MINERALOGY. 
£7 
1. Of no vifible particles, particuUs impaU 
pahilihus^ in French Grignard. 
A. Of an irregular figure. 
a. Yellow, from the plafter-pits at Mont* 
martre near Paris. 
1. White, from Italy. 
This is ufed in feveral works, as ala- 
batter, efpecially when it is found in large 
pieces; and then it commonly varies in 
colour between white and yellow, as alfo 
in tranfparency and opacity. 
2 . Of a fpar-like texture, Texturafpatofa. 
A, In form of a cone. 
a. White and yellow, from Trapano in 
Sicily. 
B, Of an irregular figure. 
a. White, from Stollberget in Koppar* 
berg Sian in Sweden 
SECT. XXL 
C. Calcareous Earth fatiated with the acid of 
common fait, "Terra calcarea addo falls com^- 
^ What has been before obferved (Seft. xi. xli.) about 
accreted fpars and finter, may alfo be applied to' this fpe- 
cies f . 
f Gypfeous foffils abound in Englancf. Plafter ftone, granulated and 
folid, fome fo very fine as to be alabafterj that is, take a furface and 
polituie, are plenty in Derbyfliire and Nottinghamlbire^ where are 
large pits of ir, and alfo in molt of the cliffs of the SeveVjiL,^ efpecial- 
ly at the Old PafTage in Somerfetfhire. A very fine femipeliucid folid 
alabafter is found in Derbyfiiiie. Fibrous talcs, very fine, are found m 
the fame pits of plafier-ftone above- mentioned, and many other places, 
Seleriites of many kinds abound in England in clays, infbmuch that it 
is needJefs to enumerate the places. Very fine gypfeous Diufen are found 
in Sheppy-ifle, and the mofi: beautiful I have ever feen, perfectly pellu- 
'cid as criftai and large, has been dug from the fait -rocks at Nantwich in 
Chelhire. The Selenites Rhomboidalis, a rare fcCil in other countries, 
is frequently found in England ; but Shotover-hill in Oxfordfhire, is fa- 
mous for them. I do not know of many of the fpar-like gypf^a of Eng- 
lifh produd, but the Ifle of Shsppy affords a kind (to my knowledge pe- 
culiar 
