Landauite Mineral Data

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Search for Landauite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Landauite :

A Bijoux Google Search for Landauite
Adam's Minerals Google Search for Landauite
Cape Minerals Google Search for Landauite
Dakota Matrix Minerals Google Search for Landauite
Excalibur Mineral Corp. Google Search for Landauite
Exceptional Minerals Google Search for Landauite
John Betts Fine Minerals Search for Landauite
McDougall Minerals Google Search for Landauite
Mineral News Website Link
Rock and Mineral Shows Google Search for Landauite
Weinrich Minerals, Inc. Google Search for Landauite

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
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: