IMA symbolAli
Strunz classification9.EC.60
Crystal systemHexagonal
Unknown space group
Unit cella = 5.216, c = 24.6 [Å]; Z = 1
ColorColorless, pale yellow or green.
Crystal habitPlaty
Mohs scale hardness1–2
LusterEarthy (dull)
Refractive index1.558–1.567

Aliettite is a complex phyllosilicate mineral of the smectite group with a formula of (Ca0.2Mg6(Si,Al)8O20(OH)4·4H2O) or [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe2+)23(Si,Al)4O10(OH)2·n(H2O).

It is a soft, colorless to pale yellow or green earthy mineral which crystallizes in the monoclinic system as minute tabular to platy crystals.

It was first described in 1968 for an occurrence in Monte Chiaro, Albareto, Parma Province, Emilia-Romagna, Italy and named for the Italian mineralogist Andrea Alietti (born 1923).

It occurs in serpentinized ophiolites and their residual soil. It also occurs in altered dolomite. Associated minerals include talc, chlorite, serpentine and calcite. In addition to the type locality in Italy it has been reported from Kinshasa, Katanga; the Chelyabinsk Oblast of the southern Urals and the Turii alkaline Massif of the Kola Peninsula in Russia; the Zirabulak Mountains of Uzbekistan; and the Goldstrike Mine of Eureka County, Nevada, US.

This page was last updated at 2024-04-17 21:42 UTC. Update now. View original page.

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