#26

3D Model

Age: 2902 Ma

Geon: 29

Timescale (Eon/Era/Period): Archean/Mesoarchean

Rock type: Metamorphic (metasedimentary)

Rock name: Pyrite-bearing quartz pebble conglomerate

Major minerals: quartz, pyrite (+graphite)

Locality: Witswatersrand, South Africa

Comment: Gold-bearing pyrite; the Witswatersrand deposits have supplied approximately 50% of the world’s mined gold.

Rocks Through Geological Time Activity (EOSC220 Introductory Mineralogy, UBC)