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Optically, a crystal ball is a ball lens. For typical materials such as quartz and glass, it forms an image of distant objects slightly beyond the surface of the sphere, on the opposite side. Unlike conventional lenses, the image-forming properties are omnidirectional (independent of the direction being imaged) This omnidirectional focusing can ...
In 1673, English glass merchant George Ravenscroft created a clear glass he called crystalline—but it was not stable. Three years later, he improved this glass by adding lead oxide, and lead glass (a.k.a. crystal) was created. [55] Ravenscroft, who had lived for many years in Venice, made lead crystal that was less breakable than cristallo. [56]
The crystal skull at the British Museum, similar in dimensions to the more detailed Mitchell-Hedges skull. Crystal skulls are human skull hardstone carvings made of clear or milky white quartz (also called "rock crystal"), claimed to be pre-Columbian Mesoamerican artifacts by their alleged finders; however, these claims have been refuted for all of the specimens made available for scientific ...
The original element of the work is a circular disc of clear quartz ("rock crystal"), measuring 11.5 centimetres (4.5 in) in diameter. This is engraved in intaglio with eight scenes depicting the story of Susanna and the Elders, related in the Book of Daniel (but regarded as part of the Apocrypha by Protestants). [2]
Durr Al Najaf (Arabic: دُر ٱلنَّجَف) is a glossy and clear gemstone from the quartz family. The name means "pearl of Najaf " as it can only be sourced from Wadi-al-Salaam (Arabic: وادي السلام, romanized: Wādī al-Salām, lit. 'Valley of Peace') in Najaf, Iraq. The gemstone is found along the west of Najaf close by the ...
Hardstone carving, in art history and archaeology, is the artistic carving of semi-precious stones (and sometimes gemstones ), such as jade, rock crystal (clear quartz ), agate, onyx, jasper, serpentinite, or carnelian, and for objects made in this way. [ 1][ 2] Normally the objects are small, and the category overlaps with both jewellery and ...
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