obsidian is smooth but not basalt
Basalt and gabbro are both igneous rocks that form from the cooling and solidification of magma. Basalt is fine-grained and forms from lava flows on the Earth's surface, while gabbro is coarse-grained and forms from magma that cools beneath the surface. Obsidian is a volcanic glass that forms when lava with a high silica content cools rapidly, without time for crystal growth, resulting in a smooth, glassy texture.
== == Rhyolite, basalt, pumice, obsidian, andesite, dacite, tuff, welded tuff, scoria.
i think obsidian is a supercooled liquid of a magma.Its look like a glassy matter because is crystallised very faster than basalt and granite. Granite cools very slowly that's why it shows coarser grains and it crystallizes at very depth whereas basalt crystallizes at surface that's why it shows medium grain size.
The black volcanic rock with small crystals is most likely basalt. Basalt is fine-grained and is commonly found in volcanic regions as a result of solidified lava flows. The small crystals are often composed of minerals such as plagioclase and pyroxene.
Granite has large mineral grains compared to obsidian, basalt, and pumice. Granite is an intrusive igneous rock that forms deep within the Earth's crust, allowing for the growth of large mineral crystals due to slow cooling. Obsidian, basalt, and pumice are extrusive igneous rocks that cool quickly at the Earth's surface, resulting in smaller mineral grains or a glassy texture.
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
No. Pahoehoe forms basalt.
Obsidian
Obsidian, basalt, andesite, pumice.
What do you mean? Do you mean intrusive or extrusive or the types of rocks themselves? Fine. Here's a list Basalt Granite Pumice Obsidian
Basalt and gabbro are both igneous rocks that form from the cooling and solidification of magma. Basalt is fine-grained and forms from lava flows on the Earth's surface, while gabbro is coarse-grained and forms from magma that cools beneath the surface. Obsidian is a volcanic glass that forms when lava with a high silica content cools rapidly, without time for crystal growth, resulting in a smooth, glassy texture.
Obsidian is a volcanic glass formed from rapidly cooling lava, while basalt is a fine-grained, dark-colored igneous rock formed from the solidification of lava flows. Both rocks are commonly found in volcanic areas and have high silica content.
They are both Igneous. I hope this answered your question.!
A few varieties including basalt, obsidian, and scoria.
== == Rhyolite, basalt, pumice, obsidian, andesite, dacite, tuff, welded tuff, scoria.
Basalt and pumice.
Granite, Basalt, Gabbro, and Obsidian