Omarolluk
A variety of Sedimentary
What is Omarolluk?
Omarolluk is a type of glacial erratic composed of dark siliceous greywacke with hemispherical voids. The hemispherical voids arise from the selective dissolution of carbonate concretions within the greywacke. Originating from the Proterozoic Omarolluk Formation in the Belcher Islands of Hudson Bay, Canada, Omarolluks were transported by glaciers across central Canada and into the United States, making them valuable in understanding glacier movement.
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Omarolluk Localities Map
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Quick Facts
Physical Properties
- Color
- Dark grey, black, brown, etc.
- Hardness (Mohs)
- 6 - 7
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