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  2. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    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+

  3. Asterism (gemology) - Wikipedia

    en.wikipedia.org/wiki/Asterism_(gemology)

    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).

  4. Porphyry (geology) - Wikipedia

    en.wikipedia.org/wiki/Porphyry_(geology)

    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]

  5. Sugilite - Wikipedia

    en.wikipedia.org/wiki/Sugilite

    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.

  6. Ametrine - Wikipedia

    en.wikipedia.org/wiki/Ametrine

    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.

  7. Corundum - Wikipedia

    en.wikipedia.org/wiki/Corundum

    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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  9. Stichtite - Wikipedia

    en.wikipedia.org/wiki/Stichtite

    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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