Calcium Bicarbonate transformed into Calcium Carbonate
Stalagmites: Projective Magic
Stalactites: Receptive Magic
Stalactite and Stalagmite: mineral forms often found in caves; sometimes
collectively called dripstone. A stalactite is an icicle-shaped mass of calcite
attached to the roof of a limestone cavern. A stalagmite is a cone of calcite
rising from the floor of a cavern.
Stalagmites and stalactites are often found in pairs, the stalagmite being
formed as a result of further evaporation and precipitation from solution
after the trickle of water falls from the stalactite.
Stalactites and stalagmites often meet each other to form solid pillars.
http://www.encyclopedia.com/html/s1/stalacti.asp
http://www.factmonster.com/ce6/sci/A0846450.html
Calcium Carbonate
CaCo3, or calcium carbonate in the form of calcite,
is the main constituent of calcareous corals...
See CORAL: Gemstones and Crystals for Magick and Healing
http://www.wicca.com/celtic/stones/stonea-e.htm