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Updated: May 8, 2025
Heulandite is distinguished from stilbite by its crystals and perfect solubility; from apopholite by form of crystals. In the next part of this paper I will commence with Staten Island. July 1, 1882.
To keep this mineral when in crystals from crumbling upon exposure it may be dipped in a thin mastic varnish or in a gum-arabic solution. Heulandite. This rare mineral has been found under the same conditions as laumonite in Shaft No. 2, but it is seldom to be met with, and then in small crystals. It is of a pure white color, sometimes transparent.
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