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Multicolored rough opal specimen from Virgin Valley, Nevada, US. The Virgin Valley [40] 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.
The Rough Fire was a major wildfire in Fresno County, California, and the largest of the 2015 California wildfire season.The fire was ignited by a lightning strike on July 31 and burned 151,623 acres (61,360 ha), largely in the Sierra National Forest and the Sequoia National Forest, before it was declared contained on November 6, 2015.
"Feature: Legendary sapphire for sale". United Press International; Sivaramakrishnan, P (January 4, 2016). "World's largest blue star sapphire 'found in Sri Lanka' ". BBC News; Smithsonian Institution (2019). "Bismarck Sapphire Necklace". Smithsonian Institution
Each of the three notable types of opal – precious, common, and fire [3] – display different optical effects; therefore, the intended meaning varies depending on context. The general definition of opalescence is a milky iridescence displayed by an opal, which describes the visual effect of precious opal very well, and opalescence is ...
[14] [15] At the time, the Thomas Fire was California's largest modern wildfire, which has since been surpassed by the Mendocino Complex's Ranch Fire in 2018. The December 2017 fires forced over 230,000 people to evacuate, with the 6 largest fires burning over 307,900 acres (1,246 km 2) and more than 1,300 structures. [16] [17]
Fire agate, a variety of chalcedony, is a semi-precious natural gemstone discovered so far only in certain areas of central and northern Mexico and the southwestern United States (New Mexico, Arizona and California). [1] Approximately 24-36 million years ago these areas were subjected to massive volcanic activity during the Tertiary Period.