Wiktionary
lansfordite
n. (context mineralogy English) A soft monoclinic hydrated magnesium carbonate mineral.
Wikipedia
Lansfordite
Lansfordite is a hydrated magnesium carbonate mineral with composition: MgCO·5HO. Landsfordite was discovered in 1888 in a coal mine in Lansford, Pennsylvania. It crystallizes in the monoclinic system and typically occurs as colorless to white prismatic crystals and stalactitic masses. It is a soft mineral, Mohs hardness of 2.5, with a low specific gravity of 1.7. It is transparent to translucent with refractive indices of 1.46 to 1.52.