heulandite

[hyoo-luh n-dahyt]

noun

a white or transparent, colorless mineral of the zeolite family, hydrous calcium aluminum silicate, CaAl2Si7O18⋅6H2O, occurring in basic volcanic rocks in the form of crystals with a pearly luster.

Origin of heulandite

1815–25; named after Henry Heuland, 19th-century English mineral collector; see -ite¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for heulandite

Isomorphous with heulandite is the strontium and barium zeolite brewsterite, named after Sir David Brewster.
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4|Various
Heulandite is distinguished from stilbite by its crystals and perfect solubility; from apopholite by form of crystals.
Scientific American Supplement, No. 344, August 5, 1882|Various

British Dictionary definitions for heulandite

heulandite

noun

a white, grey, red, or brown zeolite mineral that consists essentially of hydrated calcium aluminium silicate in the form of elongated tabular crystals. Formula: CaAl 2 Si 7 O 18 .6H 2 O

Word Origin for heulandite

C19: named after H. Heuland, 19th-century English mineral collector; see -ite 1

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012