OF MERCUKY AND ARSENIC. 
87 
737. Cinnabar, veins in Grey- 
wacke Slate. 
Idria, Carniola. 
738 & 739. Cinnabar. 
Deux Fonts, Germany. 
Presented by G. B Greenough, F.R.S. 
740 & 741. Cinnabar. 
Almaden, Spain. 
Presented by Don Casiano de ^rado. 
742. Cinnabar, in sandstone. 
Almaden, Spain. 
743. Cinnabar. 
Almaden, Spain. 
744 & 744a. Cinnabar. 
Almaden, Spain. 
Presented by Sir W. E. Logan. 
745. Cinnabar. 
California. 
746. Cinnabar. 
New Almaden, Califoryiia. 
747 & 748. Cinnabar. 
California. 
Nos. 746 to 748 presented by Dr. 
Bowring. 
749. Cinnabar, with rich 
coloured Native Vermilion. 
Los Frayles, Chanarcillo, Chile. 
Presented by H. R. H. Prince Albert, 
Shelf VI. 
750 & 751. Cinnabar. 
752. Cinnabar. 
California. 
753. Cinnabar. 
California. 
Presented by Dr. E'orbes. 
754. Cinnabar. 
New Almaden, California. 
Presented by Frederick A. Carrington. 
Ores of Arsenic. 
Native Arsenic, a mineral which has been found in small pieces at 
extremely rare intervals in some of our British mines, is frequently 
found associated with the rich silver ores of several foreign districts. 
But Arsenical Iron Pyrites, or Mispickel, and Lolingite (see p. 72) are 
the minerals commonly used for the production of Arsenic for commer¬ 
cial purposes. 
The beautiful mineral Realgar, which when fresh exhibits a bright 
Aurora-red colour, decomposes so readily on exposure, that all the line 
specimens presented to the Museum but a few years ago, will be found 
to have become yelloAv and powdery, and the valuable present. No. 761, 
is necessarily covered in order to aA^oid destruction by the light. 
Shelf VII. 
755. Native Arsenic, mam- 
millated. 
Andreasberg, Hartz. 
756. Orpiment {Tersulphide 
of Arsenic), 
Tajowa, near Neusohl, Hungary. 
757. Natia^e Realgar {Bisul¬ 
phide of Arsenic.) 
Nagyag, Transylvania. 
758. Realgar, crystallized. 
Nagyag. 
759. Realgar, massive. 
China. 
760. Realgar. 
China. 
Presented by C. Button. 
761. Realgar, Avorked into a 
vase by the Chinese. 
Presented by Colonel Guthrie. 
