Heulandite
UNB-2016-0429Minerals » Tectosilicates » Zeolite
Description
White vitreous Heulandite crystals infilling volcanic cavities.
Heulandite ((Ca, Na)(Al2, Si7, O18) x 6H2O) can be white, greyish, colourless, greenish or red in colour. Lustre is vitreous but pearly on the cleavage and streak is colourless. Hardness is 3 1/2 to 4 and cleavage is perfect in one direction. Heulandite usually occurs as coffin-shaped crystals or tabular single crystals. Heulandite can also be radiating aggregates with nearly parallel crystals but can also be foliated, globular or granular.
Specifications
| Object name | Heulandite |
|---|---|
| ID | UNB-2016-0429 |
| Legal status | Permanent collection |
| Category | Mineral |
| Classification | Mineral group: Tectosilicates Sub-group: Zeolite |
| Composition |
|
| Age | Eon: Phanerozoic Era: Mesozoic Period: Triassic |
| Numeric age | 251.902 Mya |
| Origin | Herrington Cove, Grand Manan, New Brunswick, Canada |
| Partial | No |
| Measurements |
|
Map of Origin
Publications
- McHone, J.G. and McHone, N.W., 2012, Grand Manan Geology: Excursions in Island Natural History: Stones2Gems Publications, Grand Manan, New Brunswick, 50 p.
- Chesterman, C.W. 1979. Audubon Society, Field Guide to North American Rocks and Minerals. Knopf.