Lansfordite

Lansfordite is a hydrated magnesium carbonate mineral with composition: MgCO3ยท5H2O. 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.

References

This article is issued from Wikipedia - version of the Thursday, July 04, 2013. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.