Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. rock (inorganic material)
8. sedimentary rock
9. [sedimentary rock by composition]
10. carbonate rock
11. limestone
12. [limestone by composition]
13. [limestone by composition: aggregate type]
14. magnesian limestone

Narrower term/s

• Queenston limestone
• Angera stone
• Kasota stone

Anotations

Scope note:

A type of limestone having calcium carbonate content approaching 45%; employed as a flux in melting iron, as a lining for basic steel furnaces, for the production of magnesium metal, for filtering, and as a construction stone.