Rutile and topaz in Precambrian gneiss, Jefferson and Clear Creek Counties, Colorado
Circular
567
By: Douglas M. Sheridan, Richard B. Taylor, and Sherman P. Marsh
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Abstract
Disseminated rutile and major amounts of topaz have been identified in Precambrian topaz-quartz gneiss northwest of Evergreen, Colo. The rutile occurs in quartz-topaz-sillimanite gneiss that forms a stratigraphic unit which is 11 to 100 feet thick and is identified along strike for more than 7,000 feet. Three composite chip samples taken across this unit contain 2.2 to 4.2 percent of rutile, by weight, in grains averaging from 0.1 to 0.3 millimeter in size. The topaz content, by weight, in the same samples ranges from 23 to 67 percent.
Suggested Citation
Sheridan, D.M., Taylor, R.B., Marsh, S.P., 1968, Rutile and topaz in Precambrian gneiss, Jefferson and Clear Creek Counties, Colorado: U.S. Geological Survey Circular 567, iii, 7 p. :illus., map. ;26 cm., https://doi.org/10.3133/cir567.
ISSN: 2330-5703 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Rutile and topaz in Precambrian gneiss, Jefferson and Clear Creek Counties, Colorado |
| Series title | Circular |
| Series number | 567 |
| DOI | 10.3133/cir567 |
| Year Published | 1968 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | iii, 7 p. :illus., map. ;26 cm. |