Aliettite

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Aliettite
Aliettite-87733.jpg
Aliettite
General
Category Phyllosilicates
Strunz classification 09.EC.60
Unit cell a = 5.216 Å, b = 24.6 Å, Z = 1
Identification
Color Colorless, pale yellow or green.
Crystal habit Platy
Crystal system Monoclinic
Mohs scale hardness 1–2
Luster Earthy (dull)
Streak White
Diaphaneity Translucent
Refractive index 1.558–1.567
References [1][2][3]

Aliettite is a complex phyllosilicate mineral of the smectite group with a formula of (Ca0.2Mg6(Si,Al)8O20(OH)4·4H2O)[1] or [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe2+)2–3(Si,Al)4O10(OH)2·n(H2O).[2][3]

It is a soft, colorless to pale yellow or green earthy mineral which crystallizes in the monoclinic system as minute tabular to platy crystals.[1]

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).[1]

It occurs in serpentinized ophiolites and their residual soil. It also occurs in altered dolostone. Associated minerals include talc, chlorite, serpentine and calcite.[3] In addition tot the type locality in Italy it has been reported from Kinshasa, Katanga;[3] 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, USA.[1]

References[edit]

  1. ^ a b c d e Aliettite. Mindat.org
  2. ^ a b Aliettite. Webmineral
  3. ^ a b c d Aliettite. Handbook of Mineralogy