72 EARTHS. PONDEROUS. 6. Barytes. 



Found in the lead mines of Stafford and Dtrhy^ near Freyhurgy 

 and in the vicinity of Pans, in coarfe durty particles, moftly 

 forming fmall concretions, feldom in the form of powder : 

 has an arid appearance, feels coarfe, rough and har{h, and 

 foils the fingers a little ; colour fnow-white, greyilli, reddifh 

 or yellowini-white : it fometimes contains a little gypfum, 

 fiiica, and lime, 



ainpaSia^ Subopake, lliining, of a fplintery fra6lure, with the frag- 

 ments indeterminate and acutan^led. 



Compdft Barofelenite. Kiavjau. t?uneral. i,/>. 138. 



Compa<^"l heavy Spar. Sch.'neijfer mineral, i. /*. 256, 



Compa6^ fulph'^t oF Barvtes, 1 horn fan's chem. 3. p 622. 



Found in the lead nimes o'i Derby fkire and Stafford/hire, and in 

 Saxony, in amorphous or h^^lf rounded mafies, or in nodules i 

 breaking into fliarp angular pieces, and when broken it has a 

 dull appearance, uith fometimes a little glittering ; colour 

 dull grey, ycllowifh-white or yellowifh, cream-colour, pale 

 flefli-colour, reddilh, or bluifh: contains fulphat of baryt 

 83,5, filica 6,7. felinitc 2, water 2. fpecinc gravity from 

 4,3. to 4,4, 



hcnoniensis. Diaphanous, fliining, fomewhat fibrous, breaking into 

 fragments more or lefs rhombic. 

 Muria phofphorea. Syf}, nat, xii. 3. p. 99. n. 6, 

 Gypfum fpathofam. Wall. fyji. inin. i,p.i6z, 

 Bononicn ftone, Schme'/Jjer mineral. \, p. 261, 

 Bologna Itone, Thomfon s chemifiry, 3. p. 623. 

 Found on the mountain Paterno near Bologna, detached, in 

 roundifh flat kidney-form pieces, the fragments of which arc 

 obtufangied, roundifli, with the fuperficies unequal : broken 

 in a certain dire(^lion it appears fibrou?, broken in another it 

 appears rather lamellous : fometimes Talis to pieces fpontane- 

 oully into granular fragments : colour fmokc-grey, with a 

 fmall degree of femitranfparency : fpecific gravity from 

 4,440. to 4,496. contains by analyfis fulphate of baryt 62,0. 

 filica 16,0. alumina 14,75. gypfum 6,0. iron 0,25. water 

 2,0. 



lamellata. Shining witnin, lamellar in a frondofe manner, fponta- 

 neoLifly falling into fcaly fragments ; the thicker 

 fcales cutting the plates under a right angle. 



Lamellated heavy Spar. SchmeiJJer mineral, i. p. 256. 



Found m the mines oi Saxony zwd T^mnfylvaniay in foiid mafies, 

 loimetimes in fmall lenticular cry Hals, fometimes cluftered 

 together in an oval kidney or fpheroid form : colour white 

 or cinereous, pale yellowilh, browhifh-rcd. 



*imlgaris. Lamellar, breaking into rhomboid fragments, falling fpon- 

 taneouily iiito convergent fcales. 



