Photomicrograph: lean iron ore from Caribou, showing magnetite and ilmenite, augite and serpentine, black areas are magnetite and ilmenite, white areas are serpentine formed by alteration of olivine; some unaltered olivine remains and is gray. Colorado. Circa 1911.

Dates

Date Taken

1911

Summary

Photomicrograph: lean iron ore from Caribou, showing magnetite and ilmenite, augite and serpentine, black areas are magnetite and ilmenite, white areas are serpentine formed by alteration of olivine; some unaltered olivine remains and is gray. Colorado. Circa 1911. Plate 11-C, enlarged 29 diameters, in U.S. Geological Survey. Professional paper 94. 1917.

Summary

Photomicrograph: lean iron ore from Caribou, showing magnetite and ilmenite, augite and serpentine, black areas are magnetite and ilmenite, white areas are serpentine formed by alteration of olivine; some unaltered olivine remains and is gray. Colorado. Circa 1911. Plate 11-C, enlarged 29 diameters, in U.S. Geological Survey. Professional paper 94. 1917.

Contacts

Data Owner :

U.S. Geological Survey

Photographer :

Bastin, Edward Sunderland

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Related External Resources

Type: Web Link

Economic geology of Gilpin County and adjacent parts of Clear Creek and Boulder Counties, Colorado

https://pubs.usgs.gov/pp/0094/report.pdf

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Categories

• Image

category

• Photographers
• Photomicrographs
• Professional Papers

label

• photo print

collection

• Bastin, E.S. Collection
• Colorado Professional Paper 94

Provenance

Additional Information

Identifiers

Type	Scheme	Key
name	photoLibrary	bes00244
number	photoLibrary	3763
batch	photoLibrary	btch256
number_in_book	photoLibrary	244