By John Watson

ISBN-10: 0727750682

ISBN-13: 9780727750686

ISBN-10: 4114184244

ISBN-13: 9784114184245

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Extra info for British and foreign marbles and other ornamental stones : a descriptive catalogue of the specimens in the Sedgwick Museum, Cambridge

Sample text

The lofty range of Serra de Lonsao in the province of Beira is entirely composed of granite, and contributes its share o f building material. As the specimens shewn indicate, there is but little variation in the colour of these granites, the prevailing tint being an unprepossessing light brownish g r e y ; moreover, the texture of the rock prevents it f r o m yielding kindly to the polisher, consequently it is not 38 IGNEOUS BOCKS (PLUTONIC) m u c h sought after by the decorative builder. The granite is however a useful material for ordinary con­ struction and for engineering work where stability is essential.

A n example is the W e l l i n g t o n Monument in Phoenix Park. The stone was supplied from the Ballyknockan quarries, and was extensively employed for building Trinity College in 1832, and the Museums in 1 8 8 9 . The specimens f r o m the quarries at N e w t o w n b a r r y are typical of the granite worked in Co. W exford f o r local building purposes. Co. Down is largely c o m p o s e d o f granitic r o c k s . Those f o r m i n g the picturesque mountain ranges of Mourne, produce a granite which is sometimes em­ ployed for building purposes, but o w i n g to the numerous cavities it contains, and the distinctively crystalline structure o f the stone, it is n o t ex­ tensively used .

A g r e y biotite-granite exists in the W a n k i e district near the river Gwai, also a pink rock near Manzinyama in the Gwanda district, but as they are n o t yet utilized for building, specimens d o n o t appear in the collection. Mashonaland is rich in granite but at present there are n o quarries. INDIA. Notwithstanding that the Empire of India abounds in plutonic rocks, m o s t o f which are well suited for structural purposes, until lately it has depended largely on Great Britain and other European countries for its supply o f granite for engineering and building p u r p o s e s .

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British and foreign marbles and other ornamental stones : a descriptive catalogue of the specimens in the Sedgwick Museum, Cambridge by John Watson


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