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Along with other gold-heavy quartz pieces, the gold was first believed to be bits of damaged machinery. A number of days later, the materials were examined and found to be full of gold. The “Crown Jewel” was the largest of the pieces, weighing in at 60 lb troy (22.4 kg). [4] The finding of the gold was reported by The National Enquirer. [5]
Natural electrum "wires" on quartz, historic specimen from the old Smuggler-Union Mine, Telluride, Colorado, USA The Pactolus river, from which Lydia obtained electrum for its early coinage Electrum Phoenician bowl with mythological scenes, a sphinx frieze and the representation of a king vanquishing his enemies, Cypro-Archaic I, from Idalion, 8th–7th centuries BC (Louvre, Paris) Brooch ...
A large gold nugget from Nevada County, California, on display at the National Museum of Natural History in Washington, D.C. Nuggets are gold fragments weathered out of an original lode. [1] They often show signs of abrasive polishing by stream action, and sometimes still contain inclusions of quartz or other lode matrix material.
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Tiger's eye (also called tiger eye) is a chatoyant gemstone that is usually a metamorphic rock with a golden to red-brown colour and a silky lustre.As members of the quartz group, tiger's eye and the related blue-coloured mineral hawk's eye gain their silky, lustrous appearance from the parallel intergrowth of quartz crystals and altered amphibole fibres that have mostly turned into limonite.
A substantial proportion of the gold is "invisible gold" incorporated into the pyrite (see Carlin-type gold deposit). It has been suggested that the presence of both gold and arsenic is a case of coupled substitution but as of 1997 the chemical state of the gold remained controversial. [15]
Goldstone Goldstone glass under magnification. Goldstone is a type of glittering glass made in a low-oxygen reducing atmosphere.The finished product can take a smooth polish and be carved into beads, figurines, or other artifacts suitable for semiprecious stone, and in fact goldstone is often mistaken for or misrepresented as a natural material.
Geochemical studies on gold bearing quartz-carbonate veins are important to determine temperature, pressure, at which the veins were generated, and the chemical signature of fluids. Quartz is generally the dominant mineral in the veins, but there are also gold bearing carbonate dominant veins in orogenic deposits. [ 15 ]
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