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File:Thin section scan crossed polarizers Siilinjärvi R625-153.25.jpg

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Photomicrographs from the same thin section.
English: Scanned image of thin section from Siilinjärvi apatite ore in cross polarised transmitted light. The thin section is thinner in the right hand side, and that is the reason for different interference colours there.

The thin section consists of apatite grains in mica groundmass. The thin section is highly sheared and mica flakes have grounded into elongated pieces. Carbonates are only featured as an accessory mineral.

Tetraferriphlogopite forms 85 % of the thin section area and it is mostly present as small elongated laths. The laths are uniformly oriented, although they circle around the apatite clasts. Some bigger flakes have survived, commonly in the shade of large apatite grains. Groundmass-sized fragments constitute about 75 % of the micas. The laths are shattered, and grain size varies with the shearing intensity. The grains are mostly < 1 mm long and 0.2 mm wide, and the average grain is about 0.3 mm long and < 0.1 mm wide.

Apatite is present as fragments and rounded grains, and covers 15 % of the thin section. Some very minor amounts of carbonates are found near or inside the apatite grains. The diameter of the apatite grains is 0.5-2.5 mm, the fragments are smaller.
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current14:58, 13 November 2019Thumbnail for version as of 14:58, 13 November 20193,880 × 2,300 (3.05 MB)Kallerna (talk | contribs)User created page with UploadWizard

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