Lakargiite Mineral Data

General Lakargiite Information

Chemical Formula:

CaZrO3

Composition:

Molecular Weight = 177.87 gm

Strontium 0.10 % Sr 0.12 % SrO

Calcium 22.19 % Ca 31.05 % CaO

Lanthanum 0.47 % La 0.55 % La₂O₃

Cerium 0.47 % Ce 0.55 % Ce₂O₃

Yttrium 0.10 % Y 0.13 % Y₂O₃

Hafnium 0.80 % Hf 0.95 % HfO₂

Thorium 0.78 % Th 0.89 % ThO₂

Magnesium 0.01 % Mg 0.02 % MgO

Zirconium 29.85 % Zr 40.32 % ZrO₂

Scandium 0.25 % Sc 0.39 % Sc₂O₃

Uranium 1.87 % U 2.25 % UO₃

Tantalum 0.10 % Ta 0.12 % Ta₂O₅

Titanium 4.74 % Ti 7.90 % TiO₂

Niobium 0.37 % Nb 0.52 % Nb₂O₅

Aluminum 0.02 % Al 0.03 % Al₂O₃

Vanadium 0.09 % V 0.13 % V₂O₃

Chromium 0.23 % Cr 0.34 % Cr₂O₃

Iron 1.73 % Fe 2.47 % Fe₂O₃

Silicon 0.02 % Si 0.03 % SiO₂

Tin 8.74 % Sn 11.10 % SnO₂

Neodymium 0.08 % Nd 0.09 % Nd₂O₃

Oxygen 26.99 % O

______ ______

100.00 % 99.96 % = TOTAL OXIDE

Empirical Formula:

Ca_0.98Sr_0.002Mg_0.001Y_0.002Ce_0.006La_0.006Nd_0.001Th_0.006Zr_0.58Hf_0.008Sn_0.13Ti_0.17Si_0.001Fe³⁺_0.05 Nb_0.007Ta_0.001U_0.01Sc_0.01Cr_0.008O₃

Environment:

Accessory mineral in high-temperature skarns occurring in sedimentary carbonate xenoliths in ignimbrite confined to the Upper-Chegem (Verkhniy Chegem) volcanic structure. Perovskite group.

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Verkhn’echegemskiy volcanic structure, Kabardino-Balkaria, North Caucasus, Russia Link to MinDat.org Location Data.

Name Origin:

Named for the locality at Lakargi Mountain.

Synonym:

IMA2007-014

Lakargiite Image

Images:

Lakargiite

Comments: BSE image of a pseudomorph of lakargiite after zircon. Cus = cuspidine, Lak = lakargiite, Zr-grt = kimzeyite-like mineral, Zrn = zircon, Bgd = baghdadite-like mineral, and Ap = apatite. (AmMin, v93:1905).
Location: North Caucasus, Kabardino-Balkaria, Russia. Scale: See Image.
© American Mineralogist

Lakargiite Crystallography

Axial Ratios:

a:b:c =0.9721:1:1.3928

Cell Dimensions:

a = 5.556, b = 5.715, c = 7.96, Z = 4; V = 252.75 Den(Calc)= 4.67

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 2.836(1), 4.013(0.35), 2.006(0.29),2.881(0.25), 1.622(0.24), 2.796(0.22), 1.654(0.17), 4.009(0.16),

Physical Properties of Lakargiite

Cleavage:

{110} Distinct, {001} Distinct

Color:

Red brown, Yellowish, Almost clear.

Diaphaneity:

Translucent to Subopaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

8-8.5 - Between Topaz and Chrysoberyl

Luster:

Vitreous - Adamantine

Streak:

light creamy brown

Optical Properties of Lakargiite

Gladstone-Dale:

CI calc= -0.088 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2355,KC= 0.2165
Ncalc = 2.01

Optical Data:

Biaxial (+), a=2.1, b=2.1, g=2.1, bire=0.0000

RL Color:

Red-brown and pink internal reflections.

Calculated Properties of Lakargiite

Electron Density:

Bulk Density (Electron Density)=4.36 gm/cc
note: Specific Gravity of Lakargiite =4.67 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Lakargiite= 149.72 barns/electron
U=PE_Lakargiite x r_electron= 652.60 barns/cc.

Radioactivity:

GRapi = 164,640.87 (Gamma Ray American Petroleum Institute Units)
Concentration of Lakargiite per GRapi unit = 6.07 (PPM)

Lakargiite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 184.75 ± 46.19 grams of pure Lakargiite .

**Estimated Radioactivity from Lakargiite** - strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.42 cm	3,704,238	1.00E-04	164,640.87	54.13
100 gm / 3.45 cm	370,424	1.00E-05	16,464.09	5.41
10 gm / 1.60 cm	37,042	1.00E-06	1,646.41	0.54
1 gm / 7.42 mm	3,704	1.00E-07	164.64	0.05
0.1 gm / 3.45 mm	370	1.00E-08	16.46	0.01
0.01 gm / 1.60 mm	37	1.00E-09	1.65	0.00
0.001 gm / 0.74 mm	4	1.00E-10	0.16	0.00

Weight of pure Lakargiite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.67 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem

Lakargiite Classification

Dana Class:

04.03.03.08 (04)Simple Oxides

(04.03)with a cation charge of 3+ (A+++2 O3)

(04.03.03)Perovskite Group

04.03.03.01 Perovskite CaTiO3 P nma 2/m 2/m 2/m

04.03.03.02 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m

04.03.03.03 Loparite-(Ce) (Ce,Na,Ca)2(Ti,Nb)2O6 P m3m 4/m 3 2/m

04.03.03.04 Lueshite NaNbO3 P 222₁ 2 2 2

04.03.03.05 Tausonite SrTiO3 P m3m 4/m 3 2/m

04.03.03.06 Isolueshite! (Na,La,Ca)(Nb,Ti)O3 P m3m 4/m 3 2/m

04.03.03.07 Barioperovskite! BaTiO3 Amm2 mm2

04.03.03.08 Lakargiite! CaZrO3 P nma 2/m 2/m 2/m

Strunz Class:

04.CC.30 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.30 Natroniobite NaNbO3 Mono

04.CC.30 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m

04.CC.30 Lueshite NaNbO3 P 222₁ 2 2 2

04.CC.30 Perovskite CaTiO3 P nma 2/m 2/m 2/m

04.CC.30 Barioperovskite! BaTiO3 Amm2 mm2

04.CC.30 Lakargiite! CaZrO3 P nma 2/m 2/m 2/m

Other Lakargiite Information

References:

NAME( AmMin, v93:1903) PHYS. PROP.(AmMin, v93:1903) OPTIC PROP.(AmMin, v93:1903)

See Also:

Links to other databases for Lakargiite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Lakargiite Specimen Label here :

Lakargiite

CaZrO3
Dana No: 04.03.03.08 Strunz No: 04.CC.30
Locality:

Notes: