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By contrast, the accumulation of opal is strongly influenced by dissolution in the water column.
The light sheet travels parallel to the cylinder axis, strikes a 3-10 cm length of the meniscus, and is reflected onto a plate of opal glass.
Opal is my friend, but she really isn't my friend.
Opal alerts us to another attitude.
Small quantities of amethyst, peridot, and black opal are also produced.
Contrarily, "opalescence" is correctly applied to the milky, turbid appearance of common or "potch" opal.
Wealthy women wore jewels such as emeralds, aquamarine, opal, and pearls as earrings, necklaces, rings and sometimes sewn onto their shoes and clothing.
Gems were also mined, including opal and emerald.
Mining is focused on non-metallic minerals with opals and kaolin the most important products.
The clock dials are set in an iron frame 23ft m in diameter, supporting 312 pieces of opal glass, rather like a stained-glass window.
The cap takes a high polish and acts as a protective layer for the opal.
Nonsense mutations that created this premature stop codon were later called "opal mutations" or "umber mutations".
Here opal is found as a kernel in small concretions.
The majority of silica cements are composed of quartz but can include, chert, opal, feldspars and zeolites.
Opal is another mineraloid because of its non-crystalline nature.