Quartz “Herkimer Diamond”

Quartz – SiO2
Elements: Silicon, Oxygen
Class: Silicates – Tectosilicates
Crystal System: Hexagonal
Hardness: 7
Quartz
Talc (1)Diamond (10)
Very hard. Scratches glass and steel.
Origin: Middleville, Herkimer ounty, New York – Usa History: Ex Kay Robertson Collection
Did you know?

Pressing a quartz crystal makes it give off a precise electric beat, which is why it keeps time in nearly every watch and once tuned the radios of World War II, when good crystals were a strategic resource.