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Phenakite or phenacite is a fairly rare nesosilicate mineral consisting of beryllium orthosilicate, Be 2 Si O 4.Occasionally used as a gemstone, phenakite occurs as isolated crystals, which are rhombohedral with parallel-faced hemihedrism, and are either lenticular or prismatic in habit: the lenticular habit is determined by the development of faces of several obtuse rhombohedra and the ...
Sapphire (gem corundum of any color except red, especially blue varieties) Sard (a variety of chalcedony/quartz) Satinspar (a variety of gypsum) Selenite (a variety of gypsum) Simetite (a variety of amber) Smoky quartz (a brown or black variety of quartz) Soda niter (synonym of nitratine) Spectrolite (a variety of labradorite) Spessartite ...
The World of Warcraft Trading Card Game (WoW TCG) is an out-of-print collectible card game based on Blizzard Entertainment's MMORPG, World of Warcraft. The game was announced by Upper Deck Entertainment on August 18, 2005 and released on October 25, 2006. [ 1 ]
Epiasterism, such as that seen in sapphire and most other gems, is the result of a reflection of light on parallel arranged inclusions inside the gemstone. Diasterism, such as that seen in rose quartz, is the result of light transmitted through the stone. In order to see this effect, the stone must be illuminated from behind.
Refractive index readings of faceted gems can range around α = 1.651, β = 1.668, and γ = 1.689, with a biaxial positive birefringence of 0.037–0.038. With decreasing magnesium and increasing iron concentration, the specific gravity, color darkness and refractive indices increase, and the β index shifts toward the γ index.
Aquamarine crystals grow over long periods, which enables them to take on their distinctive hexagonal prismatic shape. [9] This is a very long process that can take millions of years to form. The settings in which aquamarine forms can vary and may lead to variations in gem quality, size, and color. [9]
The mineral is also referred to as lavulite, luvulite, and royal azel by gem and mineral collectors. [3] In Japan, sugilite is found as yellowish-white to colourless, and is not good for jewellery. [6] Sugilite on Matrix, Wessels Mine in Northern Cape Province, South Africa, size: 2.4 × 2.1 × 1.2 cm Sugilite owl and mouse, height 9 cm (3.5 in)
World of Warcraft Cosmic Map, showing Azeroth (bottom right corner) and Outland (top left corner) In a change from the previous Warcraft games produced by Blizzard, World of Warcraft is a massively multiplayer online role-playing game (MMORPG) where thousands of players can interact with each other. Despite this change, the game draws many ...