At higher temperatures kyanite inverts to sillimianite, over a wide range of pressures and high temperatures. Andalusite, kyanite, and sillimanite are an example of polymorphism because the conditions under which they were formed give rise to their structures.

Kyanite thin section photomicrographs are taken in plane-polarized light and cross-polarized light, and can easily be recognized under the microscope.

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Kyanite is a typically blue aluminosilicate mineral, found in aluminium -rich metamorphic pegmatites and sedimentary rock. It is the high pressure polymorph of andalusite and sillimanite, and the presence of kyanite in metamorphic rocks generally indicates metamorphism deep in …

Thin section scan of 2162-27 in PPL displaying quartz (colourless), biotite (brown pleochroic), kyanite (grey) and plagioclase (colourless). Other minerals present such as rutile are too small to be seen here but can be found in the close-up mineral videos below.

Mar 17, 2021 · I looked into how to determine garnet, andalusite, kyanite, sillimanite, staurolite, talc, chlorite, and corundum under cross polarized light (XPL) and plane polarized light (PPL).

Oct 1, 2014 · Here are some tips and tricks for making a good (if not perfect) thin section sketch. Rarely a thin section is drawn with both PPL (plane polarized light) and XPL (cross polarized light). Thin section sketches should be drawn in one type of polarization.

Photomicrograph of kyanite in plain and polarized light showing a twinned crystal displaying clear mirror-image cleavage and opposite interference colors. Click on the image to see a larger …

Reticite (Kyanite - Al2SiO5) Reticite or "raethicite" is variety of kyanite rich in graphite inclusions. The name come from "retic Alps" (Italy). Optical properties: • Form: Usually found as subhedral blade-like prisms • Color: Colourless or pale blue • Cleavage: (100) and (010) very good

Oct 4, 2024 · 🔮Kyanite is a new type of refractory material belonging to high-alumina minerals. It exhibits strong resistance to chemical corrosion, high thermal shock mechanical strength, and irreversible thermal expansion.