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The Opificio delle pietre dure, literally meaning "Workshop of semi-precious stones", is a public institute of the Italian Ministry for Cultural Heritage based in Florence. It is a global leader in the field of art restoration and provides teaching as one of two Italian state conservation schools (the other being the Istituto Superiore per la ...
A rough specimen of bloodstone. Heliotropes (from Ancient Greek ἥλιος (hḗlios) 'sun' and τρέπειν (trépein) 'to turn') (also called ematille, Indian bloodstones, or simply bloodstones) are aggregate minerals, and cryptocrystalline mixture of quartz that occurs mostly as jasper or sometimes as chalcedony (translucent).
The Aqueduct of Segovia (Spanish: Acueducto de Segovia) is a Roman aqueduct in Segovia, Spain.It was built around the first century AD to channel water from springs in the mountains 17 kilometres (11 mi) away to the city's fountains, public baths and private houses, and was in use until 1973.
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 ]
Gurasada (Hungarian: Guraszáda, German: Zaadt) is a commune in Hunedoara County, Transylvania, Romania.It is composed of eleven villages: Boiu de Jos (Alsóboj), Boiu de Sus (Felsőboj), Cărmăzănești (Karmazinesd), Câmpuri de Sus (Kimpur), Câmpuri-Surduc (Kimpényszurduk), Dănulești (Danulesd), Gothatea (Gothátya), Gurasada, Runcșor (Runksor), Ulieș (Ullyes) and Vica (Vika).
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.
Msoura (also Mzoura, Mezora, Mçora, M'Zorah, M'Sora or Mzora) [1] is an archaeological site of a stone circle in northern Morocco.It is located near Chouahed village, 15 kilometers southeast of Asilah, and consists of 167 monoliths surrounding a tumulus 58 m long, 54 m wide, with a height of 6 m.
Pietra serena was very popular in Italian Renaissance architecture, and because of this the quarries where the stone was found were exploited.Numerous quarries surrounding the Florentine region of Italy have been found both under and above ground, and each quarry was distinct in the variety of pietra serena formed there due to the differing style of rock formation.