| 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. |
| Genre: | Article |
| ProdID: | 70013277 |
| Citation Author: | Collins, D. S.; Heyl, A. V. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 37 |
| Citation Issue: | 1 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Rocks & Minerals |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 3 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | History of the Colorado-Wyoming state line diatremes.; 1984; Article; Journal; Rocks & Minerals; Collins, D. S.; Heyl, A. V. |
| Citation Start Page: | 35 |
| Citation Volume: | 59 |
| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | History of the Colorado-Wyoming state line diatremes.; 1984; Article; Journal; Rocks & Minerals; Collins, D. S.; Heyl, A. V. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1984 00:00 -0600 |
| Publisher: | |
