from The Century Dictionary.
- noun A white native hydrous carbonate of magnesium, sometimes occurring in crystals, but more frequently amorphous, earthy, and chalklike.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) A hydrous carbonate of magnesia occurring in white, earthy, amorphous masses.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
hydrated magnesium carbonate mineralwith the chemical formulaMg5(CO3)4(OH)2.4H2O, used as a fire retardant.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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.