The Elements of economic geology

Bibliographic data

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

Usage license:: Get license information via the feedback formular.

Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part II. Ore deposits

Collection:: Economics Books

CHAPTER IV ORES OF PLATINUM , | ny Bh, z sm WE dt . FV 2 ; z a Yi Ah L Te CR A i EY ae NT SOTA ih Pa Pratinym—Quariries AND Distrisurion—Platinum (Pt. at. wt., 195; sp. gr., 21-5; melting-point, 3200° F.) was Named from its resemblance to silver (diminutive of Spanish- Plata). It is exceptionally heavy, and owing to its high melting-point and resistance to most acids and oxidation, is of special value in many chemical, electrical, and industrial Processes, and for jewelry. Platinum owing to its scarcity and unique qualities, is now the most expensive of ordinarily used metals ; its price has risen from 8s. an oz. in 1870 and £3 an oz. in 1900, to £25 per oz., or five times the value of gold. Platinum has been found in the nickel-iron meteorites, and, being one of the heavy metals and associated with deep- Seated igneous rocks, is probably a constituent of the nickel fon core of the earth. It has been widely regarded as an Igneous mineral, and as a primary constituent of ultra-basic rocks, In many cases it is of hydrothermal origin, and even 0 ultra-basic rocks is sometimes a secondary constituent. Platinum, though scarce in quantity, is widely distributed ; Most of its occurrences are where basic igneous rocks have been raised to the surface by mountain-forming uplifts, and usually those of the Altaid System. Its only British Occurrences are in Southern Ireland and Cornwall, It has been found in most European countries. Russia has been the main producer, and yielded in 1914 over QO per cent. of the world's supply. Platinum occurs in Burma, Central Asia, ang Japan. In North America it has been found in any places among the Western Mountains, and along the Appalachian Mountains, while Sudbury in Canada supplies Most of jtg only important compound, sperrylite (PtAsp). 0uth America was its original home. In South Africa it 65

Access restriction

Copyright

fullscreen: The Elements of economic geology

Monograph

Chapter

Table of contents

Download

Monograph

Chapter

This page

Image fragment

Citation links

Citation recommendation