THE MINERALOGY OF SCOTLAND. 437 
PEON ORES. 
Specular Iron. 
Found in the “China-Clay Quarry” near Pitfechie, Monymusk ; this quarry 
is on the west side of the hill of Monymusk, in Aberdeenshire. It occurs 
almost solely filling cavities between quartz crystals. Is in bundles of foliated 
crystals of considerable size ; jet black in colour ; streak brownish ; high lustre ; 
powder orange-red. 
Much of the quartz in the vicinity has a pavonine tarnish ; probably from a 
thin coating of this mineral. 
8. G. 4°583., 
On 1°303 grammes— 
Ferric Oxide, ‘ s , : 81° 704 
Ferrous Oxide, . 7°74 
Alumina, , : : : ! 4°861 
Manganous Oxide, : : 076 
Lime, . : : : : : °601 
Water, 2 ; : 1°178 to 1°868 
Silica, . ; i ; 3° 837 
SOS SIF) 
This used to be regarded as an ore of manganese. Huge rough crystals 
of orthoclase occur in this quarry. 
Specular iron—hematite—occurs in crystals of the 
form drawn, in gneiss, opposite to the Drongs, Hills- 
wick, Shetland. 
Martite. 
This was given me by Professor ARcHER, as having been gathered on the 
sea-shore, on the north-west side of Bute. The parcel consisted of rolled octa- 
hedral crystals ; a considerable portion of several of these was of a red colour 
and a loose structure; the largest quantity, however, was in hard blue-black 
lustrous crystals. A very few of these crystals were feebly magnetic, the 
largest quantity being entirely destitute of magnetism. The powder was red ; 
but in other respects the mineral seemed to be unchanged magnetite, the 
hardness and gravity being normal. The black, lustrous, apparently unaltered 
crystals, were those chosen for analysis. 
