Geology

Miarolitic cavities or pods refer to small, irregular cavities in intrusive or plutonic igneous rock, usually lined with well-formed or

The poikilitic texture is an igneous rock texture in which large mineral crystals engulf or completely enclose many smaller ones

While learning about igneous rocks, you often come across the terms ophitic and subophitic textures or fabrics. What do they

Pegmatites are intrusive or plutonic rocks with unusually large mineral crystals. Typical grains are > 1cm (0.4 inches). Some are

Gabbroic rocks or gabbroids are coarse-grained, dark-colored mafic rocks. A mafic rock is one rich in iron and magnesium. These

There are several basalt rock types and varieties you should know. However, before going to the time, not everyone knows

Both andesite and basalt are fine-grained, volcanic, or extrusive igneous rocks. Volcanic or extrusive rocks form on the Earth’s surface.

Gabbro is a dense, coarse-grained, dark-colored mafic rock. It is mostly a plutonic rock but can also be extrusive/subsurface. Mafic

Dolerite, diabase, or formally microgabbro, is a dark-colored, medium-grained subvolcanic rock equivalent to basalt or gabbro in composition. Subvolcanic or