from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A hydrated magnesium carbonate mineral with the chemical formula Mg5(CO3)4(OH)2.4H2O, used as a fire retardant.
from the GNU version of the Collaborative International Dictionary of English
- n. A hydrous carbonate of magnesia occurring in white, earthy, amorphous masses.
from The Century Dictionary and Cyclopedia
- n. A white native hydrous carbonate of magnesium, sometimes occurring in crystals, but more frequently amorphous, earthy, and chalklike.
Lechuguilla Cave is not only the deepest at 494m (1,604 feet) and longest at 193 km (121 miles), but contains the largest collection of hydromagnesite balloon-like formations, subaqueous helictite formations and calcite speleothems.