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GEOREF RECORD

Clinochlore from the Silver Star District, Madison County, Montana

R. B. Berg
Clinochlore from the Silver Star District, Madison County, Montana
Clays and Clay Minerals (August 1986) 34 (4): 496-498

Abstract

Almost monomineralic clinochlore is mined at the Golden Antler mine, 40 km SE of Butte, its light colour allowing it to be used in some of the same applications as talc. The greenish grey clinochlore occurs as near-vertical veins up to 10 m thick in an Archaean feldspathic gneiss; it has average refr. ind. 1.583, and its indexed XRD powder pattern shows it to be the IIB polytype (A.M. 47-819). Two chemical analyses are reported, giving a half-cell formula 298(Al (sub 1.35) Fe (super 3+) (sub 0.06) Fe (super 2+) (sub 0.02) Mg (sub 4.27) )(Al (sub 1.13) Si (sub 2.87) )O (sub 10) (OH) (sub 8) .


ISSN: 0009-8604
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 34
Serial Issue: 4
Title: Clinochlore from the Silver Star District, Madison County, Montana
Author(s): Berg, R. B.
Affiliation: Mont. Bur. Mines and Geol., Butte, MT, United States
Pages: 496-498
Published: 198608
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 8
Accession Number: 1987-007585
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2
N44°42'00" - N45°52'00", W112°43'60" - W111°22'00"
Source Note: John Hower Memorial Issue
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1987
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