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Turquoise. Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6(PO 4)4(OH)8·4 H 2 O. It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
Howlite is commonly used to make decorative objects such as small carvings or jewelry components. Because of its porous texture, howlite can be easily dyed to imitate other minerals, especially turquoise because of the superficial similarity of the veining patterns. Howlite is also sold in its natural state, sometimes under the trade names of ...
Turquoise (/ ˈ t ɜːr k (w) ɔɪ z / TUR-k(w)oyz) is a cyan color, based on the mineral of the same name.The word turquoise dates to the 17th century and is derived from the French turquois, meaning 'Turkish', because the mineral was first brought to Europe through Turkey from mines in the historical Khorasan province of Iran (Persia) and Afghanistan today.
Larimar is the tradename for a rare blue variety of the silicate mineral pectolite found only in the Dominican Republic, around the city of Barahona. [4] Its coloration varies from bluish white, light-blue, light-green, green-blue, turquoise blue, turquoise green, turquoise blue-green, deep green, dark green, to deep blue, dark blue and purple, violet and indigo and the larimar can come in ...
This is a list of gemstones, organized by species and types. Minerals There ... Turquoise; Ulexite; Ussingite; Vanadinite; Variscite; Väyrynenite; Vesuvianite (idocrase)
The necklace now located in the Musée d'Histoire et d'Archéologie de Vannes. Callaïs is the generic name for ancient green-blue precious stones used for making pendants and beads by western European cultures of the later Neolithic and early Bronze Age. The term includes turquoise and variscite but not jade. [1][2][3] "Callaïs" was described ...
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