Foreign Notices in Mineralogy, &«. 29 
ticed by Count Bournon, and one by Mr. Sowerby. I 
shall designate them by the names of 
Sulphato-corbonnt of led 
: Sulphato-tri-carbonate of iea 
upreous i wah of lead 
ount sia has described the first es as a variety 
of carbonate of lead. The second he calls rhomboidal 
carbonate, and describes it as dissolving more readily in ni- 
iric acid, and with greater effervescence than common car- 
bonate. Its primary form he supposes to be a rhomboid of 
60° and 120°. The third species has been called by Mr. 
ce, in his British Mineralogy, Green Carbonate of 
pets 
Phe diferenee b between the external mechameh of this 
copper. and between 
seen, e to  iiaeciee ieqeersgr 7 of eckstheteleagt, 
tals in nitric acid. The effervescence was cen i 
as described by Count Bournou ; but I was surprised to 
observe, after the effervescence had ceased, a white insolu- 
ble residuum, which, on examination, proved to be sul- 
phate of lead. 
In consequence of the observation of this fact, and of 
per erapinenir amos * on the same specimen of the three 
eties, orauenacareds than Pein examined them all, 
be I believe the following results Semis os =p 
The sulphato-carbonate consists of 1 atom, sulphate nsulpbate of lead. a. 
tiosraacences mnie dissolving in nitric saa kcal 
From Gain Sateiicigaeets. ee es das vaheeince goniom- 
eter on two cleavages 3 Socan the: character: ofa some of its 
lanes and from the e observation of its cleaving 
