Mineralogy Database

Senaite Mineral Data

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General Senaite Information

Help on Chemical  Formula: Chemical Formula: Pb(Ti,Fe,Mn)21O38
Help on Composition: Composition: Molecular Weight = 1,904.66 gm
   Titanium   25.14 %  Ti   41.94 % TiO2
   Manganese  11.54 %  Mn   14.90 % MnO
   Iron       20.52 %  Fe   26.40 % FeO
   Lead       10.88 %  Pb   11.72 % PbO
   Oxygen     31.92 %  O
             ______        ______ 
             100.00 %       94.96 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbTi10Fe2+7Mn2+4O38
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1898
Help on Locality: Locality: Dattos, Curralinho, and other localities near Diamantina, Minas Gerias, Brazil. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Joaquim de Costa Sena, Esola de Minas, Ouro Preto, Brazil.
Help on Name Pronunciation: Name Pronunciation: Senaite Say SENAITE
Help on Synonym: Synonym: ICSD 84
  PDF 20-1048

Senaite Image

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Comments: Brownish-black senaite cleavage.
Location: Dattas, near Diamantina, Minas Gerais, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Black crystal of senaite.
Location: Presidente Kibitschek, Minas Gerias, Brazil. Scale: Crystal size 2 mm.
© Dave Barthelmy

Senaite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.0024
Help on Cell Dimensions: Cell Dimensions: a = 10.393, c = 20.811, Z = 3; V = 1,946.73 Den(Calc)= 4.87
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.894(1), 3.43(0.9), 1.981(0.75),

Physical Properties of Senaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 5.3
Help on Diaphaneity: Diaphaneity: Subopaque to Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: brownish black

Optical Properties of Senaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.091 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.187 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.308,KPDmeas= 0.283,KC= 0.2594
Ncalc = 2.26 - 2.37
Help on Optical Data: Optical Data: Uniaxial (-), e=2.5.

Calculated Properties of Senaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.94 gm/cc
note: Specific Gravity of Senaite =5.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PESenaite = 192.85 barns/electron
U=PESenaite x rElectron Density= 953.07 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Senaite is Not Radioactive

Senaite Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.05)Dana Type
  (08.05.01)Crichtonite group (ABC18 T2 O38) Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3 Cleusonite! Pb(U,U)(Ti,Fe,Fe)20(O,OH)38 R 3 3 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 Senaite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Senaite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info

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Dana No: Strunz No: 04.CC.40





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