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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+)2–3(Si,Al)4O10(OH)2·n(H2O).

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Mineralogy Database Dictionary

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General Information:
 Chemical Formula:
Low temperature environments in ancient lake sediments. Also found in low-grade Mg-rich metamorphic rocks.
 IMA Status:
Approved IMA
TL: Italy, Monte Chiaro, Taro valley. Amargosa desert region, Death Valley, California, USA.
 Name Origin:
Named for Andrea Alietti (1923-), clay mineralogist.
Physical Properties:
[???] Perfect
white, dark green, or buff.
Microscopic Crystals - Crystals visible only with microscopes., Platy - Sheet forms (e.g. micas).,
1-2 - Between Talc and Gypsum
Earthy (Dull)
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