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Lautarite

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Formula:
Ca(IO3)2
Colour:
Colourless; yellowish
Hardness:
3½ - 4
Specific Gravity:
4.59
Crystal System:
Monoclinic
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.


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Classification of LautariteHide

Approved, 'Grandfathered' (first described prior to 1959)
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

Physical Properties of LautariteHide

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

Optical Data of LautariteHide

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 LautariteHide

Formula:
Ca(IO3)2

Crystallography of LautariteHide

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

Type Occurrence of LautariteHide

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

Synonyms of LautariteHide

Other Language Names for LautariteHide

German:Lautarit
Spanish:Lautarita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Nitratine2 photos of Lautarite associated with Nitratine on mindat.org.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

29.1SalesiteCu(IO3)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
29.2BellingeriteCu3(IO3)6 · 2H2OTric. 1 : P1
29.4BrüggeniteCa(IO3)2 · H2OMon.
29.5DietzeiteCa2(IO3)2(CrO4) · H2OMon. 2/m : P21/b
29.6SeeligeritePb3(IO3)OCl3Orth. mm2 : Cmm2
29.7SchwartzembergitePb5H2(IO2)O4Cl3Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
29.8HectorfloresiteNa9(SO4)4(IO3)Mon. 2/m : P21/b

Other InformationHide

Notes:
Slightly soluble in water. Readily soluble in HCl with evolution of Cl.
Health Risks:
Emits toxic chlorine gas when placed in contact with HCl.

References for LautariteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 LautariteHide

Localities for LautariteHide

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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