EARTHS, argillaceous. 3i.ArglIla. 
Its 
1. In a powder)’ form. 
Marga porccllana. Wall. min. 23. 
Argilla porcellana. l^tgel miner. 33. 
3. Mixed with micaceous particles, 
Argilla Dorcellana. nat. xii. 3. p. zoo. n. 3. _ 
Found in Confuiall, Japan^ China, Saxony, and various parts of 
Europe, and is iuppofed to originate from decompofed felfpar: 
colour white, greyiflt, reddillt or ycllowiih-white : adheres 
very flightly to the tongue, and feels foft|but not grcafy : 
does not change its colour when expofed to heat, but becomes 
white, and tranfparcnt in proportion to the quantity of filica 
it contains: it is principally ufcd in the manufaiflure of 
china ware: contains' alumina 60, lilica 20. air arid wa- 
ter I 2. 
Vefy foft arid greafy to the touch, adhering to the tonguej 
Ihining when rubbed, becoming firft blackilh and paler 
when burnt, apyrous. 
Argilla apyra. Syfl. nat. xii. 3. p. zoo.n. 2. 
Argilla apyra. Wall.Jyst: min. 1. p. 53 " »• 
Potiers clay. Kirnuan mineral. 1. p. 187. 
Pipeclay. Sehmeiffer mineral l.p. 156: 
Common clay. Thontfon cheni. 3. 53?. 
Found in Normandyt near Cohgn, Livonia^ and other parts of the 
world : colour varying from pufe white to black, and is often 
Variegated : when flrll expofed to heat, it becomes blackilh, 
from the inflammable matter it often contains, but by Conti- 
nued heat it turns pure white: it is ufed far tobacco-pipes 
and various vefl'eb. 
Friable, very greafy to the touch, fhining, fcaly. 
Talcum (ubfriabile. SyU. nat. iii, 3. 51. n. i. 
Lithomarga, Kir<Wan miner, t. p, 187. 
Lithomarge. SchmeilJer miner, i.^. 160, 
Potters’ clay. Tloom/on chem. 3. p. 535. 
2. Somewhat friable, greeh, making a mark. 
Talcum viridans. Spft. nat. xii. 3. /. 51. ». i. 
3. Hard, receiving a polifli. 
Terra miraculola. Sebuz. Nov, Adi. Ac. Caf, Nat. Cur. 3. dpp. 
Indurated Lithomarge. Schmeijjer mineral, i. p. 160. 
4. F.mitting phofphorefcent fpafks in the dark, when rubbed with 
the point of a pen, 
N. Trehra Chem. Ann. 1784. \. p. Kirovan l.p. 19O. 
Brachmahn Chem. Ann. 17 ^ 5 * P- 449 * 
Indurated Lithoxriafgc. Scbmeifier min. l. p. 160. 
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