this list includes those recognised minerals beginning with the letters u and v.the international mineralogical association is the international group that recognises new minerals and new mineral names, however minerals discovered before 1959 did not go through the official naming procedure, although some minerals published previously have been either confirmed or discredited since that date.
orthoquartzite is a very pure quartz sandstone composed of usually well-rounded quartz grains cemented by silica. orthoquartzite is often 99% sio 2 with only very minor amounts of iron oxide and trace resistant minerals such as zircon, rutile and magnetite. although few fossils are normally present,.
ametrine, also known as trystine or by its trade name as bolivianite, is a naturally occurring variety of quartz. it is a mixture of amethyst and citrine with zones of purple and yellow or orange. almost all commercially available ametrine is mined in bolivia. the colour of the zones visible within ametrine are due to differing oxidation states of iron within the crystal. the citrine segments have oxidized iron while the amethyst segments are unoxidized. the different oxidation states occur due
prasiolite also known as green quartz, green amethyst or vermarine is a green variety of quartz, a silicate mineral chemically silicon dioxide. since 1950, almost all natural prasiolite has come from a small brazilian mine, but it is has also been mined in lower silesia in poland .
gemstone industry in greenland jump to . tugtupite, lapis lazuli, amazonite, peridot, quartz, spinel, topaz, and tourmaline. . the company's formal filing of a draft exploitation mining licence was submitted in june 2011 and was accepted in june 2013. company and government public hearings were held in august 2013.
the admiralty mining district is a mining area in the u.s. state of alaska which consists of admiralty island.most of the gold recovered from the admiralty district is a by-product of silver and base metal mining.. the alaska empire underground lode mine recovered gold from quartz veins in metamorphic rocks. discovered and staked in the 1920s, production of about 20,000 tonnes of 0.25 ounce .
amethyst is a purple variety of quartz sio 2 and owes its violet color to irradiation, impurities of iron and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. the hardness of the mineral is the same as quartz,.
pegmatite containing lepidolite, tourmaline, and quartz from the white elephant mine in the black hills, south dakota a pegmatite is an igneous rock , formed underground, with interlocking crystals usually larger than 2.5 cm in size 1 in .
gold-bearing quartz veins, blue ribbon mine, alaska in geology , a lode is a deposit of metalliferous ore that fills or is embedded in a fissure or crack in a rock formation or a vein of ore that is deposited or embedded between layers of rock. 1
the coromandel gold rushes on the coromandel peninsula and around the nearby towns of thames and waihi in new zealand in the nineteenth century were moderately successful. traces of gold were found about 1842. a small find was made near coromandel in 1852; and a larger find in august 1867 when there was a modest rush. but thames acquired a reputation for speculative holding of unworked ground .
prasiolite, also known as vermarine, is a variety of quartz that is green in color. since 1950, almost all natural prasiolite has come from a small brazilian mine, but it is also seen in lower silesia in poland. naturally occurring prasiolite is also found in the thunder bay area of canada. it is a rare mineral in nature; most green quartz is heat-treated amethyst.
the first mine shaft was named after a captain paul. the mine was in operation until 1865, eventually measuring 40 metres deep and 200 feet wide. the main mining centred on silver and lead, though connemara marble, gold, dolerite, quartz, and rare green and blue octahedral fluorite. exhibitions and tour