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History of the Colorado-Wyoming state line diatremes.

Rocks & Minerals

By:
,

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Abstract

Although >90 kimberlite diatremes have been found in the area, it was not until after 1963 that these bodies were correctly identified. The presence of large inclusions of sedimentary rocks had hindered their recognition. In 1975 a diamond crystal <1 mm was accidently discovered while thin-sections were being made of rock from the Shaffer 3 body in Albany County, Wyoming. Subsequently additional diamonds from other localities in the area were identified. The diamonds usually range 0.2-2.0 mm (a few >3.5 carats). They are usually colourless, but light-brown, blue-white, pale orange, pale to bright yellow and nearly black crystals occur. Associated minerals, including chrome-diopside, chromite, magnesian ilmenite, pyrope and omphacite, are described.-R.S.M.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
History of the Colorado-Wyoming state line diatremes.
Series title:
Rocks & Minerals
Volume
59
Issue:
1
Year Published:
1984
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
35
Last page:
37
Number of Pages:
3