Skip to Main Content
Skip Nav Destination
GEOREF RECORD

The Fe-Ni-S system, and introduction with new data on the crystallization of pyrrhotite and pentlandite

James Edwin Hawley, Gordon L. Colgrove and Homer F. Zurbrigg
The Fe-Ni-S system, and introduction with new data on the crystallization of pyrrhotite and pentlandite
Economic Geology and the Bulletin of the Society of Economic Geologists (August 1943) 38 (5): 335-388

Abstract

Mineralogic problems involved in the Fe--Ni-S System are listed and a critical review of both mineralogic and metallurgical data on the system is given. New experimental data obtained from melts of FeS and NiS are presented together with results of an experiment to test the immiscibility of these sulphides. For low-sulphur, iron-nickel melts confirmation is obtained that FeS (pyrrhotite) enters into a peritectic reaction with a nickel-rich liquid to form a ternary solid solution which on final cooling is equivalent to pentlandite. Though natural pentlandite appears to have a constant composition (Fe, Ni) (sub 9) S (sub 8) with Fe: Ni = 10:11, synthetic pentlandites have been prepared from melts ranging in composition in one series of experiments from 45FeS-55NiS to 10FeS-90NiS. In another series, with probably lower sulphur, a compound, close to 30FeS-70NiS, approximating the compound (FeS) (sub 2) Ni (sub 3) S (sub 2) (in Fe:Ni) and indistinguishable from pentlandite by x-ray methods, was obtained. Cooling curve data suggest that while the peritectic type of crystallization may occur with low sulphur, a solid solution series between iron and nickel sulphides may form over a still wider range. Confirmation of this will be presented in a later paper by Colgrove.The textural relations of natural pyrrhotite and pentlandite are reviewed and new evidence for a natural, nickeliferous-pyrrhotite solid solution given. On the basis of studies of natural ores and experimental data, the mode of crystallization of non-aqueous, iron-nickel, sulphide liquids is traced and the importance of sulphur content stressed. No evidence is found that such sulphide liquids are immiscible.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 38
Serial Issue: 5
Title: The Fe-Ni-S system, and introduction with new data on the crystallization of pyrrhotite and pentlandite
Pages: 335-388
Published: 194308
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
Accession Number: 1949-007147
Categories: Economic geology, general
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N42°00'00" - N57°00'00", W95°00'00" - W74°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1949
Close Modal

or Create an Account

Close Modal
Close Modal