sedimentary
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
Hardness: 6.5-7.0 (Mohs); Color: Teal, green, and blue with black, brown, and tan inclusions; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- Teal, green, and blue with black, brown, and tan inclusions
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Teal, green, and blue with black, brown, and tan inclusions; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Specific Gravity: 2.6-2.9
Formation & geological history
Technically a spotted Jasper found in Africa. It is a sedimentary rock formed by the deposition of silica and other minerals over long periods, often associated with volcanic ash or ancient seafloors.
Uses & applications
Primarily used in jewelry making for beads, cabochons, and decorative ornaments. It is also popular in holistic and metaphysical crystal collecting.
Geological facts
Despite its name, it is not actually Turquoise, but a variety of Jasper. It is often chemically treated or dyed to enhance its green-blue teal colors to resemble genuine turquoise.
Field identification & locations
Identify by its characteristic teal color base mixed with dark matrix spotting. It is much harder than real turquoise, so it will not scratch as easily. Found primarily in African mining regions.
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