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File:Thin section scan crossed polarizers Siilinjärvi R625-110.80.jpg

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A sample from which the thin section was made.
English: Scanned image of thin section R625 110.80-110.95 in cross polarised transmitted light, Siilinjärvi apatite ore.

The thin section is carbonate rich and consists mainly of granular carbonate aggregate with some mica and apatite porphyroclasts.

Carbonates cover 75 % of the thin section and form the groundmass of the thin section. Calcite is the dominating carbonate mineral in the thin section, and dolomite grains are often smaller than the calcite grains. The texture is polygonal and the grains in the carbonate aggregates are on average 0.5 mm in diameter. The largest grains are just over 1 mm wide and smallest are < 0.1 mm. In general, the carbonates are well-preserved and non-altered, but some veins have metamorphic aureoles. There is also a spot where carbonates and micas have been pulverised to fine mass.

Common phlogopite forms 13 area-% of the thin section and is present as a couple of broken porphyroclasts and fragments. The biggest grain is 7 mm in diameter, but fragments can be < 0.1 mm in diameter. The average flake is about 1 mm wide and rounded. The fragments are often lath-shaped. The laths and other elongated grains are oriented in the same direction.

Apatite is present as large porphyroclasts in the carbonate groundmass. The rounded grains are 1-8 mm in diameter and have inclusion trails of carbonates. Apatite forms 12 % of the thin section area.
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current19:05, 12 November 2019Thumbnail for version as of 19:05, 12 November 20194,000 × 2,350 (2.33 MB)Kallerna (talk | contribs)User created page with UploadWizard

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