Chalcedony - knowledge base, jewelry
Properties of chalcedony, physiological effects, zodiac signs and chalcedony jewelry.
Chemical and physical properties of chalcedony:
Formula: SiO2 silicon dioxide
Crystal system: trigonal
Category: quartz- chalcedony
Color: bluish, greyish white
Transparency: low translucent
Mohs scale hardeness: 6,5 – 7,0
Specific gravity: 2,58 – 2,64 g/cm³
Major metaphysical healing properties attributed to chalcedony:
Anti- inflammatory, aids hormone production, metabolism, lowers blood pressure, supports immune system, edema, diabetes, brain function, respiratory system, mucous membranes, eyes, lactation, improves communication.
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Chalcedony is made up of tiny fibres running in parallel
Chalcedony variants differ in colour and pattern. It is essentially a microcrystalline version of quartz. Chalcedony is formed in silica-rich cavities, deposits. The physical properties of chalcedony depend on the conditions under which it crystallises, and its density and hardness are slightly lower than those of quartz. It is probably named after an ancient city. Its structure is porous and therefore easy to stain.
Use of chalcedony
Mostly used to make necklaces and rings. Chalcedony is a popular material among gemstone engravers. It is used to make convex facets for jewellery and ornaments.
Different versions of chalcedony are known:
- Moss agate
Occurence of chalcedony
Sri Lanka, India, Madagascar, Brazil, Namibia, Uruguay, Zimbabwe, USA, China, Egypt, Scotland.