£ARTHS. SILICEOUS. 42. Gemma. 145 



Euclasius, Hard, pellucid, lamellar, green, in 4-rided oblique prifms 

 whofc ed^es are variouliy truncate and whofe faces are 



oblique. 



Euclafius. La Metherie Journ. Phyf. 1 792. /iug, ^.155. 



Euclafe. Tho>n/on chem. 3. ^- 55^- 



Found in Peru: is very brittle and fufficiently hard to fcratch 

 quartz : texture foliated : frafture conchoidal : caufes dou- 

 ble refr::fbion : is fufible by the blowpipe into a white cna* 

 mel: fpeciftc gravity 3,0625. contains filica 36. alumina 23, 

 glucina 15. oxyde of iron 5. yauquelin, 



^corlites, Hardifh, fomevi^hat ponderous, diaphanous, of a greenifh 

 or yellowifh -white colour which is not altered by the 

 fire, not fufible per fe. 



Schoerlit. Klaproth chem. annaL 1784. 2.^,391. 



Shorlite. Klrxv an miner. i,p. 286. 



Shorlite. 1 hom/on chem. '^. p' ^zS^ 



Found in 5r«/// and Saxony, with mica or quartz, generally in 

 oblong mafTes, which when regular are 6-fided prifms: 

 fradure uneven, and feemingly fomewhat foliated : ipccific 

 gravity 3,530. contains alamina 50. filica 50. Klaproth, 



Sgrylltts, Hard, of a blue-green colour, not altering its colour or 

 fufible by heat, of a conchaceous texture which is 

 foliated when broken tranfverfely, in 6-lided prifms 

 which are ufually longitudinally ifriate. 



Beryllus. Cronst. mini, 42. 2, 



Beryll. Kirixj an miner, i* /. 248. 



Beryll. Scbme'JJer 1 . />. 65. Thorn fon chem, 3. />. 5574 ^ 



Found in the mountains of Saxony^ Siberia^ &c. in Quart'2, 

 Granite* Wolfram, and other matrices : its cryftals are of 

 various magnitude, fometimes diaphanous fometimes pellu- 

 cid, rarely folitary or in pairs, generally aggregate or ffci- 

 c!ed : colour approaching to green or blue, rarely to yellow: 

 fpecific graxity from 2,250, to 2,782. contains a very fmall 

 proportion of alumina, lime, and iron. 



GhryfoberyU Hard, pellucid, green, highly (hining internally, of a 

 ^*-^- conchaceous texture. 



Chryfolithus. Wail. fy^t. min. \. p. 244. «. 6, c* 



Chryfoberyll. Kir^van mineral, i. /. 261. 



Chryioberyl. 1 homfon chem. 3. p. 510. 



Found in BraCtUvA Ceylon^ in round rnafles about the fi/.e of a 

 pea, or crvilallized} the form of its cryftals being a ^-fided 

 redangular pnfm, the moll common variety of which is an 

 8-/ided prifm terrainared by 6-fided iummits: colour yel- 

 lovvilh-gaecn, with a Iparkling furface : texture toli-.ted, 

 with the foliations parallel to the faces of the prifm ; caufes 



VOL. V[[. — T 



