Petralogy. A Treatise On Rocks (Volume 2)

Auteur:
John Pinkerton
ISBN:
9780217974738
ISBN10:
0217974732
Taal:
Engels
Bindwijze:
Paperback
Publicatiedatum:
01-02-2012
Geillustreerd:
Nee
Pagina's:
132 pagina's

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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: HTPONOMB I. Garnet, in a base of siderite. HYPONOME II. Siderite, in a base of garnet. Siderite, with garnet rock, from Scotland. The same, from Sweden. NOME II. SIDERITE, FELSPAR, GRAPHITE. A little chain of rocks, amidst the eternal snows of Mont Blanc, consists of laminar black or green siderite, felspar, and graphite, with a little quartz and mica. NOME HI. SIDERITE, UNCTUOUS QUARTZ, PYRITES. Mont Broglia, a southern spur of Mont Blanc, is of a stone softer than granite, being a mixture of siderite, felspar, mica, unctuous quartz, and pyrites f. Sauss. IQ74. f Ib. 911. chapter{Section 4NOME IV. PORPHYRY, WITH CHALCEDONY. The green porphyry, in particular, sometimes appears spotted with chalcedony, so as to assume the form of a composite rock. Ferber, it has been already .observed, saw numerous blocks of green porphyry at Ostia, the sea-port of Rome, where they had been disembarked in ancient times, and neglected after the empire fell a prey to barbarians. NOME V. JASPER, WITH AGATE AND CHALCEDONY. This curious rock is described, by Petrini, as consisting of these three substances, in veins of white, green, red, yellow, purple. It admits a beautiful polish, and is found at Monte Rufole, in the Volterranof. In the noble collection of Besson, at Paris, there is a specimen joined with pure transparent quartz, which had probably paued as a vein through the rock. t Gabinetto Nazareno, Roma 179$, 2 vls- 8v- ' 258- chapter{Section 5NOME VI. MICA AND ACTINOTE. A composition rather uncommon, but found in primitive regions, abounding in mica slate. Mica and actinote, from Mount St. Gothard. NOME VII. ACTINOTE, SIDERITE, MICA. A composite rock of delphinite or actinote, greenish siderite, felspar, and white mica, all in little gr...


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Algemene informatie

Titel:
Petralogy. A Treatise On Rocks (Volume 2)
ISBN:
9780217974738
ISBN-10:
0217974732
Auteur:
John Pinkerton

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