 Isolated crystals of galena and ehalybite are not uncommon, although, as mentioned previously, these are usually concentrated in the center of the vein. Pyrites Is rare, and in contrast with the Derbyshire and Kentucky deposits there is an entire absence...  Bulletin - Page 1571927Full view - About this book
 | United States. Bureau of Mines - 1919 - 1164 pages
...Isolated crystals of galena and ehalybite are not uncommon, although, as mentioned previously, these are usually concentrated in the center of the vein....abundant and in most of the veins is quite a rarity. While most of the veins can be depended on to carry fluorspar steadily for long distances (in some... | |
 | United States. Bureau of Mines - 1919 - 1184 pages
...Isolated crystals of galena and chalybite are not uncommon, although, as mentioned previously, these are usually concentrated in the center of the vein....abundant and in most of the veins Is quite a rarity. While most of the veins can be depended on to carry fluorspar steadily for long distances (In some... | |
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