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Published online by Cambridge University Press: 14 March 2018
The results are presented of some recent feldspar studies that relate the fundamental concepts of order-disorder series to petrological problems. New diagrams have been prepared with coordinates ‘optical properties-chemical composition-structural state’. From direct observations made on natural minerals some conclusions have been reached about the sequence in which the solid-state transformations of ordering, unmixing, and twinning occur in feldspars.
A study has been made of the geological distribution of different structural types of alkali feldspars in single intrusive bodies (Tertiary granite, Palaeozoic syenite, Pre-cambrian charnockite), in magmatic complexes, and in different complexes of the Ukrainian Shield and the Caucasus Geosynclinal Province.
page 298 note 1 See references in papers of the Feldspar-Symposium in Cursillos y eonferencias, Instituto ‘Lucas Mallada', 1961, Fasc., Madrid
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page 299 note 7 In labradorites it is only possible to observe one optic axis by inclining the universal stage when the trace of the (010) cleavage is visible and the twins are not superposed.
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page 302 note 1 The common axis of the individual indicatrices may, of course, beα,β,or γ;ά,β́,γ ́,,α ́,and a’all lie in the plane normal to this common axis.
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