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Gold is a chemical element; it has the symbol Au (from the Latin word " aurum ") and the atomic number 79. In its pure form, it is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal, a group 11 element, and one of the noble metals.
The term "Goldback" refers to each unit of the currency and is 1/1000 of an ounce of pure gold. [citation needed] The Goldbacks are issued in "denominations" of 1, 5, 10, 25, and 50, each containing proportionally larger amounts of gold. [2] [3] [4] The notes are minted by Valaurum, a private mint. Valaurum uses a vacuum deposition process to ...
The fineness of a precious metal object (coin, bar, jewelry, etc.) represents the weight of fine metal therein, in proportion to the total weight which includes alloying base metals and any impurities. Alloy metals are added to increase hardness and durability of coins and jewelry, alter colors, decrease the cost per weight, or avoid the cost ...
Gold nugget. A gold nugget is a naturally occurring piece of native gold. Watercourses often concentrate nuggets and finer gold in placers. Nuggets are recovered by placer mining, but they are also found in residual deposits where the gold-bearing veins or lodes are weathered. Nuggets are also found in the tailings piles of previous mining ...
Colloidal gold is a sol or colloidal suspension of nanoparticles of gold in a fluid, usually water. [1] The colloid is coloured usually either wine red (for spherical particles less than 100 nm) or blue-purple (for larger spherical particles or nanorods ). [2]
Talent (measurement) The talent ( Ancient Greek: τάλαντον, talanton, Latin talentum) was a unit of weight used in the ancient world, often used for weighing gold and silver, but also mentioned in connection with other metals, ivory, [1] and frankincense. In Homer 's poems, it is always used of gold and is thought to have been quite a ...
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Often inter-grown, massive, radiated, granular, globular, and stalactitic. The mineral pyrite ( / ˈpaɪraɪt / PY-ryte ), [6] or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Fe S 2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral. [7]
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