204 
EARTHS. AGGREGATE. 64. Arciiarius. 
Found in Britain and various parts of Europe, of a rufous, ycj' 
lowifl], white, or grey colour; fonietimes mixed with paf'*' 
cles of mica, or containing veftiges of Ihells; -it is chicA/ 
ufed for grindftones, ‘fcythe-llones, and buildings, and is fup' 
pofed to produce confumption in thofe who inhale its fiu® 
dully particles. 
coagmenta- Porous, not filtering water, confilling of rather larg^f 
tranfparent grains. 
Cos co.agmentata. Spt. nat. xii. 3. p. 63, n. 9. 
Siliceous fandltone. Sovjerky Brit. min. t. 49, 50. 
Found in various parts of Europe, and is more or lefs porouS» 
with rigid tranfparent grains. 
Lightifh, irregularly pitted, filtering w'ater, confifting 0^ 
fmaller grains. 
Cos partic. arenof. Wall. Pyst. i. p. 198. n. 9. 
Found in Mgermannia, where it is ufed for buildings. 
Hard, filtering water, confilling of larger equal grains- 
Filtering-Jioni'. 
Cos partic. srenac. &yst. nat. xii, 3. p. 63. n. 10. 
Cosaquam tranfmittcns, Wall.fyst. 1. p. 197. n.%. 
Found in the Canaries, on the Ihores of Heno Spain, in Saxon) 
and Bohemia, gen. rally grey with pellucid angular grains- 
Its chief ufe is to render fait waters fwcet, or turbid ones 
clear, 
fundamen. Hardifh, confilling of unequal, angular, opake, larged 
tails, grains. 
Cos, partic. angulof. Syd. nat. xii. 3. p. 64, n. 16. 
Cos. partic. arenof. Wall, fyll, i.p. 195. n, 6. 
Found in Britain, particularly in Densonjhire and Che/hire, i'l 
S‘weden and other parts ; rigid to the touch, diiEcult to be 
cut into pieces, falling into fand in a imall degree of heat • 
colour white, grey, greenilh, brown, red, or yellowifli : h 
is rather folid, and when cut horizontally is ufed for the 
foundation of buiidings.- 
foraminu- 
lentus. 
Fill rum. 
B. With a calcareous cement. 
(rystallinus. Hard, grey, in aegregate rhombic cryllals united by 
cement of fpar. 
Lajfone A8, Par, 1777. p, 43. 
liaca. fehr, hirl, naturf, 2. p. 1 42. 
Freber bemerk. in neuf. het. (jc. />. 5 1 . 
found in feveral parts of France, and contains about 5 parts 
fand to 3 of fpar. 
