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Malachite: a green mineral that is a basic carbonate of copper used especially for making ornamental objects
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Turquoise: a mineral that is a blue, bluish-green, or greenish-gray hydrous basic phosphate of copper and aluminum, takes a high polish, and is valued as a gem when sky blue
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Lapis Lazuli: a semiprecious stone that is usually rich azure blue and is essentially a complex silicate often with spangles of pyrites —called also lapis |
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Pink Opal: a usually amorphous mineral that is a hydrated silica softer and less dense than quartz and typically with definite and often marked iridescent play of colors and is used especially as a gem |
Amethyst: a clear purple or bluish-violet variety of crystallized quartz that is often used as a jeweler's stone. A deep purple variety of corundum |
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