Dissolved metals and salts (sodium, chloride, potassium, calcium, manganese, magnesium)

The Egerszalók spa pools contain water rich in calcium, magnesium, and hydrocarbonate minerals.

Comment: The calcium magnesium has totaly changed my life.

Clintonite is a calcium magnesium aluminium phyllosilicate mineral.

Arame is high in calcium, iodine, iron, magnesium, and vitamin A as well as being a dietary source of many other minerals.

Rabbittite (hydrated calcium magnesium uranyl carbonate hydroxide)

Swartzite (hydrated calcium magnesium uranyl carbonate)

These "live grains" have increased levels of calcium, iron, magnesium, and potassium, making them highly nutritious and easy to digest.

We call water "hard" if it contains a lot of calcium, magnesium or other minerals.

Interference from calcium, magnesium, or lithium, on the other hand, is weak enough that their presence in normal concentrations is also usually not a problem.