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Amethyst is a purple variety of quartz (SiO 2) and owes its violet color to irradiation, impurities of iron (Fe 3+) and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. [2] [3] [4] The irradiation causes the iron Fe 3+
A purple-pink star sapphire displaying asterism in a platinum ring. An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone. It can appear when a suitable stone is cut en cabochon (i.e. shaped and polished, not faceted).
The term porphyry is from the Ancient Greek πορφύρα (porphyra), meaning "purple". Purple was the colour of royalty, and the Roman "imperial porphyry" was a deep purple igneous rock with large crystals of plagioclase. Some authors claimed the rock was the hardest known in antiquity. [3]
Sugilite (/ ˈ s uː ɡ ə l aɪ t,-dʒ i-/ SOO-gə-lyte, -jee-) [2] [3] is a relatively rare pink to purple cyclosilicate mineral with the complex chemical formula K Na 2 (Fe, Mn, Al) 2 Li 3 Si 12 O 30. Sugilite crystallizes in the hexagonal system with prismatic crystals. The crystals are rarely found and the form is usually massive.
The different oxidation states occur due to there being a temperature gradient across the crystal during its formation. Artificial ametrine is grown with the hydrothermal method using solutions doped with specific elements, followed by irradiation of the created crystals. [2] Ametrine in the low price segment may stem from synthetic material.
Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [3] [4] It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [7]
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Stichtite is a mineral, a carbonate of chromium and magnesium; formula Mg 6 Cr 2 C O 3 (OH) 16 ·4H 2 O.Its colour ranges from pink through lilac to a rich purple colour. It is formed as an alteration product of chromite-containing serpentine.
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