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Heulandite is named for an English mineral collector, John Henry Heuland. Heulandite is usually found in cavities of igneous rocks. Heulandite is a special type of tectosilicate called a zeolite consisting of hydrous calcium and aluminium silicate.
(Ca0,5Sr0,5NaK)4,5Al9Si27O7224H2O - Hydrated Calcium Sodium Aluminum Silicate
Class:
Subclass:
Group:
Colorless, white, yellowish, pinkish, red, brown
White
Vitreous to pearly
Transparent to translucent
2.1
3.5 - 4
Perfect
Uneven to conchoidal
Prismatic to tabluar crystals, granular, massive
Non-fluorescent
Frequency:
Abundant
Origin:
Hydrothermal in cavities in volcanic rocks, in the Alpine-type fissures, ore veins and sedimentary rocks, usually associated with calcite and other zeolites.
Occurence:
Nasik, India; New Jersey, USA; Teigarhorn, Iceland; Val di Fassa, Italy.
Application:
Chemical filter and as a mineral specimen.

 
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