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It was used in rings, hair pins, beads, bracelets, bangles, necklaces, and pendants, [26] many of which can be seen in the Yorkshire Museum. Jet rings tended to follow the styles of existing metal rings although there were exceptions. [32] Jet pendants were carved cameo style with Medusa head being a popular theme. [33]
The stone found in an old mine was called “belomorite” — because, as Fersman explains, “The White Sea shimmered with the colors of moonstone... or did the stone reflect the pale blue depths of the White Sea?..” — Geologists took several samples to the Peterhof lapidary factory , recommending it as a new jewelry stone. [3]
Mineralogically the occurrence is important because all three white mica phases are present in an equilibrium assemblage. [ 4 ] There are several theories regarding the formation of the chiastolite cross, however the most widely accepted theory, proposed by Frondel in 1934, suggests that there is a selective attachment of impurities at the ...
The three silicon atoms and the three aluminum atoms listed above closest to a given corner of the unit cell form a six-membered ring of tetrahedra, and the four in any face of the unit cell form a four-membered ring of tetrahedra. The six-membered rings can serve as channels in which ions can diffuse through the crystal. [11]
Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...
Oregon Sunstone is unique in that crystals can be quite large. The copper leads to variant color within some stones, where turning one stone will result in manifold hues: the more copper within the stone, the darker the complexion. [9] On August 4, 1987, the Oregon State Legislature designated Oregon Sunstone as its state gemstone by joint ...