The Elements of economic geology

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Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Part III. Earthy minerals

Collection:: Economics Books

[74 ECONOMIC GEOLOGY tension; and as the material is not plastic it remains friable so that all the surface is reached by the liquid that is being filtered. England formerly produced the largest quantity, which mainly came from a bed known as “the Fuller's Earth ” in the Lower Oolite of Wiltshire. Its existence led to the establishment there of the early woollen industry. The second important English deposit is in the Lower Green. sand of Nutfield and Reigate in Surrey. In America Florida earth is largely used for the discoloration of oils. .The American fuller’s earths are very varied in character and origin ; that in Arkansas occurs in veins formed by the altera- tion of basalt dykes; the Bentonite of Tennessee is an altered volcanic ash; that of Massachusetts is a glacial silt. The production of fuller's earth in* England in recent years has varied from about 20,000 to 30,000 tons, and its price has been about £2 per ton.

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