Senaite Mineral Data + Say SENAITE

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 Synonym: Synonym: ICSD 84
  PDF 20-1048
 

Senaite Image

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Senaite

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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Senaite

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 - RhombohedralH-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),
Click Here for Large Senaite Structure Window Crystal Structure:

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Armbruster T , Kunz M , European Journal of Mineralogy , 2 (1990) p.163-170, Cation arrangement in a unusual uranium-rich senaite: crystal, structure study at 130 K

 

Physical Properties of Senaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 5.3
Help on Diaphaniety: Diaphaniety: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=2.5.
 

Calculated Properties of Senaite

Help on Electron Density: Electron Density:

relectron=4.94 gm/cc
note: rSenaite =5.30 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.06105
Boson Index = 0.93895
Help on Photoelectric: Photoelectric:

PESenaite = 192.85 barns/electron
U=PESenaite x relectron= 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: 8.5.1.4 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.5)Dana Type
  (8.5.1)Crichtonite group (ABC18 T2 O38)
 
8.5.1.1 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
8.5.1.2 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
8.5.1.3 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
8.5.1.4 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 
8.5.1.5 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
8.5.1.6 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
8.5.1.7 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
8.5.1.8 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
8.5.1.9 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
8.5.1.10 Cleusonite! Pb(U,U)(Ti,Fe2,Fe3)20(O,OH)38 R 3 3
 
8.5.1.11 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
Help on  Strunz Class: Strunz Class: IV/C.09-80 IV - Oxides
  IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)
  IV/C.09 - Crichtonite group
 
IV/C.09-10 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
IV/C.09-20 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
IV/C.09-30 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
IV/C.09-40 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
IV/C.09-45 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
IV/C.09-50 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
IV/C.09-60 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
IV/C.09-62 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
 
IV/C.09-70 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
IV/C.09-80 Senaite Pb(Ti,Fe,Mn)21O38 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 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 - HyperPhysics 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST 16 -École des Mines de Paris

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Senaite

Pb(Ti,Fe,Mn)21O38
Dana No: 8.5.1.4 Strunz No: IV/C.09-80
Locality:

 

Notes:

 

 
   
 
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