Heulandite is a mineral from the group of zeolites. Discovered in Norway, most common in India, in Russia the best collection specimens are found in the Nizhnyaya Tunguska river basin.
You can see heulandite stone for sale and buy it in the Minerals of Russia online store.
General | |
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Category | Zeolites (tectosilicates) |
Formula (repeating unit) |
(Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O |
IMA symbol | Hul |
Strunz classification | 9.GE.05 |
Crystal system | Monoclinic More than one space group |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Identification | |
Colour | colourless, yellow, green, white, pale pink |
Crystal habit | tabular, parallel aggregates |
Cleavage | perfect basal |
Mohs scale hardness | 3.5-4 |
Lustre | pearly, vitreous |
Streak | white |
Diaphaneity | transparent to translucent |