Tourmaline In Thin Section
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Tourmaline in thin section.
Tourmaline in thin section. Tourmaline in tourmaline schist plane polars. Tourmaline formed in multiple complex stages and is commonly intermediate schorl dravite with a general progression in later tourmaline generations towards more fe rich and al deficient. Pink tourmaline in lepidolite.
Some edges and terminations visible. Tourmaline forms triangular prismatic crystals and can show a range of body colours. Tourmaline na ca mg fe 2 fe 3 ti 4 cr al li 3 al 6 bo 3 3 si 6 o 18 oh 4 the name tourmali was a generic name used in ceylon sri lanka for colored gems mostly zircons.
Width of field of view. It shows the faintest ppl colours when the. Tourmaline thin section photomicrographs are taken in plane polarized light and cross polarized light and can easily be recognized under the microscope.
Tourmaline thin section view description. Tourmaline in a granite pegmatite from portsoy aberdeenshire. About 1703 it had been discovered by dutch lapidaries that some of the zircons arriving in the netherlands were actually a previously undescribed mineral.
Small 250x250 max medium 500x500 max. Tourmaline in hand sample. Body colour in thin section is commonly blues or brown sometimes green or colourless.
It also exhibits intense pleochroism. Tourmaline in tourmaline schist crossed polars. This video helps the viewer to identify tourmaline under a petrographic microscope.
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