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  2. Chrysoberyl - Wikipedia

    en.wikipedia.org/wiki/Chrysoberyl

    An alexandrite cat's eye is a chrysoberyl cat's eye that changes color. "Milk and honey" is a term commonly used to describe the color of the best cat's eyes. The effect refers to the sharp milky ray of white light normally crossing the cabochon as a center line along its length and overlying the honey-colored background.

  3. Chatoyancy - Wikipedia

    en.wikipedia.org/wiki/Chatoyancy

    Chatoyancy is caused by either the presence of fibrous structures within the material, such as in tiger's eye quartz, or by fibrous inclusions and cavities, as seen in cat's eye chrysoberyl. In cat's eye chrysoberyl, the chatoyant effect is caused by the presence of rutile, composed mostly of titanium dioxide, which aligns perpendicularly to ...

  4. Synthetic alexandrite - Wikipedia

    en.wikipedia.org/wiki/Synthetic_alexandrite

    Their inclusions of undissolved flux can look like inclusions in natural chrysoberyl. However, layers of dust-like particles parallel to the seed plate, and strong banding or growth lines may also be apparent. [a] The Inamori synthetic alexandrite had a cat's eye variety, which showed a distinct color change. The eye was broad and of moderate ...

  5. Moonstone (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Moonstone_(gemstone)

    Polished moonstones often display chatoyancy ("cat's eye" effect), where a luminous streak appears through the stone. Asterism is rare and produces four-legged stars. [1]

  6. Cat's eye - Wikipedia

    en.wikipedia.org/wiki/Cat's_eye

    Cat eye glasses, a style of horn-rimmed glasses designed for women; Cat's eye (toy), a kind of toy marble; Cat's Eye (cocktail), a gin-based cocktail; Cat's eye (road), a type of road marker using retroreflectors; Cat eye tube, an electron tube used as a visual indicator

  7. List of refractive indices - Wikipedia

    en.wikipedia.org/wiki/List_of_refractive_indices

    Some representative refractive indices; Name of material λ (nm) Refractive index no. n Reference Vacuum: 1 (by definition) Air at STP: 1.000273 [citation needed]Gases at 0 °C and 1 atm

  8. Peridot - Wikipedia

    en.wikipedia.org/wiki/Peridot

    Peridot (/ ˈ p ɛ r ɪ ˌ d ɒ t,-ˌ d oʊ / PERR-ih-dot, -⁠⁠doh), sometimes called chrysolite, is a yellow-green transparent variety of olivine.Peridot is one of the few gemstones that occur in only one color.

  9. Beryl - Wikipedia

    en.wikipedia.org/wiki/Beryl

    Beryl (/ ˈ b ɛr əl / BERR-əl) is a mineral composed of beryllium aluminium silicate with the chemical formula Be 3 Al 2 Si 6 O 18. [6] Well-known varieties of beryl include emerald and aquamarine.