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Formula: Al2Si2O5(OH)4
Phyllosilicate (sheet silicate), kaolinite group,
paramorph of dickite,
halloysite-7Å and kaolinite
Specific gravity: 2.6
Hardness: 2 to 2½
Streak: White
Colour: White, grey, yellowish, brownish
Environments
Nacrite is of hydrothermal origin, and occurs associated with kaolinite,
dickite, mica and
quartz
(HOM).
Localities
The type locality is the Einigkeit mine, Brand-Erbisdorf, Mittelsachsen, Saxony, Germany.
At the Tracy Mine, Negaunee, Marquette county, Michigan, USA, nacrite has been found in
iron ore
(AM 48.1196-1209).
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