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Lautarite

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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.
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[OH|IO
 
3
]
29.2Bellingerite
Cu
 
3
(IO
 
3
)
 
6
·2H
 
2
O
29.4Brüggenite
Ca(IO
 
3
)
 
2
·H
 
2
O
29.5Dietzeite
Ca
 
2
[CrO
 
4
|(IO
 
3
)
 
2
] · H
 
2
O
29.6Seeligerite
Pb
 
3
IO
 
4
Cl
 
3
29.7Schwartzembergite
Pb
2+
5
I
3+
 
O
 
6
H
 
2
Cl
 
3
29.8Hectorfloresite
Na
 
9
[IO
 
3
|(SO
 
4
)
 
4
]

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

    (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.
    Mineral and/or Locality
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