FERROAN WODGINITE FROM ANKOLE, SOUTH-WEST UGANDA

Well formed crystals of ferroan wodginite occur in the pegmatite called 'Nyanga 2' in Ankole, Uganda. The crystals invariably represent penetration twins. The unit cell parameters are: ao = 9.48 A, bo = 11.42A, c — 5.12 A, s — 90°30'. Space group: C2/c ( Cc ). The separation of the doublets 221—221 and 222—222 is less pronounced than in the manganoan varieties of wodginite described in literature. The wodginite crystals contain inclusions of tapiolite. Microprobe analyses of the wodginite and of the tapiolite inclusions are given.