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Lautarite

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Big Photo

Yumbes Mine, Paposo, Reventon District, Antofagasta Province, Antofagasta Region, Chile
© 2009, JGW




Formula:
Ca(IO
 
3
)
 
2
System:MonoclinicColour: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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/L.01-10
Nickel-Strunz 10th (pending) edition ID: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 edition ID:21.1.1.1
Dana 8th edition ID:21.1.1.1

21 : NORMAL IODATES
1 : Miscellaneous
Hey's CIM Ref.:29.3

29 : Iodates
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Type Occurrence of Lautarite

Type Locality:Pampa del Pique III, Oficina Lautaro, Antofagasta Region, Chile
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:
Gypsum

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 (measured):4.59 g/cm3
Density (calculated):4.48 g/cm3

Crystallography of Lautarite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
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°
Maximum Birefringence:δ = 0.096

Chart 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(IO
 
3
)
 
2
Essential elements:Ca, I, O
All elements listed in formula:Ca, I, O

Relationship of Lautarite to other Species

Related Minerals - Hey's Index Grouping:

- +
29.1Salesite
Cu(IO
 
3
)(OH)
29.2Bellingerite
Cu
 
3
(IO
 
3
)
 
6
 · 2H
 
2
O
29.4Brüggenite
Ca(IO
 
3
)
 
2
 · H
 
2
O
29.5Dietzeite
Ca
 
2
(IO
 
3
)
 
2
(CrO
 
4
) · H
 
2
O
29.6Seeligerite
Pb
 
3
(IO
 
3
)OCl
 
3
29.7Schwartzembergite
Pb
 
5
H
 
2
(IO
 
2
)O
 
4
Cl
 
3
29.8Hectorfloresite
Na
 
9
(SO
 
4
)
 
4
(IO
 
3
)

Other Names for Lautarite

Synonyms:
Calcium Chromiodate
Other Languages:
German:Lautarit
Russian:Лаутарит
Spanish:Lautarita

Other Information

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

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

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    • Localities for Lautarite

    Hide Locality List
    (TL) indicates type locality. ? 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
      • 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.
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