Silica

What colour is silica?

It has high percentage of silica and alumina.

There has been an increase in the mining of silica sand in the American state of Illinois.

Mt. Thielsen, namesake for the surrounding Wilderness Area, is called “The Lightning Rod of the Cascades.” A dormant volcano, its peak is struck by lightning so often that some rocks at the summit have melted into an unusual mineral called fulgurite. This mineral is made of natural hollow glass tubes formed when silica is subjected to high temperatures, such as lightning strikes.

Nasa's aerogels are made from a special silica glass gel that's been mixed to the consistency of pudding.

Its Blair County property was sited at the foot of ganister-covered Dunnings Mountain to compete with the Mount Union plants making silica bricks for the steel industry.