f)6 TAS:\IAX1AX .MIXKKAl.S. 



was placed beyond doubt. It is remarkable that 

 this is the first cut specimeD which has come under 

 notice. In all probalDility this gem has been looked 

 upon as a pale, transparent corundum, which is 

 comparatively abundant at the locality, as is also the 

 zircon. 



10 Chromiferous Mimetite {Arse7iate of lead with 

 chromic acid.) 

 This variety never assumes the barrel-like shape so 

 common to the typical mineral. It is found in short 

 hexagonal prisms and platesi. with basal terminations, 

 usually about 1 millimeter in breadth and length. The 

 colour varies from a decided brownish-green to deep 

 orange ; it is shining and opaque. The streak is 

 orange to siskin-green. Before the blowpipe in salt 

 of phosphorus it remains green when cold in both 

 flames. In closed tube with splinter of charcoal and 

 heated intensely it gives very strong and character- 

 istic reactions for As. O^ •. with cupric oxide gives 

 flame reactions for CI., aoid in closed tube with mag- 

 nesium wire the odour of P, O,,. It is reduced to 

 metallic lead with soda on coal. This is a variety 

 sufficiently distinct in composition, colour, and habit 

 to be worthy of record. It is rarely me't with at its 

 only locality, and then in comparatively small 

 groups of crystals, but its peculiar colorization, com- 

 bined with the habit of usually occurring in thin 

 plates, at once arrests attention. The chemical 

 reactions shew that it is more allied to mimetifbe than 

 to pyromorphite, a chromiferous variety of which 

 has been recorded. Locality : The Magnet Mine. 



attached to the gossan in the superficial workingg. 



11 Chromiferous Cerussite (Lead carbonate with 

 chromic acid.) 

 This attractive variety of a common species is, so far 

 as known, confined to the Magnet Mine, in the upper 

 workings of which it is, although local, fairly abun- 

 dant. It occurs in fractures and vughs in the gossan 

 zone, but in bunches and sparsely attached as beauti- 

 ful little crystals, generally in close association with 

 crocoisite, but never, so far as observation has gone, 

 intermixed with the normal form ; although this is 

 somewhat abundant in its usual adamantine charac- 

 teristic habit, often shewing remarkably perfect 



