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XPL
PHOTOMICROGRAPHS: TERRESTRIAL
These photos were taken through an Olympus
CH-2 modified for
cross-polarising work. I'm quite new to this, so my
identification of minerals should be taken with a pinch of salt :-) The
wider thumbnails lead to a side-by-side image of the specimen in plane
polarised and cross-polarised light. Some of the images are a little
burnt-out, I need to experiment further with camera settings (and
cameras) to nail this.
Some of the full-size images are pretty big.
| OLIVINE TESCHENITE: Ayrshire,
Scotland (TS001). This slide contains
plenty olivine, brightly coloured and with random cracks, alongside the
straight, black-and-white plagioclase crystals. |
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ANDESITE:
Montserrat, West Indies (TS005). Collected
from a lahar
of the Soufriere volcano, this is rich in hornblende with inclusions
and various feldspars. The second photo has a remarkably 3D effect - it
looks a bit like a space station. Numbers 4 and 6 show really good
zoning (changes from the core to the rim of the crystal). |
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ANDESITE: Montserrat, West Indies (TS007). Collected from a lahar of the
Soufriere volcano, this is rich in hornblende with inclusions and
various feldspars. |
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FLUXION GABBRO: Ardnamurchan, Scotland (TS006). Rich in pyroxenes,
plagioclase, biotite and magnetite (the black areas). I love the last
shot - it looks to me like a young girl looking at the stars. |
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QUARTZ SCHORL: Roche, Cornwall (TS008). This rock
consists mainly of tourmanline crystals in quartz. The tourmaline is
highly coloured in XPL. |
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