256 Geology and Mineralogy of Sulisbury. 
and laminated ; crystals obtusely rhombic—somewhat,le 
= Limestone. See Geological Remarks. 
asta Saleh occurs in a stalactical form, under 
iimestone ro 
<Cileamaa Tafa. At the falls of the Hooestennuc, the 
bank.for some distance below appears to be principally 
composed of calcareous ‘l'ufa. The rocks above and adja- 
cent are lime, which accounts sufficiently for its formation. 
- The surface is very compact and hard, and the solidity 
: diminishes in proportion to its distance from the surface. 
In some places its consistency is that of paste, remaining 
in the same state in which it was deposited. It is cellular, 
a seooniding send. reel Bavistiles Bnet calor Ee diag 
83 ones with Shantck hee | 
er Spar—occurs in beautiful aoitinn eiyotals, ga 
olor nte—very abundant, sometimes Hee hastsze ene 
ati C Carbonate of Lime—occurs in plates, shots we. 
abun 
Sulp hate of Alumine—very abundant in yellowish white 
Sieeeetitas and efflorescing on mica-slate. Ofien very 
pure, and by lixiviation might be extracted in considerable 
quantity. The mica-slate is extensively impregnated w 
‘it, which renders its texture loose and friable, and subject 
3 os decomposition. It is used by the posing adie ey 3 in dying, 
= and for = bobilge a: apd? 
“ Comson uarts—extensively disseminated, : 
va heed 
— Limpid  Quartz—in Six sided prisms, ¢ of a considerable 
size ; occurs in alluvial one sometimes i in Rees in com- 
epiiasa fioteitone has fataly" coe tried in this town ai a substitut 
tor yea From this experiment it seems to answer oats the gine 
