Siilinjärvi carbonatite
The Siilinjärvi carbonatite complex is in Central Finland near to Kuopio. It is named after the village it is next to, Siilinjärvi. It is a carbonatite mine. The complex is about 16 kilometres (9.9 mi) long. The place was discovered in 1950 by the Geological Survey of Finland. They began mining it in 1958. It is the second-largest carbonatite complex in Finland. The Sokli mine is the biggest.[1][2]
Siilinjärvi Carbonatite Media
Fertilizer factories near to the mine.
Thin section of apatite-rich carbonatite in cross polarised transmitted light.
Thin section of apatite-rich glimmerite in cross polarised transmitted light.
Saarinen satellite pit in Siilinjärvi apatite mine.
Glimmerite. Scanned image of thin section from Siilinjärvi apatite ore in cross polarised transmitted light.
A drill core sample from Siilinjärvi.
Tetraferriphlogopite grains. Photomicrograph from thin section in cross and plane polarised light.
Carbonate vein. Photomicrograph from thin section in cross and plane polarised light.
Fluorapatite grains in carbonate groundmass. The sample is taken from non-sheared ore, and apatite grains are large, rounded and elongated. Photomicrograph from thin section in cross and plane polarised light.
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