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acids aggregated alfo alkalis Alumine AMORPHOUS analyfis Antimony argillite arsenic black colour blow-pipe bluish Bohemia borax brittle Carbonate cobalt compact compofed conchoidal copper Cornwall cryftallifed crystallised crystallised quartz crystals cubes dark brown colour dull white colour effervescence expofure fame felspar ferruginous fire with steel fluor fmall foliated fpar fracture Freyberg galena GENUS Germ give fire green greenish grey colour greyish Hartz heat hexhedral prisms hexhedral pyramids Hornblende Hungary imbedded incrustation indurated clay intermixed with white interspersed irregular Kirwan Klaprotb laminated Lime luftre lustre mass matrix melts metallic mica minutely crystallised moft muriatic native nitric nitric acid nodule ochry octohedrons Oxyde of Iron pale PARTICULAR SHAPES polished ponderous spar prifms prismatic reddish brown rhomboidal Sameplace Saxony semitransparent Siberia Silex silver SPECIES III SPECIES IV specific gravity stalactites striated sulphur surface tetrahedral thofe transparent truncated VARIETY VARIETY Wedgw white quartz whitish yellow colour yellow pyrites yellowish zeolite
Page ix - ... to acquire a comprehenfive knowledge of mineralogy, but who had neither leifure nor inclination, even if they had an opportunity, to confult the numerous works through which the neceflary information lay fcattered.
Page ix - He had been employed, as then mentioned, in forming from the extenfive and valuable collection of the late Earl of Bute, a more compendious and feleft cabinet, now in the pofleffion of Sir John St. Aubyn, Bart, and as this required not only ä considerable length of time, but alfo a degree of attention much beyond what was at firft conceived neceflary for fuch an undertaking, the author thought, that in making...
Page 147 - This, like gold, is never found free from alloy, being always combined with a certain proportion of copper, and fometimes with a f ¡nail quantity of gold, iron, or regulus of antimony.
Page 147 - The figure of its cryitals is either cftohedral or cubical, generally the former. It differs little from pure filver in its weight, texture, hardnefs, duftility, fufibility, &c.
Page 271 - Hatchet is juftly ofopinion, that the progreffive changes of naptha into petroleum, mineral tar, mineral pitch, and afphaltum, are caufed by the gradual diffipation of part of the hydrogen of¿the bitumen and the confequent difengagement of carbon.
Page ix - SPECIES, as ftunded on chemical, and the varieties on external charaEters, he has nearly adopted the arrangement of Baron Born, in his catalogue of the colleaion of MademojfElle Eléonore de R.aab; that R.