Basalt Granite And Obsidian Rock

Basalt is fine grained so the individual minerals are not visible but they include pyroxene plagioclase feldspar and olivine these minerals are visible in the coarse grained plutonic version of basalt called gabbro.

Basalt granite and obsidian rock. Igneous rocks that solidified within the crust are plutonic or intrusive rocks. Magma that has reached the surface is lava. Properties of rock is another aspect for basalt vs obsidian. Appearance of basalt is dull and soft and that of obsidian is shiny.

Basalt is available in black brown light to dark grey colors whereas obsidian is available in black blue brown green orange red tan yellow colors. Igneous rocks from left to right. Obsidian is volcanic glass meaning it has no crystals and consists primarily of silica with just enough impurities to color it whereas basalt is a low silica high iron magnesium igneous rock entirely made of small crystals of various minerals including plagioclase feldspar and usually pyroxene and or amphibole. Associate each rock name granite diorite gabbro rhyolite andesite basalt obsidian pumice scoria tuff and volcanic breccia from the classification chart with the geological setting numbers 1 12 shown on the following diagram.

Molten rock material below the surface is called magma. This specimen erupted from kilauea volcano in 1960. The principle minerals that make up dacite are plagioclase quartz pyroxene or hornblende. When obsidian breaks it fractures with a distinct conchoidal fracture.

Basalt is an extrusive or intrusive rock that makes up most of the world s oceanic crust. Basalt is a dark colored fine grained igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock such as a lava flow but can also form in small intrusive bodies such as an igneous dike or a thin sill it has a composition similar to gabbro the difference between basalt and gabbro is that basalt is a fine grained rock while. Obsidian is a very shiny natural volcanic glass.

Dacite is an extrusive igneous rock.