The Geology of Quartz
42:46
Earth's Oldest Sediments - The Isua Supracrustal Belt
36:46
Buy Low, Sell High - It's A Good Time To Be a Geologist
42:20
How To Determine If Quartz Veins Are VALUABLE And Rich In GOLD
24:49
Minerals with Willsey: Quartz
35:12
The Geology of Puddingstone
17:58
Understanding Metals
1:20:48
The Hit and Run Rockies - With Professor Basil Tikoff
1:08:24