* Minerals: Alkaline-earth metals are typically found in minerals combined with other elements. For example:
* Calcium: Found in limestone (calcium carbonate), gypsum (calcium sulfate), and fluorite (calcium fluoride).
* Magnesium: Found in dolomite (calcium magnesium carbonate) and magnesite (magnesium carbonate).
* Barium: Found in barite (barium sulfate).
* Strontium: Found in strontianite (strontium carbonate).
* Radium: Found in trace amounts alongside uranium in certain uranium ores.
* Seawater: Some alkaline-earth metals, like magnesium and calcium, are present in seawater.
* Living organisms: Calcium is essential for bones and teeth in animals, and cell walls in plants. Magnesium plays a role in chlorophyll in plants.
Important Note: Alkaline-earth metals are highly reactive and do not exist in their pure elemental form in nature. They are typically extracted from minerals through complex chemical processes.
