File:Vesicular basalt (16128028613).jpg
![File:Vesicular basalt (16128028613).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Vesicular_basalt_%2816128028613%29.jpg/667px-Vesicular_basalt_%2816128028613%29.jpg?20191010001540)
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Summary
[edit]DescriptionVesicular basalt (16128028613).jpg |
Vesicular basalt (3.1 cm across at its widest) Igneous rocks form by the cooling & crystallization of hot, molten rock (magma & lava). If this happens at or near the land surface, or on the seafloor, they are extrusive igneous rocks. If this happens deep underground, they are intrusive igneous rocks. Most igneous rocks have a crystalline texture, but some are clastic, vesicular, frothy, or glassy. Basalt is a common extrusive igneous rock. Basalt is the dominant rock in Earth’s upper oceanic crust. Black lava rocks seen at famous volcanoes such as Mt. Kilauea in Hawaii and Mt. Etna in Sicily are composed of basalt. Basalt has a mafic chemistry. Mafic igneous rocks are generally dark-colored, have 45-52% silica (= SiO2 chemistry) (mafic has also been defined as 45 to 55% silica), are rich in iron (Fe), magnesium (Mg), & calcium (Ca), and are dominated by the minerals plagioclase feldspar and pyroxene. Basalts have an aphanitic texture (finely crystalline; all or almost all crystals are <1 mm in size), but some are porphyritic or coarsely crystalline if the lava flow took time to cool & solidify (e.g., some Proterozoic basalt lavas in the Keweenaw Peninsula of Michigan's Upper Peninsula). Vesicular basalts (see above photo) are essentially intermediate lithologies between basalts and scorias. Scorias are basaltic rocks with numerous small gas bubbles. Vesicular basalts are basaltic rocks having relatively few, relatively large gas bubbles. Vesicular basalt is more dense than scoria (some scorias will float on water; vesicular basalts won’t do that). |
Date | |
Source | Vesicular basalt |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/16128028613 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 October 2019
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current | 00:15, 10 October 2019 | ![]() | 1,130 × 1,015 (2.15 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Pixel composition | RGB |
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Orientation | Normal |
Horizontal resolution | 800 dpi |
Vertical resolution | 800 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 19:43, 7 March 2015 |
Color space | Uncalibrated |
Image width | 1,130 px |
Image height | 1,015 px |
Date and time of digitizing | 14:39, 7 March 2015 |
Date metadata was last modified | 14:43, 7 March 2015 |