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  2. 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]

  3. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    Color: Purple, violet, dark purple: Crystal habit: 6 sided prism ending in 6 sided pyramid (typical) Twinning: Dauphine law, Brazil law, and Japan law: Cleavage: None: Fracture: Conchoidal: Mohs scale hardness: 7 (lower in impure varieties) Luster: Vitreous/glassy: Streak: White: Diaphaneity: Transparent to translucent: Specific gravity: 2.65 ...

  4. Charoite - Wikipedia

    en.wikipedia.org/wiki/Charoite

    Properties. Charoite is translucent lavender to purple in color with a pearly luster. Charoite is strictly massive in nature, and fractures are conchoidal. It has an unusual swirling, fibrous appearance, sometimes chatoyant, and that, along with its intense color, can lead many to believe at first that it is synthetic or enhanced artificially.

  5. Tanzanite - Wikipedia

    en.wikipedia.org/wiki/Tanzanite

    As a result of this phenomenon, a multitude of colors have been observed in various specimens: shades of purple, violet, indigo, blue, cyan, green, yellow, orange, red and brown. After heating, tanzanite becomes dichroic. The dichroic colours range from violet through bluish-violet to indigo and violetish-blue to blue.

  6. Blue John (mineral) - Wikipedia

    en.wikipedia.org/wiki/Blue_John_(mineral)

    Blue John (also known as Derbyshire Spar) is a semi-precious mineral, a rare form of fluorite with bands of a purple-blue or yellowish colour. In the United Kingdom it is found only at Blue John Cavern and Treak Cliff Cavern at Castleton in Derbyshire.

  7. Born in the purple - Wikipedia

    en.wikipedia.org/wiki/Born_in_the_purple

    Traditionally, born in the purple [1] (sometimes "born to the purple") was a category of members of royal families born during the reign of their parent. This notion was later loosely expanded to include all children born of prominent or high-ranking parents. [2] The parents must be prominent at the time of the child's birth so that the child ...

  8. Philosopher's stone - Wikipedia

    en.wikipedia.org/wiki/Philosopher's_stone

    The philosopher's stone is created by the alchemical method known as The Magnum Opus or The Great Work. Often expressed as a series of color changes or chemical processes, the instructions for creating the philosopher's stone are varied. When expressed in colours, the work may pass through phases of nigredo, albedo, citrinitas, and rubedo.

  9. Pleochroism - Wikipedia

    en.wikipedia.org/wiki/Pleochroism

    Corundum (high): purple / orange; Hypersthene (strong): purple / orange; Spodumene (strong): purple / clear / pink; Tourmaline (strong): pale purple / purple; Putnisite: pale purple / bluish grey; Blue. Aquamarine (medium): clear / light blue, or light blue / dark blue; Alexandrite (strong): dark red-purple / orange / green

  10. Beryl - Wikipedia

    en.wikipedia.org/wiki/Beryl

    Beryl is a common mineral, and it is widely distributed in nature. It is found most commonly in granitic pegmatites, but also occurs in mica schists, such as those of the Ural Mountains, and in limestone in Colombia. [11] It is less common in ordinary granite and is only infrequently found in nepheline syenite.

  11. Sugilite - Wikipedia

    en.wikipedia.org/wiki/Sugilite

    Sugilite (/ ˈ s uː ɡ ə l aɪ t,-dʒ i-/ SOO-gə-lyte, -⁠jee-) 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.