Voorbeelden van opal

• 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.