagersfontein mine, Orange Free State, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Frances Celia Morna Mathias (1913-), British-South African geochemist, University of Capetown, South Africa.
Help on Name Pronunciation: Name Pronunciation: Mathiasite + Pronunciation Say MATHIASITE
Help on Synonym: Synonym: ICSD 35353
  PDF 46-1468
 

Mathiasite Image

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Mathiasite

Comments: Mathiasite (M) exhibiting typical curvilinear cracks and incipient decomposition (upper left and lower right). Sample JFIS-I, Jagersfontein. Reflected light in air. (AmMin, v68:494).
Location: Metasomatized peridotites and heavy media concentrates from four kimberlites in the Republic of South Africa. Scale: Scale Bar 0.2 mm.
© American Mineralogist

Mathiasite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.99324
Help on Cell Dimensions: Cell Dimensions: a = 10.36, c = 20.65, Z = 3; V = 1,919.42 Den(Calc)= 4.37
Help on Crystal System: Crystal System: Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.44(1), 2.14(1), 2.25(0.9),
Click Here for Large Mathiasite Structure Window Crystal Structure:

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Gatehouse B M , Grey I E , Smyth J R , Acta Crystallographica, Section C , 39 (1983) p.421-422, Structure refinement of mathiasite, (K0.62Na0.14Ba0.14Sr0.10), [Ti12.90Cr3.10Mg1.53Fe2.15Zr0.67Ca0.29V0.36]O38, locality: peridotite nodules, Bultfonten kimblerlite, South africa

 

Physical Properties of Mathiasite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 4.6
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luster: Luster: Metallic
Help on Streak: Streak: gray
 

Optical Properties of Mathiasite

Help on Dichroism (e): Dichroism (e): dark tan.
Help on Dichroism (w): Dichroism (w): weaker dark tan.
Help on Optical Data: Optical Data: Uniaxial (?).
  NCalc= 2.36 - from Gladstone-Dale relationship (KC = 0.3122) where Ncalc=Dcalc*KC+1
NCalc= 2.44 - from Gladstone-Dale relationship (KC = 0.3122) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Moderate, brownish tan to dark brown.
Help on RL Color: RL Color: Tan.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Mathiasite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   20.10   20.80 
   
 420 nm   19.50   20.20 
 440 nm   19.00   19.70 
 460 nm   18.50   19.20 
 480 nm   18.10   18.60 
 500 nm   17.70   18.40 
 520 nm   17.40   18.20 
 540 nm   17.20   17.90 
 560 nm   16.90   17.70 
 580 nm   16.80   17.60 
 600 nm   16.60   17.40 
 620 nm   16.50   17.40 
 640 nm   16.50   17.30 
 660 nm   16.50   17.30 
 680 nm   16.40   17.30 
 700 nm   16.40   17.30 
Calculated Relative Intensity Colors of Mathiasite in Air
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 520%
R1                      
R2                      
 

Calculated Properties of Mathiasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.16 gm/cc
note: Specific Gravity of Mathiasite =4.37 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEMathiasite = 12.77 barns/electron
U=PEMathiasite x relectron= 53.09 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 19.11 (Gamma Ray American Petroleum Institute Units)
Concentration of Mathiasite per GRapi unit = 5.23 (%)

Estimated Radioactivity from Mathiasite - barely detectable

 

Mathiasite Classification
Help on Dana Class: Dana Class: 08.05.01.07 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.05)Dana Type
  (08.05.01)Crichtonite group (ABC18 T2 O38)
 
08.05.01.01 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
08.05.01.02 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
08.05.01.03 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
08.05.01.04 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 
08.05.01.05 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
08.05.01.06 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
08.05.01.07 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
08.05.01.08 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
08.05.01.09 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
08.05.01.10 Cleusonite! Pb(U,U)(Ti,Fe,Fe)20(O,OH)38 R 3 3
 
08.05.01.11 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
Help on Strunz Class: Strunz Class: 04.CC.40 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.C - Metal:Oxygen = 2:3, 3:5, and Similar
  04.CC -With large and medium-sized cations
 
04.CC.40 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
04.CC.40 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
04.CC.40 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
04.CC.40 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
04.CC.40 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
04.CC.40 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
04.CC.40 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
04.CC.40 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
04.CC.40 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 
04.CC.40 Cleusonite! Pb(U,U)(Ti,Fe,Fe)20(O,OH)38 R 3 3
 
04.CC.40 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
 

Other Mathiasite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Mathiasite :
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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Print or Cut-and-Paste your Mathiasite Specimen Label here :

Mathiasite

(K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38
Dana No: 08.05.01.07 Strunz No: 04.CC.40
Locality:

 

Notes: