What element is it that gives amethyst its violet color?

What element is it that gives amethyst its violet color?

Amethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiation, iron impurities (in some cases in conjunction with transition element impurities), and the presence of trace elements, which result in complex crystal lattice substitutions.

How many times has the host country won the World Cup?

In the 19 FIFA World Cups so far, six host countries have been crowned champions: Uruguay (1930), Italy (1934), England (1966), Germany FR (1974), Argentina (1978) and France (1998), much to the delight of their home fans.

Which explorer discovered the Hawaiian Islands?

On January 18, 1778, the English explorer Captain James Cook becomes the first European to discover the Hawaiian Islands when he sails past the island of Oahu.

How many women have won the Nobel Prize?

The Nobel Prize and Prize in Economic Sciences have been awarded to women 47 times between 1901 and 2014. Only one woman, Marie Curie, has been honoured twice, with the 1903 Nobel Prize in Physics and the 1911 Nobel Prize in Chemistry.

Who invented the little black dress?

Fashion historians ascribe the origins of the little black dress to the 1920s designs of Coco Chanel and Jean Patou intended to be long-lasting, versatile, affordable, accessible to the widest market possible and in a neutral colour. Its ubiquity is such that it is often simply referred to as the “LBD”.

How fast does a rocket have to travel to escape the Earth’s gravity?

If you want to completely escape Earth’s gravity and travel to another moon or planet, though, you need to be going even faster – at a speed of at least 7 miles per second or about 25,000 miles per hour.

What reasons does the Constitution give for impeaching a president?

The President, Vice President and all civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors.

Why do some chickens lay green eggs?

A hen with a white earlobe will always lay white eggs, whereas hens with red earlobes can lay brown, blue or green eggs. Araucana and Ameraucana breeds, also known as the “Easter Egg Chickens”, famously lay varying shades of green and blue eggs.