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Granite sample
Granite sample
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Samples
Conceptually similar
Samples of intrusive igneous rocks
Rhyolite sample
Peridotite sample
Biotite sample
Gypsum sample
Hornfels sample
Potassium feldspar samples
Rip-up clast sample
Salt casts
Breccia
Brachiopod mold
Orthobreccia sample
Cross stratification
Permineralized plant fossil
Stromatolite
Diplocraterion trace fossil
Ophiomorpha
Rootlets
Graded bedding
Herringbone cross lamination
Granite sample
Granite is a hard, phaneritic, felsic, and intrusive igneous rock characterized by a holocrystalline texture of equigranular coarse mafic and felsic minerals creating a mosaic of white, gray, black, and pink grains. Its composition typically has amphiboles and micas, such as biotite, but is usually dominated by quartz and feldspars like this sample. Granites are sometimes referred to as a "salt and pepper" rock due to light-coloured felsic minerals, such as the pinkish potassium feldspar, milky white plagioclase, and vitreous quartz comprising the majority of this granite, while the dark mafics are dispersed and only comprise about 15-20% of the rock. Though these minerals are coarse and can be seen with the naked eye, a hand-lens can be used to further aid in identifying its entire composition. Its coarse, equigranular grains indicate a slow crystallization below the Earth's surface where the variety of minerals crystallized at the same rate. Though granites form beneath the surface, they are known to be very common and abundant in the continental crust with surface exposure due to uplift or erosion of overlying sedimentary cover. Granite is one of the most well-known igneous rocks due to its abundance, resistance to weathering, giving it multiple purposes in household design and aggregate uses.
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Creator
Dolphin, Glenn
Date
2018-09-06
Unique identifier
CU2STO15490
Location
Country
Canada
Province
Alberta
Municipality
City of Calgary
How can you use these images?
Permitted uses are outlined in License and Usage Rights. Usage Restrictions can only be waived by the copyright holder. Add to cart and make a request if you have any questions.
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In Copyright
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Conditions of Use
https://libanswers.ucalgary.ca/faq/199047
License URL
https://creativecommons.org/licenses/by/4.0
License
CC BY 4.0
Attribution
Attribution
Granite sample, 2018-09-06, (CU2STO15490) by Dolphin, Glenn. Courtesy of Geoscience Images Collection, Libraries and Cultural Resources Digital Collections, University of Calgary.