Lautarite Mineral Data

General Lautarite Information

Chemical Formula:

Ca(IO3)2

Composition:

Molecular Weight = 389.88 gm

Calcium 10.28 % Ca 14.38 % CaO

Iodine 65.10 % I 85.62 % I₂O₅

Oxygen 24.62 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca(IO₃)₂

Environment:

Coating fractures or embedded in gypsum in the nitrate deposits.

IMA Status:

Valid Species (Pre-IMA) 1891

Locality:

Pampa del Pique III, about one km north of Oficina Lautaro, Taltal district, Antofagasta, Chile. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Lautarite + Pronunciation

Synonym:

ICSD 1391

PDF 28-221

Lautarite Image

Images:

Lautarite

Comments: Sealed specimen jar with lautarite with nitratine..
Location: Atacama Desert, Chile. Scale: 3 cm Tall.
© Adam Larson

Lautarite Crystallography

Axial Ratios:

a:b:c =0.644:1:0.6323

Cell Dimensions:

a = 7.28, b = 11.304, c = 7.148, Z = 4; beta = 106.36° V = 564.41 Den(Calc)= 4.59

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 3.156(1), 3.428(0.85), 3.493(0.65),

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Forms: ( 0 1 0) ( 0 1 1) ( 1 1 0) ( 1 2 0) ( 0 0 1)

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Physical Properties of Lautarite

Cleavage:

{011} Good, {100} Indistinct, {110} Indistinct

Color:

Colorless, Yellowish, Light yellow.

Density:

4.519

Diaphaneity:

Transparent

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lautarite

Gladstone-Dale:

CI meas= 0.057 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.072 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.183,KPDmeas= 0.1859,KC= 0.1972
Ncalc = 1.89 - 1.9

Optical Data:

Biaxial (+), a=1.792, b=1.84, g=1.888, bire=0.0960, 2V(Calc)=86, 2V(Meas)=90.

Calculated Properties of Lautarite

Electron Density:

Bulk Density (Electron Density)=4.03 gm/cc
note: Specific Gravity of Lautarite =4.52 gm/cc.

Fermion Index:

Fermion Index = 0.0002569578
Boson Index = 0.9997430422

Photoelectric:

PE_Lautarite= 247.03 barns/electron
U=PE_Lautarite x rElectron Density= 996.41 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lautarite is Not Radioactive

Lautarite Classification

Dana Class:

21.01.01.01 (21)Iodates - Anhydrous and Hydrated

(21.01)with miscellaneous formulae

(21.01.01)Dana Group

21.01.01.01 Lautarite Ca(IO3)2 P 2₁/n 2/m

Strunz Class:

04.KA.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.K - Iodates

04.KA -Iodates without additional anions, without H2O

04.KA.05 Lautarite Ca(IO3)2 P 2₁/n 2/m

Other Lautarite 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 Lautarite :
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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Print or Cut-and-Paste your Lautarite Specimen Label here :

Lautarite

Ca(IO3)2
Dana No: 21.01.01.01 Strunz No: 04.KA.05
Locality:

Notes:

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