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 fog bow is a similar phenomenon to a rainbow; however, as its name suggests, it appears as a bow in fog rather than rain. Because of the very small size of water droplets that cause fog—smaller than 0.05 millimeters (0.0020 in)—the fog bow has only very weak colors, with a red outer edge and bluish inner edge.

The stunning shots capture the moment a female bear and her two cubs enjoyed the last warm rays of the sun at the Arctic National Wildlife Refuge in Kaktovik, Alaska. The bears can be seen gazing at the vibrant sunset and appear to revel in the tranquil moment as they bask in the array of colors. (Photo by Sylvain Cordier/Caters News)

A woman covers her face as men throw colored powder at her during “Lathmar Holi” at the village of Barsana in the northern Indian state of Uttar Pradesh March 9, 2014. (Photo by Anindito Mukherjee/Reuters)

For 130 years, the people of Masatepe have observed Good Friday by dressing up in colorful masks and costumes and dragging chained “Judases” through the streets of their town in western Nicaragua. Photo: A Judas is carried through the streets. The crowd pretends to kick and beat the Judases to show scorn. (Photo by Oswaldo Rivas/Reuters)

Zaria Forman is a Brooklyn-based artist who creates life-like works of art by using pastel colors to draw. The representations you see here are all created delicately by finger. Photo: “Greenland #63” 50x75, soft pastel on paper. (Photo by Zaria Forman)

Tourist Michel Watson found this pink dolphin making a splash in Brazil. The unusual creature, which hides deep in the Rio Negro river, was spotted leaping out of the Amazonian water brandishing its bizarre bright bubblegum color. Weighing in at nearly 300 pounds, the curious animal, known as an Amazon Pink River Dolphin, looked unusually agile as it rose above the waves. (Photo by Michel Watson)

Looking at the photos taken by Aaron Groenom, very easy to get lost in this starry wonderland. A series of photos Dark Places - a collection of works in which the artist from South Dakota contrasts the beauty of the universe to various natural or man-made forms on Earth. Using long exposures, it captures the magical landscape filled with fabulous atmosphere, striking color palettes and far-distant galaxies.