Several summers ago while engaged in professional work in the San Juan region of Colorado, specimens of two uncommon bismuth minerals, lillianite and alaskaite, were collected. Lillianite was identified with ease by means of the tables of Davy and Farnham1 but alaskaite caused considerable difficulty and it was not until a specimen was obtained from the U. S. National Museum for comparison that it could be positively identified. On account of a cleavage which may be brought out by etching, the appearance of the mineral under the metallurgical microscope is very characteristic.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.