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A Goa stone or Lapis de Goa was a man-made bezoar that was considered to have medicinal and talismanic properties. Goa stones were made in Goa, India and exported to apothecaries in Europe from the mid-16th to 18th century. [1] Goa stones were manufactured by Jesuits in the late seventeenth century in Goa because naturally occurring bezoars ...
Rhinestones are sized by using the term "ss," or stone size, following a number to indicate size (e.g. 8ss is equivalent to 2.3 mm diameter, 10ss is 2.8 mm). [3] Many of the commonly used rhinestone sizes are slightly smaller than currency. [4] SS is more commonly used for apparel means, while PP (or pearl plate) is used for jewelry. [5]
The stone is 4.8 metres high, 1.5 metres wide and 0.3 metres thick. [6] The largest sides of the stone are almost perfectly oriented to the north and south. [ 6 ] The monolith has the shape of a ship's rudder and probably weighs about seven tonnes.
[4] [5] Most gemstones are hard, but some softer minerals such as brazilianite may be used in jewelry [6] because of their color or luster or other physical properties that have aesthetic value. However, generally speaking, soft minerals are not typically used as gemstones by virtue of their brittleness and lack of durability.
[2] [4] Supposedly, in 1974 Austrian engineer Ernst Wegerer (or Wegener) visited the Banpo Museum in Xi'an, Shaanxi, where he saw two of the Dropa stones. [6] It is said that he inquired about the discs but received no information, although he was allowed to take one in his hand and photograph them up close. By 1994 the discs could no longer be ...
Lepidolite is a lilac-gray or rose-colored member of the mica group of minerals with chemical formula K(Li,Al) 3 (Al,Si,Rb) 4 O 10 (F,OH) 2. [2] [3] It is the most abundant lithium-bearing mineral [4] and is a secondary source of this metal. It is the major source of the alkali metal rubidium.
2–3 Al 3 (Al,Si) 2 Si 13 O 36 •12H 2 O. It forms as white, green to reddish tabular monoclinic tectosilicate crystals with a Mohs hardness of 3.5 to 4 and a specific gravity of 2.1 to 2.2. It commonly occurs as a devitrification product of volcanic glass shards in tuff and as vesicle fillings in basalts, andesites and rhyolites.
Damigeron (4th century) [4] wrote about its property to make rain, solar eclipse, and its special virtue in divination and preserving health and youth. A Christian tradition states that the red spots come from blood falling upon the stone during the crucifixion of Jesus, as he was stabbed in the side by a Roman soldier. [ 5 ]