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Although other minerals such as tourmaline, scapolite, corundum, spinel and quartz can form "cat's eye" stones similar in appearance to cymophane, the jewelry industry designates these stones as "quartz cat's eyes", or "ruby cat's eyes" and only chrysoberyl can be referred to as "cat's eye" with no other designation. [citation needed]
The stones will be very clean and may be available in large sizes. Gemological testing will reveal a refractive index of 1.759–1.778 ( corundum ) instead of 1.741–1.760 ( chrysoberyl ). Under magnification, gas bubbles and curved stria may be evident.
The word beryl – Middle English: beril – is borrowed, via Old French: beryl and Latin: beryllus, from Ancient Greek βήρυλλος bḗryllos, which referred to a 'precious blue-green color-of-sea-water stone'; [2] from Prakrit veruḷiya, veḷuriya 'beryl' [8] [a] which is ultimately of Dravidian origin, maybe from the name of Belur or ...
Peridots can be differentiated by size and composition. A peridot formed as a result of volcanic activity tends to contain higher concentrations of lithium, nickel and zinc than those found in meteorites. [8] [full citation needed] Olivine is an abundant mineral, but gem-quality peridot is rather rare due to its chemical instability on Earth's ...
The more common beryllium containing minerals include: bertrandite (Be 4 Si 2 O 7 (OH) 2), beryl (Al 2 Be 3 Si 6 O 18), chrysoberyl (Al 2 BeO 4) and phenakite (Be 2 SiO 4). Precious forms of beryl are aquamarine, red beryl and emerald. [18] [40] [41] The green color in gem-quality forms of beryl comes from varying amounts of chromium (about 2% ...
Gadolinite; Gahnite; Gahnospinel; Garnet group: Pyralspite. Almandine; Pyrope; Spessartine; Ugrandite. Andradite. Demantoid; Melanite; Topazolite; Grossular ...