Where is Granite found?
Granite
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Open the appGranite occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Granite
Sierra Nevada Batholith, USA
A vast batholith composed primarily of granite and granodiorite, forming the core of the Sierra Nevada mountain range in California.
Stone Mountain, Georgia, USA
A large monadnock composed of quartz monzonite, often commercially referred to as granite.
Cornwall, England
Known for its extensive granite intrusions, forming significant parts of the landscape and historically important for tin mining.
Himalayan Range, Asia
Large granite bodies are found within the Himalayan orogenic belt, formed during the collision of the Indian and Eurasian plates.
Fjords of Norway
Many of the dramatic landscapes in Norway are carved into ancient Precambrian granites and gneisses.
Collecting tips
- Look for Mountainous Regions. Granite is a fundamental component of continental crust and is often exposed in areas that have undergone significant uplift and erosion, such as mountain ranges and ancient shield areas.
- Examine Road Cuts and Quarries. These artificial exposures often provide excellent, fresh surfaces of granite, allowing for clear observation of its texture and mineralogy.
- Identify Coarse-Grained Texture. Granite's phaneritic texture is a key identifier. Look for individual mineral grains (quartz, feldspar, mica) that are visible to the naked eye and interlock.
- Observe Mineral Composition. Identify the characteristic minerals: glassy, irregular quartz; blocky, often pink or white feldspar; and flaky, dark (biotite) or silvery (muscovite) mica.
- Check for Light Coloration. While granite can vary, it is generally a light-colored rock due to its high content of felsic minerals (quartz and feldspar).
Quick Check
- Color:
- Light-colored (white, pink, red, gray), speckled
- Luster:
- Vitreous to pearly
- Streak:
- White (due to quartz and feldspar, micas may leave a faint streak)
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