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File:Thin section scan crossed polarizers Siilinjärvi R636-131.20.jpg

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A sample from which the thin section was made.
English: Scanned image of thin section from Siilinjärvi apatite ore in cross polarised transmitted light.

The thin section is very mica rich and lightly sheared. Shearing has shattered the mica flakes into pieces but there are spots without any broken pieces, only big mica grains.

Tetraferriphlogopite forms 82 area-% of the thin section. The flakes are usually 1-3 mm long and > 0.5 mm in width. Smaller elongated pieces form one quarter of the mica area, and they are found within the shear bands. The tetraferriphlogopites are moderately oriented.

Amphiboles are mostly found near the more sheared parts of the thin section and they form 10 % of the thin section area. Some grains are euhedral but mostly they are subhedral. Inclusions are widespread and the most common inclusion mineral is tetraferriphlogopite. The amphibole grains are 1-4 mm in diameter. The blue colour of the mineral is quite weak, but still prominent – the amphiboles are a mixture between richterite and tremolite.

Apatite grains are often broken, but the pieces are still close to each other. The grains are 1-3 mm in diameter, although broken pieces in the mica groundmass are smaller. Apatite and carbonates are usually in companion with each other. Apatite forms 5 area-% and carbonates 2 area-% of the thin section. The carbonate grains are smaller than apatite and usually less than 1 mm in diameter. Dolomite is the dominating carbonate mineral.
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current19:05, 12 November 2019Thumbnail for version as of 19:05, 12 November 20193,800 × 2,050 (2 MB)Kallerna (talk | contribs)User created page with UploadWizard

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