72 
tempos a. 
henomtnsis. 
lamellata. 
•oulgaris. 
EARTHS. PONDEROUS. 6. Barytes. 
Found in the lead mines of Stafford and Dtrhy, near Freyhurg, 
and in the vicinity of Paris, in coarfe dully particles, moftly 
forming fmall concretions, feldom in the form of powder : 
has an arid appearance, feels coarfe, rough and harfh, and 
foils the fingers a little ; colour fnow white, gteyifh, reddifh 
or yellowifh-white: it foinetimes contains a little gypfum> 
fiiica, and lime. 
Subopake, (liiningj of a fplintery fradure, with the frag- 
ments indeterminate and acntangled. 
Compafl Barofelenite. Kio-wau mineral i.p. 138. 
Compaft heavy Spar. Schmeijjer mineral, i. p. 256. 
Compafl fulphnof Barjtcs. Ihomfen's chem. a, p 6 zz. 
Found in tlie lead mines of Derhyjkire and Staffordfiire, and in 
Saxony, in amorphous or h.lf rounded mafl'es, or in nodules} 
breaking into (harp argular pieces, and when broken it has a 
dull appearance, with fometimes a little glittering » colour 
dull grey, yellowifh-white or yellowifh, cream-colour, pale 
flefh-colour, reddifli, or bluilh: contains fulphat of baryt 
83.5. filica 6,7. felinite 2. water 2. fpecific gravity from 
4,3. to 4,4. 
Diaphanous, Ihining, fomewhat fibrous, breaking into 
fragments more or lefs rhombic. 
Muria phofphorea. Sy^l. not. xii. 3. p. 99. n. 6. 
Gypfum fpathofum. PV.1II JyJi. mtn. x.p.ibz, 
Bononicn ftone, SchmeiJJermineral. i. 261. , 
Bologna Hone, Thomfons chemiHiy, 3. />. 623. 
Found on the mountain Paterno near Bologna, detached, in 
roundifh flat kidney. form pieces, the fragments of which are 
obtufangled, roundifh, with the fupetficies unequal ; broken 
in a certain direftion it appears fiorous, broken in another it 
appears rather lamellous : fometimes lalls to pieces fpontane- 
oufly into granular fragments : colour fmoke-grey, with a 
fmall degree of femitranfparency ; fpecific gravity from 
4,440. to 4,496. contains by analylis fulphate of baryt 62,0. 
filica 16,0. alumina 14,75. gypfum 6,0. iron 0,25. water 
2,0. 
Shining witnin, lamellar in a frondofe manner, fponta- 
neoufly falling into fcaly fragments ; the thicker 
fcales cutting the plates under a right angle. 
Lamellated heavy Spar. Schmeijjer mineral. 1 . / 256. 
Found in the mines of Saxony and Traniylvania, in folid mafl'es, 
foinetimes in fmall lenticular cryiUls, fon'etimes cluilcred 
together in an oval kidney or fpheroid forui : colour white 
or cinereous, pale yellowifh, browhifh-red. 
Lamellar, breaking into rhomboid fragments, falling fpon- 
taneoully into convergent fcales. 
