Watch the world's greatest cities rise and fall over the past 4,000 years. 1  These are the 25 most high-tech cities in the world. 2  Scientists have cracked Rome's secret to waterproof concrete. 3  These mega-projects will transform the world's greatest cities by 2030. 4  The inequality we're not talking about: house prices.
When it comes to makeup, color is the name of the game. Minerals provide the color to eyes, cheeks, lips, and nails. Iron oxide, one of the most important color minerals, was used by Cleopatra in the form of red ochre as rouge. Today, iron oxides give red, orange, yellow, brown, and black tones to makeup. Chrome oxides are used for greens; manganese violet for purple; ground lapis lazuli may be added to makeup for blue.
Also known as opalite and Tifanny stone, opal fluorite is a purple gemstone with swirls of lavender and white, earning the gemstone the nickname ice cream opal. This purple rock is composed predominantly of opalized stone, mixed with other minerals like quartz and chalcedony.hile most popular in red, garnet also occurs as purple stones. The purple crystals come from the varieties of garnet called pyrope and spessartine. Blue garnet, the rarest of all garnets, itself turns into a purple stone under an incandescent light.