The manganese carbonate mineral, Rhodochrosite, is a minor ore of manganese used mainly as a decorative stone and gemstone. Typically displaying shiny rose-red, intricately banded surfaces, it forms granular to compact cleavable masses, crusts, or columns. Hardness is 3.5 to 4, streak is white, and specific gravity is 3.7. Rhodochrosite occurs in moderate- to low-temperature hydrothermal ore veins, particularly of silver, lead, zinc, and copper, as well as in high-temperature metamorphic deposits.