The Särkijärvi main pit seen from the south in April 2016
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.
Images for kids
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Fertilizer factories near to the mine.
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Thin section of apatite-rich carbonatite in cross polarised transmitted light.
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Thin section of apatite-rich glimmerite in cross polarised transmitted light.
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Glimmerite. Scanned image of thin section from Siilinjärvi apatite ore in cross polarised transmitted light.
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A drill core sample from Siilinjärvi.
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Tetraferriphlogopite grains. Photomicrograph from thin section in cross and plane polarised light.
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Carbonate vein. Photomicrograph from thin section in cross and plane polarised light.
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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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Almost euhedral amphibole crystal in carbonate groundmass. Photomicrograph from thin section in cross and plane polarised light.
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Rutile grains as accessory post-kinematic mineral in highly deformed mica-rich zone. Photomicrograph from thin section in cross and plane polarised light.
See also
In Spanish: Complejo Siilinjärvi de carbonatita para niños