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albite Alumina amphicheiral analysis appearance augite barium beds beknottedness blockage bromacetic acid Caithness carbon cent centimetre circuit cleavage angle colour conglomerate Corry crossings crystalline crystals curve Deflection determined detritus diagram Diff dimethyl-thetine diorite direction discs dynamic frame element equation feet felspar Ferric Oxide Ferrous flagstones force friction circles gives Glen Spean gneiss grammes yielded granite granular heat hills hornblende hydrobromate imbedded Insoluble silica intersections joint knot labradorite lake Lime limestone Loch Treig lustre machine Magnesia malacolite Manganous Oxide mass mineral observed obtained occur Old Red Sandstone oligoclase Orkney orthoclase parallel plane Plate platinum portion Portsoy position possible impurity Potash quantity quartz resisting link rock roots salt scheme Scotland seen serpentine shales shown side silica Soda solution specific gravity specimens strata structure substance sulphide of methyl surface temperature thetine thick thiodiglycollic upper values vector vein wire