trichroism

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trichroism
trichroism (ˈtraɪkrəʊɪz(ə)m) [f. as prec. + -ism. Cf. F. trichroïsme.] The property of being trichroic: spec. a. Cryst.: see prec.1847 Webster cites Dana. 1860 in Mayne Expos. Lex. 1865–8 Watts Dict. Chem. III. 670 Some biaxial crystals exhibit trichroïsm; thus certain Brazilian topazes of a yellowi... Oxford English Dictionary
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Grandidierite
While trichroism can usually help distinguish grandidierites from other gems, lazulites can occur with blue-green colors and show colorless/blue/dark blue wikipedia.org
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trichromatic
trichromatic, a. (traɪkrəʊˈmætɪk) [f. Gr. τρι- tri- + χρωµατικός chromatic; Gr. has τριχρώµατος.] Having, showing, or pertaining to three colours; trichroic: spec. a. Optics. Having or relating to the three fundamental colour-sensations (red, green, violet) of normal vision. b. Applied to lithograph... Oxford English Dictionary
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pleochroic
pleochroic, a. Cryst. (pliːəʊˈkrəʊɪk) [f. pleo-, pleio- + Gr. χρώς complexion, colour, -χρο-ος coloured + -ic: cf. dichroic.] Showing different colours when viewed in two or in three different directions (dichroic or trichroic), as certain double-refracting crystals. pleochroic halo, each of a serie... Oxford English Dictionary
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Tanzanite
Tanzanite is noted for its remarkably strong trichroism, appearing alternately blue, violet and burgundy depending on crystal orientation. wikipedia.org
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Segnitite
Dichroism and trichroism are both types of pleochroism. wikipedia.org
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