28 
ARSENIC. 
665. Native Silver, and Sil¬ 
ver-glance {Sulphide of Silver). 
Dolcoath, Camborne. 
Presented by Captain Petherick. 
666 to 668. Native Silver, 
and Silver-glance. 
Herland Mine,Parish of Gwinnear, 
71 ear Camborne. 
Presented by Vf. J. Hen’vvood, and J. 
Came, P.R.S. 
669. Silver-glance, or vitreous 
silver {Sulphide). 
Lanescot Mines, Power), Cornwall. 
Presented by P, N. Johnson, P.R.S. 
670 & 671. Silver-glance, 
crystallized. 
Cormwall. 
672. Silver-glance, crystal¬ 
lized and massive, vdtli Siderite. 
Huel Brothers, near Callington, 
Cornwall. 
Presented by Richard Davey, M.P. 
Slielf VI. 
673. Silver Ore (Falilerz?). 
In the gossan of cross course. Bea¬ 
con Mine, Lostwithiel, Comiwall. 
Parcels sold at 2SZ., 9Z. and 17Z. per 
ton, August 1855. 
673a. & 673b. Argentiferous 
Gossan, from the Silver Vein 
Mine, near Lostwithiel; and slag 
and metal obtained from same by 
Squire’s process. 
Presented by R. W. Gold. 
674. 675, 676. Pyrargyrite, or 
Ruby-silver, {Sulphide of Silver 
and Antimony,) massive, granular, 
and crystallized, with arsenical 
Pyrites. 
Dolcoath yiine, Cambomie, Cornwall. 
Presented by Captain AV. Petherick. 
677. Pyrargyrite, fine crystals 
in a cavity in Siderite. 
Huel Duchy, Callington, Cornwall. 
678. Pyrargyrite, wdth Side¬ 
rite (Spathose iron). 
Huel Brothers, Callington. 
Presented by R. Phillips, P.R.S. 
679. Pyrargyrite, incrusting 
white Killas. 
Huel Brothers, Callington. 
680 & 681. Pyrargy'rite, 
massive, and crystallized upon 
arsenical Pyrites. 
Dolcoath, Camborne. 
Presented by Captain Petherick. 
682 683. Arsenical Silver 
Ore. 
Dolcoath. 
Presented by Captain W. Petherick. 
684 h 685. PIorn - Silver 
{Chloride of Silver), crystallized 
and massive. 
North Dolcoath Mine, Camborne. 
Presented by Richard Pearce. 
No. 684 being part of the first stone 
found by Captain N. Thomas, 1859. This 
rich ore formed a “ bunch” at and above 
the 10-fathom level, and “cut out” 
entirely on all sides. 
686. Horn-Silver, delicately 
acicular, in Iron Ochre. 
Mexico Works, Cornwall. 
Presented by G. B. Greeuough, P.R.S. 
Shelf VII. 
Various specimens of Silver 
Ores, 
From the Isle of Sark. 
Presented by P. N. Johnson, P.R.S. 
687 to 689. Horn-Silver, and 
Carbonate of Lead. 
Sa/Ps Hope Mine. 
690 to 694. Silver Ore, con¬ 
sisting chiefly of Argentiferous 
Galena. 
695 & 696. Freieslebenite ? 
(Sulphide of Silver, Lead, and An- 
timon}^), with Iron Pyrites in the 
one, and Galena in the other 
specimen. 
From the 30 arid 50fathom levels, 
Sark’s Hope Mine. 
697. Carbonate and Arseniate 
of Copper, argentiferous. 
Le Pot Copper Lode Cattina, 
Sark’s Hope. 
Shelf VIII. 
Arsenic. 
Arsenical Iron Pyrites (Mispickel), is employed for the preparation 
of Ar senic, of which it yields about 45 per cent. 
