Senaite Mineral Data

Senaite Mineral Data +

General Senaite Information

Chemical Formula:

Pb(Ti,Fe,Mn)21O38

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

Empirical Formula:

PbTi₁₀Fe²⁺₇Mn²⁺₄O₃₈

IMA Status:

Valid Species (Pre-IMA) 1898

Locality:

Dattos, Curralinho, and other localities near Diamantina, Minas Gerias, Brazil. Link to MinDat.org Location Data.

Name Origin:

Named for Joaquim de Costa Sena, Esola de Minas, Ouro Preto, Brazil.

Synonym:

ICSD 84

PDF 20-1048

Senaite Image

Images:

Senaite

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

Images:

Senaite

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

Senaite Crystallography

Axial Ratios:

a:c = 1:2.0024

Cell Dimensions:

a = 10.393, c = 20.811, Z = 3; V = 1,946.73 Den(Calc)= 4.87

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.894(1), 3.43(0.9), 1.981(0.75),

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

Cleavage:

None

Color:

Black.

Density:

5.3

Diaphaniety:

Subopaque to Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Sub Metallic

Streak:

brownish black

Optical Properties of Senaite

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

Optical Data:

Uniaxial (-), e=2.5.

Calculated Properties of Senaite

Electron Density:

r_electron=4.94 gm/cc
note: r_Senaite=5.30 gm/cc.

Fermion Index

Fermion Index = 0.06105
Boson Index = 0.93895

Photoelectric:

PE_Senaite= 192.85 barns/electron
U=PE_Senaite x r_electron= 953.07 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Senaite is Not Radioactive

Senaite Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Senaite

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

Notes: