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heulandite
[ hyoo-luhn-dahyt ]
noun
- a white or transparent, colorless mineral of the zeolite family, hydrous calcium aluminum silicate, CaAl 2 Si 7 O 18 â‹…6±á 2 O, occurring in basic volcanic rocks in the form of crystals with a pearly luster.
heulandite
/ ˈ³óÂá³Ü˱ôÉ™²ÔËŒ»å²¹Éª³Ù /
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
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˜yÐÄvlog History and Origins
Origin of heulandite1
1815–25; named after Henry Heuland, 19th-century English mineral collector; -ite 1
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˜yÐÄvlog History and Origins
Origin of heulandite1
C19: named after H. Heuland, 19th-century English mineral collector; see -ite 1
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Example Sentences
Examples have not been reviewed.
The two minerals may, however, be readily distinguished by the fact that in heulandite the acute positive bisectrix of the optic axes emerges perpendicular to the cleavage.
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