2 articles
Calthemite
Calthemite: secondary calcium carbonate deposits (stalactites, straws, flowstone) growing from concrete, mortar, or lime structures outside caves; term coined by Garry K. Smith (2016); hyperalkaline pH >9, CO2 absorbed, growth up to 2 mm/day.
Moonmilk
Moonmilk is a white, pasty-when-wet cave deposit of very fine carbonate crystals (calcite, hydromagnesite, huntite, gypsum) formed from dripwater with possible microbial help, historically mined in Alpine caves as a medicine.