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THE FRANKLIN MINING DISTRICT
There remain for consideration the minerals
found in the zinc ore deposits, by far the most valuable as well as the most
numerous association found in the district. They have been grouped for discussion
as follows:
| Primary minerals | |
| Minerals of the pegmatite contact zones | |
| Reaction and recrystallization products, or "skarn" | |
| Pneumatolytic products | |
| Minerals of the hydrothermal veins | |
| Minerals resulting from surface oxidation, hydration, and carbonatization | |
In the accompanying table [Web Ed. note: to be added] the minerals have been arranged in the above groups, the name of each mineral being accompanied by its chemical formula, the better to bring out the chemical nature of the groups. It is clearly recognized that the several groups merge more or less, as all stages of alteration are represented, and several of the minerals are found in more than one group.
This suggested classification in genetic groups is of course hypothetical, but it serves to simplify the description of the paragenesis. Most of the conclusions here presented are based primarily on the study of hand specimens, as no detailed or systematic study of the ores in place has been made by the author nor, as far as he is aware, by any other geologist or mineralogist of the many who have visited or who have written about these deposits.
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Website
© by Herb Yeates 1997-2001.
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This
page created: January 12, 2001 6:37 PM
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