หินปูน

Also known as Kalkstein

Limestone is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate . Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with informa

AI overview

Limestone is a sedimentary rock made mostly of calcium carbonate minerals that forms when calcium precipitates out of water, often through the accumulation of sea creatures like corals and shells. It's the main source of lime and frequently contains fossils that help scientists understand Earth's past.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Rock.name: Limestone
Rock.type: Sedimentary
Rock.image: ElTorcal0408.jpg
Rock.caption: Limestone outcrop in the Torcal de Antequera nature reserve of Málaga, Spain
Rock.composition: Calcium carbonate: inorganic crystalline calcite or organic calcareous material

via Wikipedia infobox