Aliettite

Aliettite (Ca0.2Mg6(Si,Al)8O20(OH)4·4H2O) is a mineral named after the Italian mineralogist Andrea Alietti.
See more at Wikipedia.org...

General Information:
 Chemical Formula:
(Mg,Fe++)3Si4O10(OH)2(Ca,Na)0.2-0.3(Mg,Fe++)3(Si,Al)4O10(OH)2·4(H2O)
 Environment:
Low temperature environments in ancient lake sediments. Also found in low-grade Mg-rich metamorphic rocks.
 IMA Status:
Approved IMA
 Locality:
TL: Italy, Monte Chiaro, Taro valley. Amargosa desert region, Death Valley, California, USA.
 Name Origin:
Named for Andrea Alietti (1923-), clay mineralogist.
Physical Properties:
 Cleavage:
[???] Perfect
 Color:
white, dark green, or buff.
 Habits:
Microscopic Crystals - Crystals visible only with microscopes., Platy - Sheet forms (e.g. micas).,
 Hardness:
1-2 - Between Talc and Gypsum
 Luster:
Earthy (Dull)
 Streak:
white
More details...