LEAD ORES. 
85 
Copper Pyrites, and in dark por- 
phyritic rock. 
From Neivtonards, North Ireland. 
Presented by J. Taylor, jun., F.G.S. 
144. Galena, well crystallized 
on Quartz. 
Luganiire Old Mine, Co. Wicklow. 
Presented by G. B. Greenough, P.R.S. 
145. Galena. 
Castlemaine, Co. Kerry. 
Presented by G. B. Greenough, P.R.S. 
146 & 147. Galena, coarsely 
granular. 
Ballyhicky Mine, Co. Clare. 
Presented by J. Taylor. 
The following ores of lead are found in smaller quantities and fewer 
localities than the Galena, and all of them which follow Bournonitc 
are characteristic of moderate depth and of those portions of mineral 
veins where the original ore has been subjected to changes. 
Bournonite, a definite com¬ 
pound of lead, copper, antimony, 
and sulphur, in the following pro¬ 
portions :— . 
Sulphur - - 19*72 
Antimony - - 24*71 
Lead - - - 42*54 
Copper - - 13*03 
100 
Anglesite, {Sulphate of lead,) 
so called from the Isle of Anglesey, 
one of the first localities where it 
Avas observed. 
Sulphuric acid - 26*4 
Protoxide of lead 73*6 
Cerusstte, ( Carbonate of lead,) 
found occasionally in large quan¬ 
tities, and valued for producing 
a lead of pure quality. Like the 
last it crystallizes in forms of the 
prismatic or rhombic system. 
It contains,— 
. Carbonic acid - 16*42 
Protoxide of lead 83*58 
The names Vanadinite, Pyro- 
MORPHiTE, and Mtmetite are 
given to the compounds of oxide 
of lead with vanadic acid, with 
phosphoric acid, and arsenic acid, 
resjAectively. The second name 
is derived from pur, fire, and 
y.op(f)7], morphe, shape, from its 
assuming crystalline forms when 
heated ; the third from 
mimetes, an imitator, from assu¬ 
ming similar forms to the last. 
These two, variously called from 
their colours, green, broAvn, and 
yelloAv lead ores, crystallize in 
hexagonal prisms. 
Kampylite, from liam- 
piilos, curved, in consequence of 
the curvature of the crystal faces, 
is a compound of arsenic and phos¬ 
phoric acids Avith oxide of lead, 
coupled Avith chloride of lead. 
It may probably be regarded 
only as a variety of the Mimetite. 
Shelf V. 
148. Bournonite {Antimonio- 
cupriferous sulphide of lead), 
crystallized with Iron Pyrites. 
Herodsfoot Mine, near Liskeard, 
Coriiwall. 
149. Anglesite {Sulphate of 
lead). 
Mona Mine, Anglesey. 
Presented by F. Webster. 
150 to 150b. Anglesite, crys¬ 
tallized. 
Pary's Mine, Anglesey. 
151. Anglesite, an unusually 
fine group of Crystals. 
Cromford, Derbyshire. 
152. Caleuonite {Cupreous 
Sulphato-carbonate of Lead). 
Pedgill, Cumberland. 
153. Linarite, {Cupreous sul¬ 
phate of lead,) in very fine crys¬ 
tals. 
Pedgill, Cumberland. 
154. Linarite, crystallized. 
Lead Hills, Lanarkshire. 
154a. Leadhillite {Sulphato- 
tricarbonate of lead). 
Lead Hills. 
155 and 155 a. Vanadinite 
( Vanadate of lead), in implanted 
globules. 
Wanlock Head, Dumfriesshire. 
155 b. Vanadinite, in crystals. 
Wanlock Head. 
