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Webster 1913 Edition

(hăl-loi′sīt)

Noun.

[Named after

Omalius d’

Halloy

(Min.)

A claylike mineral, occurring in soft, smooth, amorphous masses, of a whitish color.

halloysite ‎(countable and uncountable, plural halloysites)

(mineralogy) A monoclinic-domatic mineral containing aluminum, hydrogen, oxygen, and silicon.

halloysite Barthelmy, David (accessed 29 August 2016) Webmineral Mineralogy Database