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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).
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 ]
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.
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.
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 ...
The Pierre de Laitre, at 624 metres (2,047 ft) above sea level, is easily accessible after a climb of 150 metres (490 ft) from the Grandrupt forest road in the Kemberg massif. There is a gazebo on top of the stone with a protective barrier from which there is a good view over the valley and the village of Taintrux.
Pietrasanta is a town and comune on the coast of northern Tuscany in Italy, in the province of Lucca.Pietrasanta is part of Versilia, on the last foothills of the Apuan Alps, about 32 kilometres (20 mi) north of Pisa.