Landauite Mineral Data

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General Landauite Information

Chemical Formula:

NaMnZn2(Ti,Fe+++)6Ti12O38

Composition:

Molecular Weight = 1,730.91 gm

Potassium 0.45 % K 0.54 % K₂O

Sodium 0.93 % Na 1.25 % Na₂O

Titanium 43.43 % Ti 72.45 % TiO₂

Manganese 3.17 % Mn 4.10 % MnO

Zinc 8.69 % Zn 10.81 % ZnO

Iron 5.81 % Fe 7.47 % FeO

Lead 2.39 % Pb 2.58 % PbO

Oxygen 35.12 % O

______ ______

100.00 % 99.21 % = TOTAL OXIDE

Empirical Formula:

Na_0.7K_0.2Pb_0.2Mn²⁺Zn_2.3Ti_15.7Fe²⁺_1.8O₃₈

Environment:

Accessory mineral in albite veins cutting syenite pegmatites.

IMA Status:

Approved IMA 1966

Locality:

Burpala massif, 120 km norht of Lake Baikal, eastern Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Lev Davidovich Landau (1908-1968), noted Russian physicist.

Name Pronunciation:

Landauite + Pronunciation

Synonym:

ICSD 200416

PDF 18-672

Landauite Image

Images:

Landauite

Comments: Black granular landauite in matrix.
Location: Northwest Territories, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Landauite Crystallography

Axial Ratios:

a:c = 1:2.00366

Cell Dimensions:

a = 10.366, c = 20.77, Z = 3; V = 1,932.81 Den(Calc)= 4.46

Crystal System:

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

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

By Intensity(I/I_o): 2.83(1), 2.11(0.9), 1.78(0.8),

Crystal Structure:

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Grey I E , Gatehouse B M , The Canadian Mineralogist , 16 (1978) p.63-68, The crystal structure of landauite, Na[MnZn2(Ti,Fe)6Ti12]O38

Physical Properties of Landauite

Cleavage:

None

Color:

Black.

Density:

4.42

Diaphaneity:

Subtranslucent to Opaque

Fracture:

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

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

7.5 - Garnet

Luster:

Sub Metallic

Streak:

gray

Optical Properties of Landauite

Dichroism (e):

bottle green.

Dichroism (w):

green.

Gladstone-Dale:

CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3095,KPDmeas= 0.3123,KC= 0.3308
Ncalc = 2.46 - 2.48

Optical Data:

Uniaxial (-), e=2.373, w=2.388, bire=0.0150.

Calculated Properties of Landauite

Electron Density:

Bulk Density (Electron Density)=4.18 gm/cc
note: Specific Gravity of Landauite =4.42 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Landauite= 53.26 barns/electron
U=PE_Landauite x r_electron= 222.55 barns/cc.

Radioactivity:

GRapi = 6.17 (Gamma Ray American Petroleum Institute Units)
Concentration of Landauite per GRapi unit = 16.22 (%)

Estimated Radioactivity from Landauite - barely detectable

Landauite Classification

Dana Class:

08.05.01.01 (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 Landauite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Landauite :
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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Ask about Landauite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Landauite Specimen Label here :

Landauite

NaMnZn2(Ti,Fe+++)6Ti12O38
Dana No: 08.05.01.01 Strunz No: 04.CC.40
Locality:

Notes: