Chemistry:Saliotite

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Saliotite
General
CategorySilicate mineral
Formula
(repeating unit)
(Li,Na)Al
3
(AlSi
3
O
10
)(OH)
5
Strunz classification9.EC.60
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupC2/m
Unit cella = 5.15 Å, b = 8.91 Å
c = 23.83 Å; β = 94.23°; Z = 4
Identification
ColorColorless to white
CleavagePerfect on {001}
Mohs scale hardness2 - 3
|re|er}}Pearly
StreakWhite
DiaphaneityTransparent
Specific gravity2.75
Optical propertiesBiaxial (-)
Refractive indexnα = 1.580 - 1.590 nβ = 1.580 - 1.590 nγ = 1.590 - 1.600
Birefringenceδ = 0.010
2V angle30° to 50°
References[1][2]

Saliotite is a rare colorless to pearl white phyllosilicate mineral in the smectite group with formula (Li,Na)Al
3
(AlSi
3
O
10
)(OH)
5
.[1] It is an ordered 1:1 interstratification of cookeite and paragonite. It has perfect cleavage, a pearly luster and leaves a white streak. Its crystal structure is monoclinic, and it is a soft mineral with a hardness rated 2-3 on the Mohs scale.[1][2]

Saliotite was first described in 1994 for an occurrence in an outcrop of high grade schist north of Almeria, Andalusia, Spain . It was named for French geologist Pierre Saliot.[1]

References

  1. 1.0 1.1 1.2 1.3 Saliotite data on Mindat
  2. 2.0 2.1 Saliotite data on Webmineral
  3. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode2021MinM...85..291W. 

External links