Minerals Quiz

Did you know?

• Obsidian, a black volcanic glass that had no time to crystallise, fractures with edges so fine it was used as a cutting tool as early as the Neolithic era.
• Opal, an amorphous form of silica containing water, owes its shifting iridescence to billions of tiny silica spheres stacked in regular patterns.
• Quartz, made of silicon dioxide, is the most abundant mineral in the Earth's continental crust.
• Discovered by Pierre and Jacques Curie, quartz's piezoelectricity works both ways: compressed, it generates electricity; fed a current, it oscillates at an ultra-precise frequency.

This quiz currently has 41 questions, ranging from easy to hard, available in French and English.