Alkaline Rocks and Carbonatites of the World

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Lake Harbour

stripes

Occurrence number: 
031-00-044
Country: 
Canada
Region: 
Northwest Territories, Baffin Island
Location: 
Longitude: -71.07, Latitude: 62.08

Two occurrences of lapis lazuli are located near Lake Harbour at the southern end of Baffin Island. They are present as conformable lenses, up to 168 m long and 8 m wide, within tightly folded synforms of marble. The lapis lazuli rock consists of disseminated hauyne, diopside and plagioclase in coarse grained marble, amongst which are blocks of purer rock up to 1 m across consisting of hauyne (4-42%), diopside (16-62%), nepheline (up to 20%), plagioclase (An10-25) and phlogopite, with occasional scapolite, tremolite, sphene, apatite, pyrite and pyrrhotine (Hogarth, 1971). A general, and illustrated, account is given by Grice and Gault (1983) who give a numnber of mineral analyses.

Economic: 
Used by local Eskimos for manufacture of handicrafts.
References: 
GRICE, J.D. and GAULT, R.A. 1983. Lapis lazuli from Lake Harbour, Baffin Island, Canada. Rocks and Minerals, 58: 12-19. HOGARTH, D.D. 1971. Lapis lazuli near Lake Harbour, southern Baffin Island, Canada. Canadian Journal of Earth Sciences, 8: 1210-17
Fig. 25 Main lapis Lazuli occurrence at Lake Harbour (after Hogarth, 1971, Fig. 2).
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith