British Mineralogy Or Coloured Figures Intended to Elucidate the Mineralogy of
British Mineralogy Or Coloured Figures Intended to Elucidate the Mineralogy of
James Sowerby
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The British garnets are commonly much the softest, and not valued by the lapidaries. They are chiefly found inclosed in micaceous and granite rocks, though some- times otherwise. Besides the other ingredients spoken of in garnets, the British ones frequently hold particles of mica, and are of a less firm texture. We, however, have the satisfaction to find them present most of the different forms of crystal- lization. We here give a representation of what is reckoned the primitive crystal, (viz.... ) the rhomboidal dodccaedron. These are found in great plenty in the Plum-pudding rocks, as they are called, at Huntly in Scotland. We have bought specimens at sales which are said to come from Bohemia, seemingly of the same sort, and in the same gangue as those from Huntly. The Syrian garnet is of a mort scarlet hue, though I have some cut ones, said to come from Scotland, nearly of the same colour. , but rather less bright. The lower Jigures arc from rocks near the same place in a lighter-coloured gangue (a granite), with the edges of the dodecaedron forming 24 narrow hexaedral facets, in addi- tion to the 12 rhomboidal faces.
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