Search results
Results from the WOW.Com Content Network
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.
The richest deposit of native silver ever found in the British Isles Clogau: Gold Bontddu: Gwynedd: Midas Exploration: 1862–1998 Dolaucothi: Gold Pumsaint: Carmarthenshire: Unknown–1938 Parys Mountain
UK Coal was the United Kingdom's largest coal mining company, producing approximately 8.7 million tonnes of coal annually from deep mines and surface mines, and possessed estimated reserves in excess of 200 million tonnes of coal. [11] The firm was the successor of British Coal, which was privatised in 1997.
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.
In the 1970s, Opal Fruits were well known in the UK for their advertising tag line "Opal Fruits—made to make your mouth water!" (slogan coined by Murray Walker [21]). The full advertising jingle was "Opal Fruits—made to make your mouth water/Fresh with the tang of citrus/four refreshing fruit flavours/orange, lemon, strawberry, lime/Opal ...
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.
Menilite Menilite. Menilite is a greyish-brown form of the mineraloid opal. [1] It is also known as liver opal or leberopal (German), due to its color. It is called menilite because it was first described from Ménilmontant (), France, [1] where it occurs as concretions within bituminous Early Oligocene Menilite Shales.
Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America.It is commonly unearthed by natural erosion or through the process of various mining practices, within the perimeter of an ancient sea bed called the Western Interior Seaway. [2]