On Spinel and Forsterite from the Glenelg Limestone (Inverness-shire)

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Abstract
T he primary object of this communication is to describe the occurrence of two minerals—forsterite and true spinel—which are found in dose association in a limestone in Glenelg (Inverness-shire), but which do not appear to have been recorded hitherto in Scotland. Before tabulating the analyses, however, it may be well to mention what has been previously written about the limestone, and to describe to some extent its geological position and chief characters. The exposure from which the minerals were obtained is on the southern side of the Big Glen, or Glenmore, of Glenelg, and it lies at a distance of rather more than 2/3 mile east of the top of Sgiath Bheinn (1-inch map 71, Inverness-shire 6-inch map 47). The limestone-band to which the exposure belongs can be traced, without any considerable interruption by faulting, for nearly a mile. Its general direction is slightly east of north, and the width of outcrop varies from a few yards up to 30 or 40. This limestone is one of a group of limestones which have long been known, and are noted for the variety of minerals that they contain. Macculloch, in his description of Tiree, states that ‘sahlite, accompanied by tremolite and forming large nodules in Primary limestone,’ occurs in Tiree, Harris, and Glenelg, and that coccolite and mica, in small crystals of a talcose aspect, are found in the limestone in Tiree and Glenelg. Murchison also speaks of the same limestone-group in his account of the ‘Succession of the Older Rocks

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