Secrets About Mining Herkimer Diamond Quartz Crystals
Herkimer Diamond Geology and Geography. The host rock for Herkimer Diamonds is the Cambrianage, Little Falls Dolostone. The Little Falls Dolostone was deposited about 500 million years ago, and the Herkimer Diamonds formed in cavities within the cavities are frequently lined with drusy quartz crystals and are often coated with a tarry hydrocarbon.