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  2. Alexandrite effect - Wikipedia

    en.wikipedia.org/wiki/Alexandrite_effect

    The Alexandrite effect has also been observed in some other minerals, such as fluorite, sapphire, kyanite, monazite, spinel, garnet, tourmaline, and rare-earth oxalates. Not to be confused with the alexandrite effect, some minerals also exhibit pleochroism. The former is a response to different wavelengths of light in general, the latter an ...

  3. Chrysoberyl - Wikipedia

    en.wikipedia.org/wiki/Chrysoberyl

    Main chrysoberyl producing countries. The mineral or gemstone chrysoberyl is an aluminate of beryllium with the formula Be Al 2 O 4. [5] [6] The name chrysoberyl is derived from the Greek words χρυσός chrysos and βήρυλλος beryllos, meaning "a gold-white spar".

  4. Color theory - Wikipedia

    en.wikipedia.org/wiki/Color_theory

    Color theory, or more specifically traditional color theory, is a historical body of knowledge describing the behavior of colors, namely in color mixing, color contrast effects, color harmony, color schemes and color symbolism. [1] Modern color theory is generally referred to as color science.

  5. Tetrachromacy - Wikipedia

    en.wikipedia.org/wiki/Tetrachromacy

    The four pigments in a bird's cone cells (in this example, estrildid finches) extend the range of color vision into the ultraviolet. [1]Tetrachromacy (from Greek tetra, meaning "four" and chroma, meaning "color") is the condition of possessing four independent channels for conveying color information, or possessing four types of cone cell in the eye.

  6. Synthetic alexandrite - Wikipedia

    en.wikipedia.org/wiki/Synthetic_alexandrite

    Flux-grown alexandrite stones are expensive to make and are grown in platinum crucibles. Crystals of platinum may still be evident in the cut stones. Alexandrite grown by the flux-melt process will contain particles of flux, resembling liquid “feathers” with a refractive index and specific gravity that echo that of natural alexandrite. Some ...

  7. On Colors - Wikipedia

    en.wikipedia.org/wiki/On_Colors

    On Colors (Greek Περὶ χρωμάτων; Latin De Coloribus) is a treatise attributed to Aristotle [1] but sometimes ascribed to Theophrastus or Strato.The work outlines the theory that all colors (yellow, red, purple, blue, and green) are derived from mixtures of black and white.

  8. The ClueFinders 4th Grade Adventures: Puzzle of the Pyramid

    en.wikipedia.org/wiki/The_ClueFinders_4th_Grade...

    The game has 15 different activities, each with their own skill and goal and divided among five different topics. The first four activities cover Language Arts, followed by five Mathematics activities, two activities on Science, two on Social Studies and finally two on Problem Solving.

  9. Theory of Colours - Wikipedia

    en.wikipedia.org/wiki/Theory_of_Colours

    Light spectrum, from Theory of Colours – Goethe observed that colour arises at the edges, and the spectrum occurs where these coloured edges overlap.. Theory of Colours (German: Zur Farbenlehre) is a book by Johann Wolfgang von Goethe about the poet's views on the nature of colours and how they are perceived by humans.

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