MINERALOGY. 27 



k Of no vifible particles, pdrticuUs impaU 

 pabilibus, in French Grignard. 



A. Of an irregular figure. 



a. Yellow, from the plafter-pits at Mont- 



martre near Paris. 

 I. White, from Italy. 

 This is ufed in feveral works, as ala- 

 bafter, efpecially when it is found in large 

 pieces ; and then it commonly varies in 

 colour between white and yellow, as alio 

 in tranfparency and opacity. 

 2. Of a fpar-like texture, Textura fpatofa* 

 A. In form of a cone. 

 a. White and yellow, from Trapano in 

 Sicilv. 



B. Of an irregular figure. 



a. White, from Stollberget in Koppar- 

 berg Slan in Sweden *. 



D 



SECT. XXL 



C. Calcareous Earth fatiated with the acid of 

 common fait, 'Terra c ale area aeido fails com- 



* What has been before obferved (Seel, xi. xli.) about 

 accreted fpars and finter, mdy alfo be applied to this fpe- 

 cies f . 



i Gvpfeous fc'fTils ahnund in England. PJafter ftone, granulated and 

 folid, (owe fo very fine as to be alabafter, that is, take a fuiface and 

 polltdre, are plenty in Derbyshire and Nofringhamfhire, where are 

 larjre pi's oi if, and alfo in moft of the cliffs of the Severn, efpecid* 

 ly at the Oid PafTage in Somerfetfnire. A very fine fenriipellucid folid 

 alabafter i> found in Derbyfhire. Fibrous talcs, very fine, are found in 

 the fame pits ot platter (tone above mentioned, and many other places. 

 Seleri'^s ol many kinds abound in England in clays, infomuch that'it 

 is nc to enumerate the places. Very fine gyplc.us D:ufen are found 



in Sbeppy-itfe, and the moft beautiful I have ever feen, perfectly pellu- 

 cid as criftal ^M large, has been dog irom the fait -rocks at Nantwi;h in 

 Chefhire. The Ssleni'es Rhomboid-iiis, a rare foffi I in other countries, 

 is frequently found in England ; but Shotover-hiil in Oxfordshire, is fa- 

 moLi for them. I do not know of many of the fpai -'ike gyufea of Eng- 

 lift product, but the I.le of Sheppy afford? a kind (to rny knowledge pe- 

 culiar 



