Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO3. In its (rare) pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown. It streaks white, and its Mohs hardness varies between 3.5 and 4. Its specific gravity is between 3.5 and 3.7. It crystallizes in the trigonal system, and cleaves with rhombohedral carbonate cleavage in three directions.

A female black lemur (Eulemur macaco), looks at a camera in its enclosure at Bioparc Fuengirola in Fuengirola, near Malaga, southern Spain, February 8, 2017. (Photo by Jon Nazca/Reuters)

Police officers stand near a fishing boat, the Carolina Queen III, as it rests in shallow water just off Rockaway Beach, Thursday, February 25, 2016, in the Queens borough of New York. Authorities say a Coast Guard vessel overturned while assisting the fishing boat that ran aground in an inlet off New York City. (Photo by Frank Franklin II/AP Photo)

Fireworks illuminate the Ampera Bridge during a New Year's Eve celebrations in Palembang, Indonesia on January 1, 2020. (Photo by Muhammad Tohir/Sijori Images via ZUMA Wire/Rex Features/Shutterstoc)

Former Vice President Joe Biden, 2020 Democratic presidential candidate, right, watches as his wife Jill Biden, center, blocks a protester from arriving on stage during an primary night rally in the Baldwin Hills neighborhood of Los Angeles, California, U.S., on Tuesday, March 3, 2020. The biggest day of the presidential primary calendar will define the nomination fight for Bernie Sanders and Biden and determine whether Michael Bloomberg and Elizabeth Warren have a rationale for carrying on their campaigns. (Photo by Patrick T. Fallon/Bloomberg via Getty Images)

Adult film actress/director Joanna Angel and her husband, adult film actor Small Hands, attend the 2018 Adult Video News Awards at the Hard Rock Hotel & Casino on January 27, 2018 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Members of the contemporary circus company Cirk La Putyka perform in front of sculpture of Franz Kafka's head to entertain local residents in Prague, Czech Republic, 21 April 2020. The aim of the Cirk La Putyka events in the streets of Czech capital is to get live art back to people during the lockdown. According to them, when people can't go to the artists, to the theater, the actors go to the people. The Czech government has imposed a lockdown in an attempt to slow down the spread of the pandemic COVID-19 disease caused by the SARS-CoV-2 coronavirus. (Photo by Martin Divisek/EPA/EFE/Rex Features/Shutterstock)

Undated image released Monday February 17, 2020, by Irish Coast Guard showing the abandoned cargo ship MV Alta, that has washed up on the coast of County Cork, near Ballycotton, southern Ireland. The MV Alta is believed to have had 10 crew members aboard who were rescued by the US Coast Guard. Since September 2018, the ship has been drifting with no crew aboard, and it was last seen off the coast of West Africa before being washed up in southern Ireland during Storm Dennis. (Photo by Irish Coast Guard via AP Photo)