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Adelaide alluvials Amalgamated Wireless A/asia Aust Australian quartz crystal Brazilian bubbles Bull Commonwealth of Australia composite structure courtesy of H.M. cracks Croydon crystal face crystal useless crystal very large crystals are illustrated deep twinning deposits detected dump electrical Figure flaws foreign matter Garretty Geol ghost or phantom Glycerine grams growth-lines H.M. Postmaster-General Hightmans Homestead illustrated on Plates irregular King's Bluff Kingsgate field Mannahili Methyl salicylate miles south-east milky Mineral Resources N.S.W. Mount Lofty Quarries NATIONAL DEVELOPMENT Northern Territory Optical twinning Payne's Find pegmatites PIEZO-ELECTRIC QUARTZ pipes Prism faces quantities of usable quartz crystal occurs quartz crystal worth radio reefs render a crystal rock crystal shaft showing excessive twinning South Wales specimens strong light Surv tartrate tourmaline twinned crystal showing twinning line twinning render Twinning.—This unless crystal Unsuitable usable quartz crystal Varieties of twinning W. H. Spooner Wavy striations Western Australia Wolfram Camp Field Yalgoo zircon