Calcium:

Calcium compounds are a common cause of water hardness.

Calcium is also a component of lime, gypsum, and limestone.

Terms Related to Calcium

• Calcium-treated mud

  A freshwater drilling mud using calcium oxide (lime) or calcium sulfate (gypsum) to retard the hydrating qualities of shale and clay formation, thus facilitating drilling. ...

• Calcium carbonate

  A chemical combination of calcium, carbon, and oxygen. It is the main constituent of limestone. It forms a tenacious scale in water-handling facilities and is ...

• Calcium contamination

  Dissolved calcium ions in sufficient concentration to impart undesirable properties, such as flocculation, reduction in yield of bentonite, and increased fluid loss, in a drilling ...

• Calcium sulfate

  A chemical compound of calcium, sulfur, and oxygen. Although sometimes considered a contaminant of drilling fluids, it may at times be added to them to ...

• Gypsum

  A naturally occurring crystalline form of calcium sulfate in which each molecule of calcium sulfate is combined with two molecules of water. See calcium sulfate.

• Calcium hydroxide

  The active ingredient of slaked (hydrated) lime, and the main constituent in cement (when wet). Referred to as "lime" in field terminology.

• Hard water

  Water that contains dissolved compounds of calcium, magnesium, or both. Compare soft water.