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PITCHSTONE. 279 Geognostic Situation. It occurs in veins that traverse granite; and also in beds in the second porphyry formation. In floetz coun try, it appears in beds and veins in the first or old red sandstone formation, and in veins and imbedded portions ia floetz-trnp rocks. Geographic Situation. Europe.—Pitchstone occurs in considerable abundance in different parts of Scotland. In the Island of Arran it traverses granite in the form of veins; in the red sand stone of that island it appears in beds, and veins of very considerable magnitude ; and in small veins in the trap rocks of the Isle of Lamlash. In the islands of Mull, Canna, and Skye, it occurs either imbedded, or in the form of veins, in floetz-trap rocks. Near Eskdalemuir, in the mountainous part of Dumfriesshire, it rests upon transition rocks, and is associated with lloetz-trap rocks. I am told that it occurs in trap rocks in Ardnamurchan in Argyleshire. I)r Macculloch found it in granite near the summit of Cairngorm; and Mr Murray, Lecturer on Chemistry, several years ago observed black pitchstone amongst trap rocks on the summits of the Cheviot Hills *. In Ireland, it occurs in a vein traversing granite, in the Townland of Ncwry where it was first observed by Mr Joy of Dublin. It occurs in the Island of Iceland in floetz-trap rocks |. S 4 Tbi* * Vid. Jameson’s Mineralogical Travels; and Mineralogical Desciiptlon Dumfriesshire. , i" Fitton’s Mineralogy of Dublin, p. 53- i Sir George Mackenzie's Travels in Iceland.
