| The mineral glaucophane, for example, has a pleochroism scheme of colourless, lavender, and sky blue. |
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| Biotite occurs as interstitial grains with strong pleochroism from light yellowish-green to dark brown. |
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| Optically, purple apatite commonly shows slight bluish to reddish pleochroism. |
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| With tourmaline's strong pleochroism, darker tourmalines are cut to display the lighter of the two pleochroic colors. |
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| Orthorhombic amphiboles exhibit less intense pleochroism than the monoclinic amphiboles. |
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| Ruby shows pleochroism which means that the color varies with the direction of viewing. |
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| By placing the crystal in front of your screen and turning it you contemplate the pleochroism of the crystal! |
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| Place the filter in front of your light source and rotate the crystal to the filter to observe the pleochroism! |
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| Cordierite is often referred to as dichorite because of its strong pleochroism, which produces gemstones that appear to change shades of color, depending on the viewing angle. |
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| Distinguishing Features: brittle, pleochroism. |
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| Distinguishing Features the crystal habit, color and pleochroism. |
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| The most priceless tanzanite is bright blue with violet pleochroism. |
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| When cutting many pleochroic gemstones, such as iolite and tanzanite, the trick is to minimize the pleochroism and to maximize the single best color. |
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| Iolite has a remarkable feature known as pleochroism, meaning the colour changes when viewed from different directions, usually dark blue-violet, pale-blue, grey or yellow. |
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| Two types of amphibole are present, an earlier generation of magnesio-hornblende with greenish brown-brown-tan pleochroism and later pale green-green actinolitic hornblende. |
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