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January 18, 2015

Geology Word of the Week: J is for Jasper

def. Jasper: A dense, opaque variety of chalcedony. Jasper is most often red in color but can also be yellow, brown, green, or gray.   For this week’s Geology Word of the Week post, we’re going to learn a little about silica, aka silicon dioxide or SiO2. More specifically, we’re going to learn about silica minerals. Silicon and oxygen are the two most common elements in the Earth’s crust and are found in many, …

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