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  2. Biogenic silica - Wikipedia

    en.wikipedia.org/wiki/Biogenic_silica

    Biogenic silica (bSi), also referred to as opal, biogenic opal, or amorphous opaline silica, forms one of the most widespread biogenic minerals. For example, microscopic particles of silica called phytoliths can be found in grasses and other plants. Silica is an amorphous metalloid oxide formed by complex inorganic polymerization processes.

  3. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    The black fire opal is the official gemstone of Nevada. Most of the precious opal is partial wood replacement. The precious opal is hosted and found in situ within a subsurface horizon or zone of bentonite, which is considered a "lode" deposit. Opals which have weathered out of the in situ deposits are alluvial and considered placer deposits.

  4. Halley's Comet Opal - Wikipedia

    en.wikipedia.org/wiki/Halley's_Comet_Opal

    The Halley's Comet Opal is a very fine specimen, with few flaws or blemishes and a large green and orange 1.6 cm (0.63 in) thick color bar which goes through the opal. Formed about 20 million years ago, it is an example of a nobby, which is a natural lump-shaped opal found only at Lightning Ridge. [2] As of 2006 it was for sale at $1.2 million. [3]

  5. World's most expensive opal literally glows in the dark - AOL

    www.aol.com/news/2015-08-13-world-s-most...

    In fact, as it gets darker around the opal, the opal appears ever more vibrant. The stone's vivid and sparkly nature is in stark contrast to Coober Pedy, Australia where it was discovered.

  6. Category:Opals - Wikipedia

    en.wikipedia.org/wiki/Category:Opals

    Pages in category "Opals" The following 11 pages are in this category, out of 11 total. This list may not reflect recent changes. ...

  7. Rio de Los Angeles State Park - Wikipedia

    en.wikipedia.org/wiki/Rio_de_Los_Angeles_State_Park

    Rio de Los Angeles State Park is a California State Park along the Los Angeles River north of downtown Los Angeles in the neighborhood of Glassell Park, Los Angeles. The 247-acre (1.00 km 2 ) park includes restored wetlands featuring native plants as well as sports fields, a children’s playground and a recreation building. [ 1 ]

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