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The changing color of U.S. sapphires.

Authors
Austin-GT
Source
Colored Stone 1993 Jan-Feb; 6(1):370-371
Link
NIOSHTIC No.
10003391
Abstract
The production of gem-quality sapphire has greatly increased in the United States. The commercial production is from three areas in Montana: Yogo Gulch, Rock Creek, and the Missouri River. Development of technology for heat-treatment of Montana sapphires has enhanced not only their value, but their acceptance by the gem industry.
Keywords
Mineral deposits; Mineral processing; Minerals
Publication Date
19930101
Document Type
Journal Article
Fiscal Year
1993
NTIS Accession No.
NTIS Price
Identifying No.
OP 24-93
Issue of Publication
1
ISSN
1046-462X
NIOSH Division
WO
Source Name
Colored Stone
State
DC
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