Limestone is a carbonate sedimentary rock associated with aquatic environments. The archived note links its calcite and aragonite content to a relatively soft natural stone with a broad range of building and industrial uses.
- Main mineral forms
- Calcite and aragonite are identified as different crystal forms of calcium carbonate, written in the source as CaCO3.
- Formation
- Limestone forms when minerals precipitate from water containing dissolved calcium through biological or abiotic processes. The article says biological processes may have been more important over the past 540 million years.
- Hardness
- Calcareous stone is described as relatively soft, with limestone placed at 4 or 5 on the Mohs hardness scale.
- Selection effect
- Mineral composition affects appearance, use, care, maintenance and processing, so materials that share minerals can show related behavior without being identical products.
Dimension stone and building uses
The archive names building façades, floor tile, roofing particles, wallboard, concrete, cement and sculpture material. It also refers to limestone powder and size stone. The correct form and finish depend on the product, not on the rock name alone.
Industrial and agricultural uses
Paper, glass, paint, plastic, medicine, cosmetics, toothpaste, soil conditioner, animal-feed filler and coal-mine safety dust are among the applications listed. The page shows the breadth of calcium-carbonate use; it does not state that quarry-grade block stone can enter every application without processing and specification control.
