Saliotite
(Li,Na)Al3(AlSi3O10)(OH)5IMA symbol Sal[1] Strunz classification 9.EC.60 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group C2/m Unit cell a = 5.15 Å, b = 8.91 Å
c = 23.83 Å; β = 94.23°; Z = 4 Identification Color Colorless to white Cleavage Perfect on {001} Mohs scale hardness 2 - 3 Luster Pearly Streak White Diaphaneity Transparent Specific gravity 2.75 Optical properties Biaxial (-) Refractive index nα = 1.580 - 1.590 nβ = 1.580 - 1.590 nγ = 1.590 - 1.600 Birefringence δ = 0.010 2V angle 30° to 50° References [2][3] Micas Talcs Pyrophyllite series Kaolinites Serpentines Corrensites Smectites and vermiculite family Chlorites Allophanes Sepiolites Pyrosmalites Stilpnomelanes
(same H-M symbol)
c = 23.83 Å; β = 94.23°; Z = 4
Saliotite is a rare colorless to pearl white phyllosilicate mineral in the smectite group with formula (Li,Na)Al3(AlSi3O10)(OH)5.[2] 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.[2][3]
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.[2]
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b c d Saliotite data on Mindat
- ^ a b Saliotite data on Webmineral
External links
- Saliotite on euromin.w3sites.net (French)
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- Structural groups mainly; based on rruff.info/ima, modified
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