Lindsleyite Mineral Data

Lindsleyite Mineral Data +

General Lindsleyite Information

Chemical Formula:

(Ba,Sr)(Ti,Cr,Fe,Mg)21O38

Composition:

Molecular Weight = 1,763.22 gm

Barium 5.84 % Ba 6.52 % BaO

Strontium 1.24 % Sr 1.47 % SrO

Magnesium 0.69 % Mg 1.14 % MgO

Titanium 35.30 % Ti 58.89 % TiO₂

Chromium 17.69 % Cr 23.14 % CrO

Iron 4.75 % Fe 6.11 % FeO

Oxygen 34.48 % O

______ ______

100.00 % 97.28 % = TOTAL OXIDE

Empirical Formula:

Ba_0.75Sr_0.25Ti₁₃Cr₆Fe²⁺_1.5Mg_0.5O₃₈

Environment:

In kimberlite and peridotite nodules.

IMA Status:

Approved IMA 1983

Locality:

DeBeers mine, Kimberley, Cape Province, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for Donald H. Lindsley (1934-), mineralogist, Department of Earth Sciences, State University of New York at Stony Brook.

Synonym:

ICSD 81584

PDF 37-421

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Lindsleyite Crystallography

Axial Ratios:

a:c = 1:1.97878

Cell Dimensions:

a = 10.37, c = 20.52, Z = 3; V = 1,911.02 Den(Calc)= 4.60

Crystal System:

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

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

By Intensity(I/I_o): 1.59(1), 1.8(1), 2.13(1),

Crystal Structure:

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Peterson R C , Grey I E , The Canadian Mineralogist , 33 (1995) p.1083-1089, Preparation and structure refinement of synthetic Ti-containing, lindsleyite, BaMn3Ti18O38

Physical Properties of Lindsleyite

Cleavage:

None

Color:

Black.

Density:

4.63

Diaphaniety:

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:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

7.5 - Garnet

Luster:

Metallic

Streak:

gray

Optical Properties of Lindsleyite

Optical Data:

Uniaxial (?).

NCalc= 2.39 - from Gladstone-Dale relationship (KC = 0.3024) where Ncalc=Dcalc*KC+1
NCalc= 2.4 - from Gladstone-Dale relationship (KC = 0.3024) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Weak, pale tan to brown.

RL Color:

Tan.

RL Pleochroism:

Weak, buff-white to tan.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Lindsleyite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	19.40	19.80
420 nm	19.00	19.20
440 nm	18.60	18.90
460 nm	18.10	18.40
480 nm	17.80	18.10
500 nm	17.50	17.80
520 nm	17.20	17.50
540 nm	17.10	17.30
560 nm	16.90	17.10
580 nm	16.70	17.00
600 nm	16.70	16.90
620 nm	16.60	16.90
640 nm	16.50	16.80
660 nm	16.50	16.90
680 nm	16.50	16.90
700 nm	16.50	16.90

**Calculated Relative Intensity Colors of Lindsleyite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	520%
R₁
R₂

Calculated Properties of Lindsleyite

Electron Density:

r_electron=4.33 gm/cc
note: r_Lindsleyite=4.60 gm/cc.

Fermion Index

Fermion Index = 0.07559
Boson Index = 0.92441

Photoelectric:

PE_Lindsleyite= 37.77 barns/electron
U=PE_Lindsleyite x r_electron= 163.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lindsleyite is Not Radioactive

Lindsleyite Classification

Dana Class:

8.5.1.8 (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.09-50 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 Lindsleyite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Lindsleyite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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Lindsleyite

(Ba,Sr)(Ti,Cr,Fe,Mg)21O38
Dana No: 8.5.1.8 Strunz No: IV/C.09-50
Locality:

Notes: