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(Bottom right) Aventurine feldspar showing schiller produced by flakes of
hematite, from Bjordammen, Norway. Play of colours Plagioclase solid solution
series. M-type twinning to indicate the origin in a monoclinic crystal; this type of
Some feldspars in the labradorite composition range show a play of colours that
varies through red, gold brown, yellow, blue, and green. Although there is some
overlap, the colours are related to the bulk composition of the sample: blue may ...
2^ leucite + liquid / / 1,150 + 20° C; z 1,118 + 3°C feldspar + liquid / 2* N / -z”
1,063°C --~~~ 1 feldspar 876°C 400 200 NaAlSiO, feldspar + liquid + gas
feldspar + liquid + gas 1 feldspar + gas 2 feldspars | l l Al | l l o 10 20 30 40 50 60
70 80 90 ...
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