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The Virgin Valley [39] opal fields of Humboldt County in northern Nevada produce a wide variety of precious black, crystal, white, fire, and lemon opal. The black fire opal is the official gemstone of Nevada. Most of the precious opal is partial wood replacement.
Indeed, ammolite is often used as an imitation of black opal. An even less convincing possibility is Slocum stone, a common glass-based imitation of opal. Blues and purples are much more pervasive in labradorite, and in both it and opal the play of color is seen to roll across the stone unlike the comparatively restricted play of color in ammolite.
Whether a gemstone is a natural stone or synthetic, the chemical, physical, and optical characteristics are the same: They are composed of the same mineral and are colored by the same trace materials, have the same hardness and density and strength, and show the same color spectrum, refractive index, and birefringence (if any). Lab-created ...
Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal; Flame Queen Opal; Galaxy Opal; Halley's Comet Opal, the world's largest uncut black opal; Olympic Australis Opal, reported to be the largest and most valuable gem opal ever found
Eilat stone; Epidosite; Glimmerite; Goldstone (glittering glass) Hawk's eye; Helenite (artificial glass made from volcanic ash) Iddingsite; Kimberlite; Lamproite; Lapis lazuli; Libyan desert glass; Llanite; Maw sit sit; Moldavite; Obsidian; Apache tears; Pallasite; Peridotite (also known as olivinite) Siilinjärvi carbonatite; Soapstone (also ...
The Halley's Comet Opal is the largest uncut black opal in the world, according to the Guinness Book of World Records. It is so named because it was unearthed in 1986, a year when Halley's Comet could be seen from Earth. It is the third largest gem grade black opal ever recorded, the largest one extant, and the largest specimen ever found in ...
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