The term 'Stalagmite Makeup' refers to the composition of a stalagmite, which is a type of rock formation that grows from the floor of a cave due to the accumulation of minerals from dripping water. The mineral that makes up the majority of a stalagmite is calcite, which is a seven-letter word. Calcite is a carbonate mineral composed of calcium and carbon, and it is the primary mineral found in limestone and marble.