1802.] 
wife fent to the Council of Mines by M. 
the Baron de Molt. Cit. Vauquelin has 
found init, as wellas Klaproth, the union 
of falphate of lime with muriate of foda, 
which gives to the former the property of 
eryftallizing in cubes ; but he has further 
remarked, that roo grains of this fub- 
ftance, broken in {mall pieces, expofed to, 
the moft violent fire during half an hour, 
lof nothing of their weight ; they only 
became a little opaque. It is fingular 
enough to fee a cryftallized falt entirely de- 
prived of water of cryftallization, although 
this falt is compofed of two other falts, 
which ufually contain a pretty large quan- 
tity of ir. 
Citizen GitLeT has read a Note on the 
difcovery of emeralds in France. 
Citizen Lelievre, member of the Coun- 
cil of Mines, going from Paris to Limo- 
ges, found, on fome ftones defigned for 
repairing the road, fome prifms, fuffici- 
ently charaéterifed to be eafily ditinguifhed 
by him, and afterwards by Citizen Haitiy, 
for the beril or emerald. The analyfis 
which Citizen Vauquelin has made of this 
fubftance, has confirmed this difcovery, 
by demonftrating that there is glucine 
found in thefe cryftals, an earth characte- 
riftical of the emerald. Among the fub- 
filances which have been thought foreien 
to the foil of France, this is not the only 
one that has been difcovered of late in that 
country. Citizen Gillet mentions the fol- 
lowing mineral fubftances which have been 
found a little before the Revolution :— 
arragonife, anatafe, koupholite, ftilbite, 
dypire, minitite filex, phofphate of lead, 
native antimony, iron carburé or plomba- 
gine. Since that epoch, andnotwithftand- 
ung the {mall number of journies made by 
fcientific men, there have been found the 
dolomie, a porphyroid rock witha calca- 
reous bafe, the fulfate ftrontaine, the 
quartz avanturine, the anthracite, the fer- 
ruginated{fcheelin (wolfram),the oxydated 
titane, oxydated antimony, chroated iron, 
oxydated urane, and arfeniated lead. 
=e 
ROYAL SOCIETY or EDIN- 
BURGH.* 
CHEMISTRY AND SURGERY. 
N Dr,RoBert Kennepy’s * Chemi- 
cal Analyfis of an uncommon Species of 
the Zeolite,”’ after a defcription of the place 
where it was found—of the fhape and ar- 
rangement of its fibres, which he con- 
* Vol. v. Part ii, of the Tranfaftions of 
this Society, 1802. - 
Proceedings of Learned Socictiese 
423 
ceives to be plainly the effects of cryftal- 
lization—the following curious properties 
are mentioned as belonging to this {pecies: 
It appears luminous in a dark place, both 
by friétion and heat : a very flight degree 
of friétion produces this effect ; for a per- 
fon can eafily diftinouifh a phofphoric 
light, even if he only draw his finger acrofs 
it. When ftruck with a hammer in fuch 
a manner that finall fragments are driven 
off, they appear luminous in pafling 
through the air, and continue to thine 
for amoment after falling tothe ground : 
and a hard body drawn over it leaves a 
track of light, which remains a fecond or 
two vifible. When a piece of the ftone 
is pounded quickly in a mortar, a ftrong 
‘light is emitted ; but, after being wholly 
reduced to powder, it no longer fhines. 
Small fragments of this zeolite, placed 
on hot iron or clay, become luminous ; 
but being once made red-hot, it is depriv- 
ed of the property of giving light after- 
wards by heat, though it fill appears 
faintly luminous by friction. 
It can be melted inte glafs, the tranf 
parency of which is imperfect on account 
of many minute air-bubbles. When 
ground to powder, and mixed with a pro- 
portionate quantity of the fulphuric, ni- 
tric, or muriatic acids, the mixture be- 
comes a firm jelly in a few minutes.— 
That which is formed by the nitric or mu-: 
riatic, is nearly tran{parent ; but, as the 
ftone contains a confiderable quantity of 
lime, that formed with the fulphuric is 
white and opake, on account of the ful- 
phat of lime which is generated. 
According to Dr. Kennedy’s experi- 
ments, which are given at length in this 
paper, 100 grains of this zeolite con- 
tain ) 
Silex e ° 
: ° 5 T 75 
Lime : 2 3 Boi, 
Argil : . . is 
Oxyd of iron . . °5 
Soda, about ° ore 
Carbonic acid, and other 
volatile matters . t 
98. 
with fome traces of magnefia. 
Objervations by Dr. Kennedy.—This 
ftone refembles fome of the varieties of 
the Tremolite, mentioned by Sauffure, in 
the property of giving a phofphoric light 
by friftion. Its {pecific gravity is greater 
than that of the zeolites in general ; in 
other refpects ithas the principal charac 
ters of a zeolite, in haying been found in 
a whin 
