Mathiasite Mineral Data (original) (raw)
General Mathiasite Information
Chemical Formula:
(K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38
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
Empirical Formula:
K0.6Ca0.3Sr0.1Ti13Cr6Fe2+1.5Mg0.5O38
Environment:
In kimberlite.
IMA Status:
Approved IMA 1983
Locality:
Jagersfontein mine, Orange Free State, South Africa. Link to MinDat.org Location Data.
Name Origin:
Named for Frances Celia Morna Mathias (1913-), British-South African geochemist, University of Capetown, South Africa.
Name Pronunciation:
Mathiasite + Pronunciation 
Synonym:
ICSD 35353
PDF 46-1468
Mathiasite Image
Images:
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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 |
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Mathiasite Crystallography
Axial Ratios:
a:c = 1:1.99324
Cell Dimensions:
a = 10.36, c = 20.65, Z = 3; V = 1,919.42 Den(Calc)= 4.37
Crystal System:
Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3
X Ray Diffraction:
By Intensity(I/Io): 1.44(1), 2.14(1), 2.25(0.9),
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
Cleavage:
None
Color:
Black.
Density:
4.6
Diaphaneity:
Opaque
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Hardness:
7.5 - Garnet
Luster:
Metallic
Streak:
gray
Optical Properties of Mathiasite
Dichroism (e):
dark tan.
Dichroism (w):
weaker dark tan.
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
RL Anisotrophism:
Moderate, brownish tan to dark brown.
RL Color:
Tan.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Mathiasite in Air
| λ | R1 | R 2 |  |
∑ R1(λ) | ∑ R2(λ) |
|---|---|---|---|---|---|
| 400 nm | 20.10 | 20.80 |  |
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| 420 nm | 19.50 | 20.20 |  |
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| 440 nm | 19.00 | 19.70 |  |
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| 460 nm | 18.50 | 19.20 |  |
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| 480 nm | 18.10 | 18.60 |  |
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| 500 nm | 17.70 | 18.40 |  |
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| 520 nm | 17.40 | 18.20 |  |
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| 540 nm | 17.20 | 17.90 |  |
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| 560 nm | 16.90 | 17.70 |  |
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| 580 nm | 16.80 | 17.60 |  |
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| 600 nm | 16.60 | 17.40 |  |
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| 620 nm | 16.50 | 17.40 |  |
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| 640 nm | 16.50 | 17.30 |  |
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| 660 nm | 16.50 | 17.30 |  |
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| 680 nm | 16.40 | 17.30 |  |
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| 700 nm | 16.40 | 17.30 |  |
Calculated Relative Intensity Colors of Mathiasite in Air
| RelativeIntensity | 0% | 60% | 100% | 120% | 180% | 240% | 300% | 360% | 420% | 480% | 520% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| R1 | |||||||||||
| R2 |
Calculated Properties of Mathiasite
Electron Density:
Bulk Density (Electron Density)=4.16 gm/cc
note: Specific Gravity of Mathiasite =4.37 gm/cc.
Fermion Index:
Fermion Index = 0.06
Boson Index = 0.94
Photoelectric:
PEMathiasite = 12.77 barns/electron
U=PEMathiasite x relectron= 53.09 barns/cc.
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
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
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
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
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: