Abstract
DURING the investigation of the physical and optical properties of natural members of the potassium–barium feldspar series, research on the binary system was undertaken to supplement data available from the rare natural materials. To this end, charges for end-members were prepared using K2CO3, BaCO3, pure aluminium powder (kindly supplied by the British Aluminium Co.) and ethylorthosilicate; details of the method of preparation will be published elsewhere.
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