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November 14, 2023
def. Quartzite: A metamorphic rock that consists primarily of interlocking grains of the mineral quartz. Quartzite forms when quartz-rich sandstone undergoes metamorphism. The term “quartzite” is an example of a geologic term that can be a little confusing. Most of the time, geologists use the term “quartzite” to refer to a metamorphic rock, which is the definition that I have provided above. Sometimes, geologists also use the term “quartzite” …
March 21, 2016
This week’s “Monday Geology Picture” features a pretty pink rock lamp owned by some friends of mine. Many pink rock lamps are made out of salt crystals. However, this particular rock lamp is made out of a rose quartz crystal. The lamp is placed on top of a flat muscovite crystal.
January 18, 2015
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, …