8 



LARSEN AND STEIGER: MINERALOGIC NOTES 



largely of amethystine quartz containing galena, sphalerite, 

 and some streaks and bodies of the chlorite; it carries much 

 silver and some gold. The veins are in great flows of rhyolite, 



1. Middle Cambrian slate from British Columbia. 



2. Sericite from Diirrberg. Quoted by Dana, System of Mineralogy, 6th 

 edition, p. 618, analysis 41. 



3. Analysis of aphrosiderite from near Field, B. C. George Steiger, analyst. 

 3a. Analysis of aphrosiderite computed free from gangue. Sp. Gr. = 2.96. 

 3b. Molecular ratios of 3a. 



4. Analysis of aphrosiderite from Weilburg. Sp. Gr. = 2.8. Quoted by Dana, 

 System of Mineralogy, 6th edition, p. 660, analysis 1. 



5. Analysis of aphrosiderite from Bonscheerer. Sp. Gr. = 2.991. Quoted 

 by Dana, System of Mineralogy, 6th edition, p. 660, analysis 3. 



