Saliotite

Saliotite
General
CategorySilicate mineral
Formula
(repeating unit)
(Li,Na)Al3(AlSi3O10)(OH)5
IMA symbolSal
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
LusterPearly
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

Saliotite is a rare colorless to pearl white phyllosilicate mineral in the smectite group with formula (Li,Na)Al3(AlSi3O10)(OH)5. 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.

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.


This page was last updated at 2024-04-18 05:08 UTC. Update now. View original page.

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