The mineral pyrite, or iron pyrite, also known as fool's gold, is an iron sulfide with the formula FeS2. This mineral's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal.
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals.

Tsukimi Ayano steps out of her house in the village of Nagoro on Shikoku Island in southern Japan February 24, 2015. Tsukimi Ayano made her first scarecrow 13 years ago to frighten off birds pecking at seeds in her garden. The life-sized straw doll resembled her father, so she made more. Today, the tiny village of Nagoro in southern Japan is teeming with Ayano's hand-sewn creations, frozen in time for a tableau that captures the motions of everyday life. (Photo by Thomas Peter/Reuters)

Armless professional photographer Rusidah, 44, takes a photograph as she carries out camera maintenance on March 13, 2012 in Purworejo, Indonesia. Rusidah shoots weddings and parties and has a small studio at home in the village of Botorejo, Bayan District, Purworejo, Central Java where her husband and son also reside. She has been in the photography business for nearly 20 years. (Photo by Ulet Ifansasti/Getty Images)

Dema and Manis, the 26-day-old endangered Sumatran Tiger cubs play together at the “Taman Safari Indonesia” Animal Hospital, on February 26, 2007 in Cisarua, Bogor Regency, West Java, Indonesia. The two Sumatran tiger-cubs recently born at the hospital have been rejected by their mother Cicis, while baby Orangutans, Irma and Nia have also been rejected by their mothers. All babies are being looked after by staff at the Animal Hospital. (Photo by: Dimas Ardian/Getty Images)

A group of women take photos of a giant donut installation outside the Maddox Gallery in Mayfair, London on Thursday June 24, 2021, to celebrate a new exhibition entitled Villainy, a body of work by an anonymous street artist from New York who operates under the alias, “Jerkface”. (Photo by Yui Mok/PA Wire Press Association)

A young child reaches out to a Gentoo penguin as it swims in its enclosure at Pairi Daiza Park in Cambron-Casteau, Belgium, Monday, July 5, 2021. Pairi Daiza, one of the biggest zoos in Europe, has recently added ten Gentoo penguins to their animal population. (Photo by Virginia Mayo/AP Photo)

Emma Raducanu of Great Britain takes a selfie after victory over Stephanie Voegele of Switzerland in the first round of the women's singles of the US Open at the USTA Billie Jean King National Tennis Center on August 31, 2021 in New York City. (Photo by Rex Features/Shutterstock)

A woman poses for a photo in the tourist area surrounding Houhai Lake during Chinese National Day holidays in Beijing, China, October 2, 2020. China is celebrating its national day marking the 71st anniversary of the People's Republic of China and the Mid-autumn Festival for a week beginning on October 1st. (Photo by Thomas Peter/Reuters)