Sharred Properties:
Colour in PPL: colourless
Pleochroism: none
Relief: low
Feldspars may be distinguished between each other by a number of properties, but the
one most likely to be effective in pottery thin-sections is the twinning:
A feldspar with lamellar twinning is Plagioclase
A feldspar with tartan twinning is Microcline
A feldspar with no twinning is Orthoclase
This is not, of course, strictly accurate, but as long as you state that any untwinned feldspar is said
to be orthoclase then any reader will know what you are doing.
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Feldspars are the second most commonly occuring mineral next to quartz
Minerals in the Feldspar group are:
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