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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]
In 1985 there was also a find of Romano-British jewellery and raw materials buried in a clay pot in AD 155, the Snettisham Jeweller's Hoard.Though it has no direct connection with the nearby Iron Age finds, it may be evidence of a long tradition of gold- and silver-working in the area.
The first set of commonly used mineral symbols was published in 1983 and covered the common rock-forming minerals using 192 two- or three-lettered symbols. [1] These type of symbols are referred to as Kretz symbols. More extensive lists were subsequently made available in the form of publications [2] [3] or posted on journal webpages. [4]
There are three basic techniques that may be used to attach granules to a metal surface: hard soldering, fusing and colloidal soldering. The metals used in granulation are usually gold and/or silver alloys of high purity – alloys below 18 kt. gold and sterling silver being unsuitable. With each technique, the process begins with the making of ...
The Stirling torcs [2] make up a hoard of four gold Iron Age torcs, a type of necklace, all of which date to between 300 and 100 BC and which were buried deliberately at some point in antiquity. They were found by a metal detectorist in a field near Blair Drummond , Perthshire , Scotland on 28 September 2009.
A widely used temperature-compensated cut of quartz is the AT-cut. Careful control of temperature and stress is essential in the operation of the QCM. AT-cut crystals are singularly rotated Y-axis cuts in which the top and bottom half of the crystal move in opposite directions (thickness shear vibration) [33] [34] during oscillation. The AT-cut ...
At least some of the iron artifacts were made of meteoric iron. [2] [3] The gold pieces include eleven bowls, three bottles and 28 bracelets. The iron pieces are the oldest found in the Iberian Peninsula and correspond to a stage in which iron was considered to be a precious metal, and so was hoarded.
Nuggets are usually 20.5 to 22 karat (k) purity, meaning they are 83% to 92% gold by mass. Gold nuggets in Australia are often 23 k or slightly higher, while Alaskan nuggets are usually at the lower end of the spectrum. Purity can be roughly assessed by nugget color: the richer and deeper the orange-yellow, the higher the gold content.
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