Add to ORKGSiO₂ - Mohs Hardness: 6 – 7. Chalcedony is a very important ornamental stone. The varieties Agate, Chrysoprase, Carnelian, Sard, Tiger\u27s Eye, Bloodstone, Jasper, and Moss Agate are all carved into cabochons and beads, making fine yet inexpensive gems. The apple-green variety, Chrysoprase, has a distinct color and commands a higher price than the other varieties. Light blue Chalcedony has also become popular as a gemstone.http://utdr.utoledo.edu/rock-mineral/1050/thumbnail.jp
As an extension to the typical 'scratch hardness' (e.g. Mohs scale) of minerals, at the end of the 1...
The authors present the history of chrysoprase discovery and the progress of knowledge about this ma...
Cu2CO3(OH)2 and Cu2H2Si2O5(OH)4 - Mohs Hardness: 3-4. Chrysocolla, a copper silicate, blends well...
WOS: 000435349500002There are chalcedony and amethyst formations in two fields in AydA +/- ncA +/- k...
Gems are well-compressed small pieces found in mineral deposits found inside earth. Pearls and amber...
The chalcedony formations observed in the village of Nebikoy and its surroundings in Tokat province ...
A low-crystallinity index chalcedony was found in the rhyolitic ignimbrite of the Late Jurassic Zhan...
SiO₂ - Mohs Hardness: 7. Fine amethysts are featured in the British Crown Jewels and they were also...
Gem-quality, apple-green, Ni-bearing chalcedonic quartz occurs as near-surface veins in silicified s...
ZnS and CaCO₃ - Mohs Hardness: 3½ - 4 and 3. Crystals of suitable size and transparency have been f...
ABSTRACT: Paleozoic sandstones of the Parnaíba Basin, in addition to hosting opal deposits, also hav...
The study is devoted to the development of technology to enhance the aesthetic characteristics of de...
SrSO4 - Mohs Hardness: 3 - 3½. Celestine is an attractive mineral consisting of stronitum sulfate t...
International audienceThis possibly antique cameo (Figure 1) has banding originating from the specta...
MnSiO₃ - Mohs Hardness: 5½ - 6½. Rhodonite is a popular mineral among collectors. When it forms in ...
As an extension to the typical 'scratch hardness' (e.g. Mohs scale) of minerals, at the end of the 1...
The authors present the history of chrysoprase discovery and the progress of knowledge about this ma...
Cu2CO3(OH)2 and Cu2H2Si2O5(OH)4 - Mohs Hardness: 3-4. Chrysocolla, a copper silicate, blends well...
WOS: 000435349500002There are chalcedony and amethyst formations in two fields in AydA +/- ncA +/- k...
Gems are well-compressed small pieces found in mineral deposits found inside earth. Pearls and amber...
The chalcedony formations observed in the village of Nebikoy and its surroundings in Tokat province ...
A low-crystallinity index chalcedony was found in the rhyolitic ignimbrite of the Late Jurassic Zhan...
SiO₂ - Mohs Hardness: 7. Fine amethysts are featured in the British Crown Jewels and they were also...
Gem-quality, apple-green, Ni-bearing chalcedonic quartz occurs as near-surface veins in silicified s...
ZnS and CaCO₃ - Mohs Hardness: 3½ - 4 and 3. Crystals of suitable size and transparency have been f...
ABSTRACT: Paleozoic sandstones of the Parnaíba Basin, in addition to hosting opal deposits, also hav...
The study is devoted to the development of technology to enhance the aesthetic characteristics of de...
SrSO4 - Mohs Hardness: 3 - 3½. Celestine is an attractive mineral consisting of stronitum sulfate t...
International audienceThis possibly antique cameo (Figure 1) has banding originating from the specta...
MnSiO₃ - Mohs Hardness: 5½ - 6½. Rhodonite is a popular mineral among collectors. When it forms in ...
As an extension to the typical 'scratch hardness' (e.g. Mohs scale) of minerals, at the end of the 1...
The authors present the history of chrysoprase discovery and the progress of knowledge about this ma...
Cu2CO3(OH)2 and Cu2H2Si2O5(OH)4 - Mohs Hardness: 3-4. Chrysocolla, a copper silicate, blends well...