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Ternary diagram showing the relative abundance of quartz, feldspar, and lithic grains and views of what selected compositions would look like. A QFL diagram or QFL triangle is a type of ternary diagram that shows compositional data from sandstones and modern sands, point counted using the Gazzi-Dickinson method. The abbreviations used are as ...
This page provides a comprehensive list of U.S. state minerals, rocks, stones, and gemstones.
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
Spruce Pine district is one of the largest suppliers of high-purity quartz, which is used in the manufacture of silicon for integrated circuits. [2] The district is named after the town of Spruce Pine , which is located in the middle of the region and is the hub of major mining activity there.
Aberdeen Quarry, an abandoned granite quarry in Gunnison County, Colorado. Its granite was used in construction of the Colorado State Capitol; Marble, Colorado, only site of Yule Marble quarrying, in the West Elk Mountains. 99.5% pure calcite, discovered in 1873, source of marble for the Tomb of the Unknowns and for the exterior of the Lincoln ...
Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, [1] [2] categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires. Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.