No, I am not talking about the formation of the lead atoms themselves but the age that they had crystallised and laid as Native metal in that deposit.
12.
It is found either as a native metal ( rare ) or in cinnabar ( HgS ), corderoite, livingstonite and other minerals, with cinnabar being the most common ore.
13.
Those most obvious to early man would have been gold, copper and iron; platinum and silver also occur as native metals, but much more rarely . ( p . 9)
14.
Over geological time scales, very few metals can resist natural weathering processes like oxidation, which is why generally only the less reactive metals such as gold and platinum are found as native metals.
15.
The energy that was used to electrolyze the potassium from a potassium salt ( since potassium is never found as the native metal on Earth ) may have come immediately from any of various sources.
16.
Unusual calcite ( CaCO 3 ) crystals, translucent carbon spherules, fragments of basaltic glass and native metals ( native iron and nickel ) are reported near the crater and associated with impact ejecta or hot water precipitates.
17.
A very high specific gravity becomes very pronounced in native metals; kamacite, an iron-nickel alloy common in iron meteorites has a specific gravity of 7.9, and gold has an observed specific gravity between 15 and 19.3.
18.
Lead ions can replace the native metal ions in several key enzymes, such as zinc cations in the ALAD enzyme, which is also known as porphobilinogen synthase, and is important in the synthesis of heme, a key component of the oxygen-carrying molecule hemoglobin.
19.
Moorey was unconvinced the artifact was indeed a vase, mentioning that Selimkhanov, after his analysis of the Tello object ( published in 1975 ), " attempted to relate the metal to Transcaucasian natural antimony " ( i . e . native metal ) and that " the antimony objects from Transcaucasia are all small personal ornaments . " This weakens the evidence for a lost art " of rendering antimony malleable ."
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