Wad

For other uses, see WAD (disambiguation).

Wad is an old mining term for any black manganese oxide or hydroxide mineral rich rock in the oxidized zone of various ore deposits. Typically closely associated with various iron oxides. Specific mineral varieties include pyrolusite, lithiophorite, nsutite, takanelite and vernadite.

References

• Mindat

External links

 Chisholm, Hugh, ed (1911). "Wad". Encyclopædia Britannica (11th ed.). Cambridge University Press.