Statistics. Grey. Blackish. Chalcedonic quartz. In Gairloch 

 in Ki^s-shire; on Ben Lair in the same county, in 

 gneiss. The colour varies from very pale to very dark 

 blackish grey, and the specimens are also exceedingly 

 various in their degrees of transparency. 



Black. Common transparent quartz, apparently co- 

 loured by an intermixture of hoi nbli-nde, just a* it is 

 sometimes coloured green by actinolite. The fine 

 splinters are translucent. In Ben Lair, in Hostushire, 

 in hornblende schist ; but it seems very rare. 



Broivn. Transparent quartz. The colour varies in 

 intensity, but the colouring ingredient is not known. 

 It is discharged by a moderate heat. It is found crys- 

 tallized, notedly in Cairngorm, in granite. In Arran, 

 and in Benna-Chie, in granite. In St. Kilda, in that 

 syenite which is connected with augite rock and green- 

 stone. At Killin, perfectly transparent, but un crys- 

 tallized ; in nodules in chlorite schist. In Noith Rona, 

 in granite veins, uncrystallized. 



Yellow. A brownish yellow crystal occurs in the 

 hills of Mar. Yellow quartz, imperfectly transparent 

 and full of fissures, is not uncommon in the Perthshire 

 hills, but it seems in general to have been coloured 

 somewhat recently, by having admitted a stain from 

 the rust of iron. 



Colourless or greenish. White amethyst. In Fife, 

 and in the hill of Kinnoul. 



Colourless. Transparent. The crystallized kind is 

 too common to deserve notice ; but as it is rarely 

 transparent when in veins and nodules, I may here re- 

 mark that it occurs in this manner in the chlorite schist, 

 at the south-eastern extremity of Jura, and the north- 

 eastern of Isla. 



Granular white quartz, resembling refined sugar, is 

 found in Harris, and in Ben Lair, in veins traversing 

 gneiss. There is here also found a singular variety, in 

 which a purely hyaline quartz passes gradually into 

 this snow-white and finely granular kind. It is unne- 

 cessary to point out the localities of the other varieties, 

 which abound everywhere. 



FELSPAR. 



Felspar. As in the case of quartz, I shall here only notice the 



most remarkable and most rare varieties of this mine- 

 ral. I may remark, generally, that they are princi- 

 pally found in those districts which consist of gneiss, 

 and are almost always integrant portions of the granite 

 veins with which that rock abounds. 



Pure while. Opaque. At Hillswick, in Shetland, 

 intermixed with actinolite, and very splendent. At 

 Cape Wrath, in granite veins. In Coll, Harris, and in 

 Arisaik. 



White. Translucent where thin ; splendent and re- 

 flecting much pearly light from the interior. This 

 very beautiful variety occurs in Harris, on the south- 

 ern side of Roneval. The ordinary white variilic-, 

 under many different aspects, are too common to re- 

 quire particular notice. 



White. Crystallized. In Cairn Lia, one of the sum- 

 mits of Ben-y-gloe, in micaceous schist. In Aberdeen- 

 shire, not very uncommon ; particularly in the granite 

 of Bennachie. 



Flesh-coloured. A brownish flesh-coloured variety, 

 characterized by a high degree of transparency, and 

 pearly lustre in the thin fragments, occurs in east 

 Rona. A very beautiful yellowish flesh-coloured and 

 similarly splendent variety abounds in North Rona. 

 This colour is here distinguished for its peculiar purity 

 and beauty, compared to the ordinary colours of felspar. 



SCOTLAND. 



627 



lllue-grey. This variety alto abound* in North 

 ', Inn 1 have never observed it elsewhere. 



Brick-red. Very bright. Thii occurs in Lewis, in 

 Ardgower, and in Shetland, but is rare, Red* declm- 

 in this in brightness and purity, are too com- 

 mon to require not 



I'urple-ltromn. In Erifka and Fudia, and lew per- 

 fect in Coll. 



Brotvnith-grey. Inclining to purple in some in- 

 stance*, and resembling that of a Labrador, but not 

 iridescent In Sky, in veins in hypersthene rock, and 

 in Rum. In Aberdeen oh ire. 



Glatsy Felipar. In the basalts and clay-Uones o'f 

 the western islands in general. Very large in the clay- 

 stones of Blaven in Sky. 



COMPACT FELSPAR. 



Bright green. In lona, and in Tirey, in gneisi. 

 Very abundant in the same rock at Loch Greinord, 

 and generally on the western coast of Ross-shire. In 

 different parts of Inverness -shire and Aberdeenshire, 

 but more rare. This mineral has hitherto been mis- 

 taken for quartz and for epidote. 



Lead-grey, In Loch Maree, in Ross-shire. 



Brown-purple. At Pol Ewe in Ross-shire. These 

 two resemble precisely the compact felspars of Sweden. 



While. In lona. In West Rona, in North Uut. 

 This is an extremely beautiful tubstance, and it also 

 occurs in Sweden ; but I have never yet teen sped* 

 mens from any other place or country. 



HORNBLENDE. 



-Crystallized in East Rona; also in Ben Ltir. '[ . 



Plattf and splendent. Dark green, resembling dial- blend*, 

 lage ; in Coll. 



Finejbrous. Resembling black satin, in Perthshire. 

 In general it is too common, under its ordinary forms, 

 to require further notice here. 



Fine fibrous radiated. In clay-slate at Boharm, in 

 Banffshire. This is a very singular and beautiful va- 

 riety ; putting on many remarkable forms, and, as far 

 as I know, peculiar to this spot. 



Pargasile. In Tirey, in white marble. The cha- 

 racters are extremely well marked. 



ACTINOLITE. 



Intermixed in large crystal*. Either alone, or tm- Actiaolitc. 

 bedded in talc. In Glen Elg near Eilan Reoch. In 

 Isle Oransa in Sky. At Hillswick in Shetland. 



Fibrous. Continuously straight, curved, or undu- 

 lated. In Glen Elg, and in Aberdeenshire. 



Schistose. In Glen Elg ; very finely laminar. In 

 Sutherland, in Shetland, in Nether Lorn. 



Shirt Jibrous entangled. In Glen Elg. In Isle 

 Oransa. Near Fcdaland in Shetland. 



Flat ptaty, entangled. In Isle Oransa. 



Finely stellated, entangled. Near Fedaland in Shet- 

 land ; near Blair in Atholl. 



Nearly pulverulent, and very pale. In Shetland, near 

 Burra Voe. The stellated and this la>t are extremely 

 beautiful and singular minerals, to which I have seen 

 no resemblances among foreign specimens. 



Nearly tv/tiie. Crystallized entangled. Near Handa 

 in Sutherland. In this case there is a near approxi- 

 mation to tremolite ; and it may even be doubted whe- 

 ther there are any essential differences. 



