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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.
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.
Pages in category "Opals" The following 11 pages are in this category, out of 11 total. This list may not reflect recent changes. ...
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.
The park, under the name Placerita Canyon Natural Area, is currently managed by the Los Angeles County Department of Parks and Recreation. [2] The Placerita Canyon Nature Center is the park's visitor center and museum. The park also contains the Walker Cabin (a restored and furnished 1920s cabin of the Walker family), and hiking and nature trails.
The Eaton Fire started on Jan. 7 and quickly exploded in Los Angeles County, destroying nearly 10,000 structures and killing 17 people. The fire was 99% contained as of Friday, according to the ...
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The park comprises 605 acres (245 ha), and is located near the geographical center of the city of Los Angeles. [1] Franklin Canyon is also the name of the canyon and surrounding neighborhood. The park features a 3-acre (1.2 ha) lake, a duck pond and over five miles (8 km) of hiking trails.