Amygdaloidal cavities in basalts and similar rocks. Redefined from stilbite by IMA zeolite committee.
IMA Status:
Valid Species (Pre-IMA) 1801
Locality:
Ha�y mentioned occurrences in Iceland, Andreasberg in Harz, Alpes Dauphinoises and Norway, but no clear type-locality. Link to MinDat.org Location Data.
Name Origin:
From the Greek stilbe - "luster" in allusion to the pearly to vitreous luster. Ca modifier added by zeolite committee.