Abstract

Vein fillings in the King's Mountain pegmatite yield good eucryptite crystals with a=13.490, c = 9.016±0.007 Å, a:c= 1:0.6684 (X-ray), 1:0.6685 (morph.). Bikitaite had a = 8.614, b = 4.957, c 7.603 ± 0.022 Å, β=114° 19.3′ (X-ray). Chemical analyses yielded the formulas (Li5.80Na0.06)Al5.98-Si6.05O24 for eucryptite and Li2.10Al2.00Si3.97O12·1.95H2O for bikitaite.

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