- 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. 2018
Examples from the Web for heulandite
Heulandite is distinguished from stilbite by its crystals and perfect solubility; from apopholite by form of crystals.
Isomorphous with heulandite is the strontium and barium zeolite brewsterite, named after Sir David Brewster.
- 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
C19: named after H. Heuland, 19th-century English mineral collector; see -ite 1