Wikipedia There is more information available on this subject at Marble on the English Wikipedia.
Marble is a non-foliated metamorphic rock resulting from the metamorphism of limestone,

Average structure of marble, calciumcarbonate

composed mostly of calcite (a crystalline form of calcium carbonate, CaCO3). It is extensively used for sculpture, as a building material, and in many other applications.

The UNSC uses marble as a building material, for example: the Côte d'Azur Museum of Natural History is constructed mainly of marble.[1] The UNSC also uses marble for various other decorative purposes. When using it as a building material, it is one of the more expensive materials. Iron and steel are two of the lesser expensive materials.

The Covenant also use marble as a decorative material, such as the black marble used to make the San'Shyuum cleric's pestle and mortar.[2] Marble is known for it's hardness, durability, and glossy properties.


  1. Halo: The Fall of Reach, page 184
  2. Halo: Contact Harvest, page 143