The Naturalist in Nicaragua |
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Page 76
Mr . David Forbes , in his account of the geology of Peru and Bolivia , has
advanced the opinion that auriferous quartz veins belong to two different systems
, one occurring in connection with Granitic , the other with Diorytic intrusive rocks .
Mr . David Forbes , in his account of the geology of Peru and Bolivia , has
advanced the opinion that auriferous quartz veins belong to two different systems
, one occurring in connection with Granitic , the other with Diorytic intrusive rocks .
Page 77
Origin of Mineral Veins 77 plete gradation from veins of perfectly crystallised
granite , through others abounding in quartz at the expense of the other
constituents , up to veins filled with pure quartz , as at Porth Tust , near Cape
Cornwall ; and ...
Origin of Mineral Veins 77 plete gradation from veins of perfectly crystallised
granite , through others abounding in quartz at the expense of the other
constituents , up to veins filled with pure quartz , as at Porth Tust , near Cape
Cornwall ; and ...
Page 78
Quartz veins extend sometimes for miles , and it is necessary to suppose on the
hydro - thermal theory that the fissures remained open sufficiently long for the
gradual deposition of the veinstones , without the soft and shattered rocks at their
...
Quartz veins extend sometimes for miles , and it is necessary to suppose on the
hydro - thermal theory that the fissures remained open sufficiently long for the
gradual deposition of the veinstones , without the soft and shattered rocks at their
...
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The Naturalist in Nicaragua: A Narrative of a Residence at the Gold Mines of ... Thomas Belt No preview available - 2018 |
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