NaCa2Al5Si13O36 14H2O, Hydrated sodium calcium aluminum silicate
 
At one time heulandite and stilbite were considered to be identical minerals.  After they were found to be two separate species, in 1818, the name desmine ("a bundle") was proposed for stilbite, and this name is still employed in Germany.  The English name "stilbite" is from the Greek stilbein = to shine, because of the pearly luster of the {010} faces.
 
Stilbite is a common and perhaps the most popular zeolite mineral ...

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