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
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Examples from the Web for heulandite
Isomorphous with heulandite is the strontium and barium zeolite brewsterite, named after Sir David Brewster.
Heulandite is distinguished from stilbite by its crystals and perfect solubility; from apopholite by form of crystals.
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