This is an indicator of the concentration of particular surface minerals across the continent. Many minerals were mapped by the ASTER mission (NASA & METI).

Types of mineral concentration maps from the ASTER mission include:

• Gypsum 
• Silica 
• Quartz
• Ferrous Iron
• Ferric Oxide 
• Kaolin Group
• AlOH Group 
• MgOH Group

Relevant data is available from:

• NCI THREDDS
• CSIRO