A stalactite (UK /ˈstæləktaɪt/, US /stəˈlæktaɪt/; from the Greek stalasso, (σταλάσσω), "to drip", and meaning "that which drips") is a type of formation that hangs from the ceiling of caves, hot springs, or manmade structures such as bridges and mines. Any material which is soluble, can be deposited as a colloid, or is in suspension, or is capable of being melted, may form a stalactite. Stalactites may be composed of amberat, lava, minerals, mud, peat, pitch, sand, and sinter. A stalactite is not necessarily a speleothem, though speleothems are the most common form of stalactite because of the abundance of limestone caves.

The corresponding formation on the floor of the cave is known as a stalagmite.

Formation and type

Limestone stalactites

The most common stalactites are speleothems, which occur in limestone caves. They form through deposition of calcium carbonate and other minerals, which is precipitated from mineralized water solutions. Limestone is the chief form of calcium carbonate rock which is dissolved by water that contains carbon dioxide, forming a calcium bicarbonate solution in underground caverns. The chemical formula for this reaction is:

Stalactites is a solitaire card game which uses a deck of 52 playing cards. The game is similar to Freecell, but it is different because of the way building onto the foundations and the tableau.

Rules

The player deals four cards from the deck. These four cards form the foundations. They are turned sideways (although it is not necessary to do so).

The rest of the cards are dealt into eight columns of six cards each on the tableau. These cards can only be built up on the foundations regardless of suit and they cannot be built on each other.

Before the game starts, the player can decide on how the foundations should be built. Building can be either in ones (A-2-3-4-5-6-7-8-9-10-J-Q-K) or in twos (A-3-5-7-9-J-K-2-4-6-8-10-Q). Once the player makes up his mind, he begins building on the foundations from the cards on the tableau. The foundations are built, as already mentioned, up regardless of suit, and it goes round the corner, building from King to Ace (if building by ones) or from Queen to Ace (if building by twos) if necessary. The foundation cards turned sideways, though not necessarily be done, is a reminder of the last card's rank on each foundation.