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Lautarite

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Formula:
Ca(IO3)2
System:
Monoclinic
Colour:
Colourless; yellowish
Hardness:
3½ - 4
Name:
After the type locality Oficina Lautaro, Antofagasta, Chile. (Lautaro is also the name of the Mapuche leader who resisted the Spanish conquest of Chile.)
This page provides mineralogical data about Lautarite.

Classification of Lautarite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
4.KA.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
K : Iodates: Trigonal [IO3] pyramids (mostly).
A : Iodates without additional anions, without H2O
Dana 7th ed.:
21.1.1.1
21.1.1.1

21 : NORMAL IODATES
1 : Miscellaneous
29.3

29 : Iodates
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Type Occurrence of Lautarite

General Appearance of Type Material:
Crystals coating fractures or embedded in gypsum bands.
Year of Discovery:
1891
Geological Setting of Type Material:
Sedimentary nitrate deposits.
Associated Minerals at Type Locality:

Physical Properties of Lautarite

Diaphaneity (Transparency):
Transparent
Colour:
Colourless; yellowish
Hardness (Mohs):
3½ - 4
Cleavage:
Distinct/Good
On {011} good; on {100} and {110} in traces.
Density:
4.59 g/cm3 (Measured)    4.48 g/cm3 (Calculated)

Crystallography of Lautarite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 7.28Å, b = 11.3Å, c = 7.14Å
β = 106.36°
Ratio:
a:b:c = 0.644 : 1 : 0.632
Unit Cell Volume:
V 563.58 ų (Calculated from Unit Cell)
Morphology:
Crystals short prismatic [001]. Faces in zone [001] rounded and striated [001]. Stellate aggregates common.

Optical Data of Lautarite

Type:
Biaxial (+)
RI values:
nα = 1.792 nβ = 1.840 nγ = 1.888
2V:
Measured: 90° , Calculated: 86°
Max Birefringence:
δ = 0.096
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v perceptible

Chemical Properties of Lautarite

Formula:
Ca(IO3)2
Essential elements:
All elements listed in formula:

Relationship of Lautarite to other Species

29.1SalesiteCu(IO3)(OH)
29.2BellingeriteCu3(IO3)6 · 2H2O
29.4BrüggeniteCa(IO3)2 · H2O
29.5DietzeiteCa2(IO3)2(CrO4) · H2O
29.6SeeligeritePb3(IO3)OCl3
29.7SchwartzembergitePb5H2(IO2)O4Cl3
29.8HectorfloresiteNa9(SO4)4(IO3)

Other Names for Lautarite

Name in Other Languages:
German:Lautarit
Spanish:Lautarita

Other Information

Other Information:
Slightly soluble in water. Readily soluble in HCl with evolution of Cl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Lautarite

Reference List:
Dietze (1891) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 19: 447.

Osann (1894) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 23: 586.

Gossner and Mussgnug (1930) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 75: 410.

Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 140.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 312-313.

Acta Crystallographica (1978): B34: 84-88.

Internet Links for Lautarite

Localities for Lautarite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Chile
 
  • Antofagasta Region
    • Antofagasta Province
      • Reventon District
        • Paposo
      • Taltal
        • Oficina Lautaro
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 313; Acta Cryst. B34 (1978), 84.
Mineral and/or Locality  
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