Open spaces in epithermal veins of the Bohemia mining district, Oregon, USA, filled with sediments during hydrothermal activity. These sediments consist mainly of chalcedony, rock fragments, and vein quartz fragments. In addition, hematite is deposited during stage three of the vein development. Observed sedimentary features include draping laminae, erosion surfaces, slumping, and graded beddin...

In several examples of subduction zones, we compared pairs quartz veins formed either at the lower temperatures seismogenic zone (260°C or below), higher its downdip limit (∼330°C). All analyzed here are mode I cracks that contemporaneously with host-rock main stage deformation peak burial conditions. Lower-temperature show crystals euhedral shapes and growth rims, while higher-temperature cont...

COLOURLESS, purple, and pink topaz and transparent quartz crystals have been found in calcite veins (with or without milky quartz) in calcareous rocks near Katlang (34 ~ 24' N, 72 ~ 6' E), Mardan district. The veins do not contain any fluorite nor the country rocks any topaz. The topaz and transparent quartz crystals are mostly broken and perfectly euhedral outlines are very rare. Refractive in...

The present study indicate that the copper mineralization in the area is of the nature of scattered sporadic occurrences of narrow lenticular and impersistent stringers and veins of copper-ore in vein-quartz and pegmatite traversing the amphibolite and garnetiferous mica schist country rock. The old workings for copper ore at Garimanipenta, which had a checkered history since early times, are b...

Synchysite was identified in the Rožná uranium deposit a quartz–carbonate–sulfide vein, which is part of late (post-uranium and, post-Variscan) stage development hydrothermal system. The synchysite forms needles or lamellae, are almost exclusively bound to quartz filling veins. structure vein-filling, i.e., preserved tubular syneresis crack pattern, Liesegang bands formed by hematite, chaotic g...

the muteh gold deposit (ne of golpaygan) in the central part of intrusive-metamorphic belt of sanandaj-sirjan zone comprises nw-se trending gold-quartz vein occurred in metamorphic complex. gold mineralization is associated with quartz veins that formed during regional deformation across the mylonitic zones in metamorphic rocks of predominantly meta-volcanic, gneiss and schist. the sulfidation ...