66 REPORT<1863. 
boyle; Welchtown; Malinbeg; Abbey Lands and Abbey Island, Bally- 
shannon; Ballymagrorty ; Finner; Tonregee ; Glentogher, Carndonagh ; Cas- 
tlegrove, Letterkenny. (Griffith’s “‘ Mining Localities of Ireland,” Journ. 
Geol. Soc. Dub. vol. ix. p. 148.) 
Motyspentre. In hexagonal plates with actynolite, disseminated through 
elvan at Lough Laragh*, near Glenties; at Lough Anure. 
Note.—Molybdenite also occurs in the oligoclase veins at Garvary*, near 
Castlecaldwell, two miles from the county of Donegal. 
Brenpe. Occurs with galena at several of the localities mentioned for that 
species, especially Kilrean* and Fintown. 
Copprr-Pyrires. Not very common; occurs crystallized at Kildrum. 
Tron-Pyrires. Cubes of iron-pyrites are abundant in the mica-slate and 
accompanying rocks, in various parts of the county, particularly near Killy- 
begs* and at Culdaff* and Malin. At Crohy Head* large crystals occur in 
the soapstone. 
Macenettc Pyrrres. Occurs in detached crystals in the metamorphic rocks 
about the Barnesmore Mountains, and at Leaght; at Doorin Rock*. The 
variety found at Barnesmore contains traces of nickel and cobalt. 
Frvor Spar. Occurs in the limestone near Donegal; the variety is phos- 
phorescent; at “the Pullans”; at Rathmullen. 
OxipEs (Merarric). 
Rurite. Prisms of this species occur in quartz-pebbles in the River Dale, 
and in mica-slate in Arranmore; at Malinbeg, large prisms in quartz (Greg 
and Lettsom); at Ards. 
Sappuire. A few rolled crystals were brought from the county of Donegal 
by R. Townsend, Esq., and given by him to Professor Apjohn. Precise 
locality not known. 
Maennric Iron. Octahedral crystals occur in the syenite at Horn Head*, 
and throughout the Dunfanaghy district. Also in serpentine at Aghadoey*, 
and in anthophyllite at Crohy Head*. 
Inmentre. Plates of this species, called rutile by Sir C. Giésecke, occur in 
quartz at Woodland Dooish, near Stranorlar; and at Edergole, near Corabber 
Bridge, Lough Eask; at Breaghy Head. 
SpecutaR Iron. At Glenkeeragh and Fox Hall. 
Micacrovs Iron. Near Malin*, and at Croaghonagh Quarry*, Lough 
Mourne. 
Rep Hamarire. At Innishkeel; pseudomorphous in cubes, replacing iron 
pyrites, at Woodland Dooish, near Stranorlar. 
Brown Hamarrrse. At Malinbeg, in a lode. 
Bog Iron Ore.—Very abundant throughout the mica-slate district of the 
county. 
~ PsrtomEtANE. Impure psilomelane occurs in Arranmore and in the Slieve 
League district. 
Oxipxs oF Srrtcon, &e. 
Quartz. Rock Crystals—Leabgarrow*, Arranmore Island (very fine) ; 
Slieve League. 
Rose Quartz.—Bradlieve Mountain, near Ballintra; in veins in granite, 
Pollakeeran Hill, near Lough Mourne; Maghery. 
Amethyst.—In veins in granite, at the Waterfall in Barnes River*, half a 
mile above Barnes Lough, and on Edergole Mountain. 
Smoke Quartz—Very fine crystals, with graphic granite in a yein at 
