| Title | Cordierite-anthophyllite skarn, Betty Mine, Guffey, Park County, Colorado |
| Description | This sample from the Idaho Springs Formation contains coarse blades/prisms of tan anthopyllite. The finer material is mostly muscovite, biotite and quartz, but also includes subtle glassy to subvitreous blue and gray cordierite. The sample is 9 cm across. |
| Chronostratigraphy | Precambrian |
| Lithostratigraphy | Idaho Springs Formation |
| Location | USA ▹ Colorado ▹ Park. Near Guffey. Betty Mine. |
| Photographer | Nessa Eull. 2001-04-10. |
| Collection | Ward’s Collection of Classic North American Rocks #88. |
| Key words | cordierite, anthophylite, skarn, Colorado |
| Tech details | 1.29 MB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 337 |
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