an uncommon Species of Zeolite. 3^3 



compofed, and found that it confiftcd almoft xvholW of filcK 

 and lime, vvith a certain proportion of icxla. The tullowing 

 were the method? bv which it was analyled : 



I. One lumdred grains, reduced to fine powder in a mortar 

 of flint, were mixed with 500 grains of munatic ac.d and 

 1000 grains of diftiiled water. The powder was imm^iate y 

 attacked by the acid; fome heat and momentary eflervel- 

 cencc were produced, and in a few minutes the filcx appeared 

 floating in a loofe and very divided ftate. The mixture being 

 heated on a fand-bath, became in a fiiort time a ihin tranl- 

 parent jellv. I expofed tliis jelly to a gentle heat (leis than 

 200- of Fahrenheit) till it became nearly dry. Water ys 

 then poured on it, and the mixture, after bemg digefted tor 

 fome time, was filtered. The undlffolved part eoUeaed 011 

 the filler, when fufficiently wafhed, was dried and heated 

 Ted-hot for a quarter of an hour. It weighed 51, grains, 

 was perfedly white, and proved on examination to be pure 

 filex, unmixed with any other earth. 



a The filtered folution, which was tranfparent and nearly 

 colourlefs, after heing lalurated wilh caulUc ammonia, depo- 

 fned afmall quantity of a broxvnidi white precipitate Having 

 collected this precipitate on a filter, and wafhed it, 1 expoled 

 it for a few mmutes to a red heat. It then weighed one graui, 

 and had bec.me brown, and was found to confilt ot halt a 

 grain of oxide of iron, and half a grain of argil. 



C5. In the next place I added a few drops of fulphunc acid 

 to The folution, to difcover if it contained any barytes or Uron- 

 tian. The acid produced no precipitate. 1 he folution was 

 then evaporated to a fmail quantity, and boiled wuh carbo- 

 nate . f :.;i' .monia. Some carbonate of lime was thrown down, 

 which, alter being walhed, and expofed tor a few minutes to 

 a very low red heat, weighed 57 grains. lo drive ort he 

 carbonic acid, and afcertain the real quantity ot hme vUiiUi 

 this precipitate contained, I put it into ^ ^^^fj^ ^'"7,^,^,? 

 Corn.(h clav, which was incloled within a Helhan en c hie 

 and heated k for three hours. The fire was raifed do vly at 

 firll, but was afterwards increafed to 80^ ot WedgwoocL 1 e 

 lime adhered (licbllv, and weighed 3 1^ grams. By teatm^ 

 it with fnlphurrc acid I deictted tome flight traces ot mag- 

 nefia, the felt being wholly convened into ^^'^f '^^^^ ?; '' {'^^^^ 

 4. The ditferent'earlhs having been thus f^T^^'^'^^f^^ J" ^f 

 the^oluliou, ,t was eva,H.rated .0 dryne s tor the pur k c f 

 obtaining the foda, whuh'l had learned by \'^'' Xi\^\^ ,* 

 moms wtuld be wholly taken up with t'^^ "^''^^^^ '^c' ' a 

 of the zeohlc, whcii dceoini)olcd by ue.dg. Alter he c 



|)uratiua 



