chalcedony
Noun
Meaning
A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax.
Source: Webster's dictionarySynonyms
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Landscape agate is chalcedony with a number of different mineral impurities making the stone resemble landscapes.
Many semi-precious gemstones are in fact forms of chalcedony.
The more notable varieties of chalcedony are as follows: Agate Agate Agate is a variety of chalcedony characterized by either transparency or color patterns, such as multi-colored curved or angular banding.
The color of chalcedony sold commercially is often enhanced by dyeing or heating.
This is thought to be because chalcedony is extremely finely grained (cryptocrystalline), and so has a very high surface area to volume ratio.