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Chalcedony - SiO2


Mineral profile




Attributes: Chalcedony is a microcrystalline variety of quartz, characterized by its fine texture and a waxy luster. It comes in a diverse range of colors and patterns.


Grades: Highly valued for its versatility and aesthetic appeal, chalcedony is frequently used in jewelry, carvings, and ornamental items. Its wide array of colors makes it a popular choice for gemstone enthusiasts.


Colors: Varies widely, including shades of blue, pink, purple, white, gray, and brown. Chalcedony can also exhibit distinctive banding, agate-like patterns, or translucency. Luster: Ranges from waxy to vitreous, contributing to its smooth and sometimes glossy appearance.


Rarity: Common, with chalcedony deposits found globally. However, certain varieties with specific colors or patterns may be more sought after by collectors.


Country of Origin: Found in various locations worldwide, major sources include Brazil, India, Madagascar, Mexico, and the United States (particularly in Oregon and California).


Here are some regions where chalcedony can be found in Australia:

  1. Queensland: Queensland is known for its diverse geological formations, and chalcedony can be found in several areas within the state. Chalcedony occurs in sedimentary rocks, and some locations in Queensland, particularly around the gemfields in the central part of the state, have been known to yield beautiful specimens.

  2. New South Wales: Chalcedony can be found in various parts of New South Wales. The Lightning Ridge area is known for black opal, which often occurs in association with chalcedony. Additionally, chalcedony deposits have been reported in other regions of the state.

  3. Victoria: In Victoria, chalcedony occurrences have been noted in various geological settings. The state's diverse geology provides opportunities for the formation of chalcedony in different rock types.

  4. South Australia: South Australia is another region where chalcedony can be found. The Flinders Ranges, known for its unique geological features, is one area where chalcedony has been reported.

  5. Western Australia: Western Australia, with its vast and varied landscapes, also hosts chalcedony deposits. Certain areas within the state may yield specimens of chalcedony, and it can be found in association with other minerals.

  6. Northern Territory: Some regions in the Northern Territory may contain chalcedony deposits. Geological formations in this area provide conditions conducive to the formation of chalcedony.


It's important to note that chalcedony can occur in a variety of colors, including white, gray, blue, pink, and more. The specific locations where chalcedony can be found may vary, and the mineral is often discovered in association with other minerals and within specific geological contexts.

Rock and mineral enthusiasts, lapidary artists, and collectors interested in chalcedony in Australia should be aware of any local regulations and obtain necessary permissions before conducting fieldwork or collecting specimens.


Formation: Forms in a variety of geological environments, including sedimentary rocks, volcanic rocks, and as a secondary mineral in hydrothermal deposits.


Hardness: Maintains a hardness of 6.5 to 7 on the Mohs scale, ensuring durability suitable for various jewelry and lapidary applications.


Chemical Composition: Primarily composed of silica (SiO2) with traces of other minerals and elements contributing to its diverse color palette.


Crystal System: Hexagonal, displaying microcrystalline structures without well-defined crystals.


History: Chalcedony has a rich history and has been used for ornamental and practical purposes since ancient times. It was highly prized by civilizations for its perceived protective and calming qualities.


Health Information: Generally safe to handle, but, as with any lapidary material, precautions should be taken during cutting and polishing to avoid inhaling dust. Intended Healing: Associated with various chakras depending on its color, chalcedony is believed to promote calmness, communication, and emotional balance. It is also thought to have nurturing and protective qualities. As with any metaphysical beliefs, individual interpretation and discretion are advised.


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