Silica Group of Silicate Minerals


Quartz was the mineral upon which the Stone Ages were based. With few exceptions, most early stone tools were fashioned of quartz. Outcrops of quartz that were suitable for tool manufacturing were targeted by some of the earliest known mining activities and the mined quartz was traded across vast distances, even before humans began to […]
Source link

Leave a Reply

Your email address will not be published. Required fields are marked *