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INTRODUCTION. xxxix But fuch a pi&ure or defcription is to be drawn up from the examination, not of one or a few. but from many fpecimens, hence the neceflity of having an ex- tenfive mineral fuite, before we pretend to know the pecies already in the fyllem, or to defcribe new ones. ^ 12. The only fources from which the denomina- Sources tions of minerals ought to be taken, are the follow-whence l the names j-. of minerals ' romfome cha acteristic external character. Thus[ h P uldbe the mineral which chemifts term fulphat of flrontian is, on account of its charaderiftic blue colour, deno- . Inate< ^ by Werner Celeftine. Aftynolite derives its name from its radiated fradure j Schalftone, from its lamellar diftind concretions. markii \ Vl re / em ^ ance to oihe> bodies. '] hus that re- - r r foun " in Iluw bv j 3 pmes of zeolite, was, by Wcmer. de„„m,„ a ,, d on ^ J to pearl" 8 nce ,n colour > fha pe, and ftrudure ufe in ih H ^ 3C ‘ r c l ^ e ' P roce ^ a * n earth from its V V manufadure of procdain. ftone dlrivefitf ^ ^ ^ fomd ThUS L y dian was fir ft fo und " Ljrdk ’ m ACl *> where k neral ^ dfcoverer. Thus the mi- i ' n i . nU ' latP ^ hy chemifts carbonate of barytes, difcove ^f ner Withcrite, in honour of its firft dilcoverer, Dr Withering. We
