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  2. Interference colour chart - Wikipedia

    en.wikipedia.org/wiki/Interference_colour_chart

    When using the chart, it is important to remember these tips: Isotropic and opaque (metallic) minerals cannot be identified this way. The stage of the microscope should be rotated until maximum colour is found, and therefore, the maximum birefringence. Each mineral, depending on the orientation, may not exhibit the maximum birefringence.

  3. Diopside - Wikipedia

    en.wikipedia.org/wiki/Diopside

    At 5.5–6.5 on the Mohs scale, chrome diopside is relatively soft to scratch. Due to the deep green color of the gem, they are sometimes referred to as Siberian emeralds, although they are on a gemological level completely unrelated, emerald being a precious stone and diopside being a semi-precious stone. [10]

  4. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    Sapphire (gem corundum of any color except red, especially blue varieties) Sard (a variety of chalcedony/quartz) Satinspar (a variety of gypsum) Selenite (a variety of gypsum) Simetite (a variety of amber) Smoky quartz (a brown or black variety of quartz) Soda niter (synonym of nitratine) Spectrolite (a variety of labradorite) Spessartite ...

  5. ColorChecker - Wikipedia

    en.wikipedia.org/wiki/ColorChecker

    The chart’s color patches have spectral reflectances intended to mimic those of natural objects such as human skin, foliage, and flowers, to have consistent color appearance under a variety of lighting conditions, especially as detected by typical color photographic film, and to be stable over time. In 2006, Gretag-Macbeth was acquired by X ...

  6. Standard illuminant - Wikipedia

    en.wikipedia.org/wiki/Standard_illuminant

    The same discrepancy applies to all illuminants in the D series—D 50, D 55, D 65, D 75 —and can be "rectified" by multiplying the nominal color temperature by ; for example … = for D 65. To determine the D-series SPD (S D ) that corresponds to those coordinates, the coefficients M 1 and M 2 of the characteristic vectors S 1 and S 2 are ...

  7. Color chart - Wikipedia

    en.wikipedia.org/wiki/Color_chart

    Color chips or color samples from a plastic pellet manufacturer that enables customers to evaluate the color range as molded objects to see final effects. A color chart or color reference card is a flat, physical object that has many different color samples present. They can be available as a single-page chart, or in the form of swatchbooks or ...

  8. Today's Wordle Hint, Answer for #1248 on Monday, November 18 ...

    www.aol.com/todays-wordle-hint-answer-1248...

    3 indulgent chocolate mousse recipes to match Pantone's color of the year. Food. The Today Show. 40 New Year's Eve drinks worthy of celebration. Lighter Side. Lighter Side. Associated Press.

  9. Optical mineralogy - Wikipedia

    en.wikipedia.org/wiki/Optical_mineralogy

    By taking the average, or the highest color given by any mineral, the relative value of its double refraction can be estimated, or if the thickness of the section be precisely known the difference between the two refractive indexes can be ascertained. If the slides are thick the colors will be on the whole higher than on thin slides.

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