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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).
Apa (Hungarian: Apa, Hungarian pronunciation: ) is a commune of 2,575 inhabitants situated in Satu Mare County, Romania. It is composed of three villages : Apa ...
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 ]
The Alchymist, in Search of the Philosopher's Stone by Joseph Wright of Derby, 1771. The philosopher's stone [a] is a mythic alchemical substance capable of turning base metals such as mercury into gold or silver; [b] it was also known as "the tincture" and "the powder".
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.
The Dropa [1] stones are purported pseudoarcheological artifacts. They are claimed to be a series of 12,000-year old granite discs with inscribed markings that represent an account of an extraterrestrial crash landing on Earth.