Fundamental Minerals

Sialic Minerals

Feldspars

Feldspathoids

Quartz

Femic Minerals

Spodumene

Accessory Minerals

Rare Accessory

Alteration Products

Microstructures

Rocks

Jacupiranga complex

Niocalite carbonatite

The carbonatite in the Oka complex are coarse-grained calcite-carbonatite (sövite) with accessory amounts of sodian augite, biotite, apatite, nepheline, monticellite, melilite, pyrochlore, perovskite, niocalite (Oka is the type locality), richterite, pyrite and pyrrhotite. Dolomite-bearing carbonatites (rauhaugites) occur mainly in the NW end of the complex. Locally the carbonatites become very micaceous (biotite or phlogopite) and qualify as glimmerite. The economically important rocks here are almost all carbonatites, particularly a pyrochlore-sovite in the northern ring.

Bibliography

• Gold, D.P. (1969): The diatreme breccia pipes and dykes and the related alnoite, kimberlite and carbonatite intrusions occurring in the Montreal and Oka areas, Quebec, Part II, The Oka carbonatite and alkaline complex ; In Geology of Monteregian Hills, Cuidebook, Gaol. Assoc. Canada-Min. Assoc. Canada field trips.
•Gold, D.P.; Eby, G.N.; Bell, K.; Vallée, M. (1986): Carbonatites, diatremes and ultra-alkaline rocks in the Oka area, Quebec. In Geological Association of Canada Guidebook; Geological Association of Canada: St. John’s, NL, Canada, 1986.
•Shafiqullah, M., Tupper, W.M., & Cole, T.J.S. (1970): K-Ar age of the carbonatite complex, Oka, Quebec. Canadian Mineralogist, 10, pp. 541-552. Eby, G.N. (1987): The Monteregian Hills and White Mountain alkaline igneous provinces, eastern North America. In Alkaline igneous rocks. Edited by J.G. Fitton and B.G.J. Upton.Geological Society Special Publication No. 30, pp. 433-447.

Apatite (colorless) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 1x (Field of view = 9mm)	Apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 1x (Field of view = 9mm)	Niocalite crystals (high birefringence), apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 1x (Field of view = 9mm)
Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 1x (Field of view = 9mm)	Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 1x (Field of view = 9mm)	Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 2x (Field of view = 7mm)
Niocalite crystals (high relief), apatite (colorless) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 1x (Field of view = 9mm)	Niocalite crystals (high birefringence), apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 1x (Field of view = 9mm)	Niocalite crystals (high relief), apatite (colorless) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 2x (Field of view = 7mm)
Niocalite crystals (high birefringence), apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 2x (Field of view = 7mm)	Niocalite crystals (high birefringence), apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 2x (Field of view = 7mm)	Niocalite crystals (high relief), apatite (colorless) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 2x (Field of view = 7mm)
Niocalite crystals (high birefringence), apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 2x (Field of view = 7mm)	Niocalite crystals (high relief), apatite (colorless) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 2x (Field of view = 7mm)	Niocalite crystals (high birefringence), apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 2x (Field of view = 7mm)
Niocalite crystals (high relief) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 10x (Field of view = 2mm)	Niocalite crystals (high birefringence) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)	Niocalite crystals (high relief) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 10x (Field of view = 2mm)
Niocalite crystals (high birefringence) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)	Niocalite crystals (high birefringence), apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)	Niocalite crystals (high birefringence), apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)
Niocalite crystals (high relief) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 10x (Field of view = 2mm)	Niocalite crystals (high birefringence), apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)	Niocalite crystals (high birefringence), apatite (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)
Niocalite crystals (high relief) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. PPL image, 10x (Field of view = 2mm)	Niocalite crystals (high birefringence) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)	Niocalite crystals (high birefringence) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)
Apatite crystals (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)	Apatite crystals (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)	Apatite crystals (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)
Niocalite crystals (high birefringence) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)	Niocalite crystals (high birefringence) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)	Apatite crystals (I order gray) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)
Niocalite crystals (high birefringence) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)	Niocalite crystals (high birefringence) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)	Niocalite crystals (high birefringence) and calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 10x (Field of view = 2mm)
Twinning Planes in Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)	Twinning Planes in Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)	Twinning Planes in Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)
Twinning Planes in Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)	Twinning Planes in Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)	Twinning Planes in Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)
Twinning Planes in Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)	Twinning Planes in Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)	Twinning Planes in Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)
Twinning Planes in Calcite in a plutonic carbonatite (sovite) from Oka complex, Quebec, Canada. XPL image, 20x (Field of view = 1mm)