What You Shouldn’t Miss on Diabase or Dolerite Rock
Diabase, dolerite, or microgabbro is a medium-grained, dark-colored, hypabyssal, or subvolcanic rock with a composition similar to plutonic gabbro or volcanic basalt. It commonly occurs
Mcnair, B.
A Geologist’s Definitive Guide to Granite Rock
Granite is a coarse-grained, light-colored, plutonic, or intrusive igneous rock. It is dominated by alkali feldspar, quartz, and plagioclase, with other minerals like amphibole, mica,
A Guide to Basalt: A Common, Fine-grained, Dark-Colored Volcanic Rock
Basalt is a hard, fine-grained, dark-colored volcanic or extrusive rock. It has primarily calcium-rich plagioclase and augite. Also, it may have minor amounts of other
Get the Six Lava Flow Types or Morphologies Explained
There are six lava flow types or morphologies: pahoehoe, aa, blocky lava, pillow lava, sheet flow, and lobate. The first three are subaerial, and the
What Are Pillow Lavas? How and Where Do the Form?
Pillow lavas are mound-like tubular, nearly spherical, or pillow-shaped structures associated primarily with submarine or underwater basaltic volcanism. They usually measure 0.1-1 meter or more
What Are Sheet Flow Lavas and How Do They Form?
A sheet flow is a type of submarine lava flow. It has a broad lateral extent relative to its thickness, making it look more like
How Do Blocky Lava Flows Look Like and Form?
Block or blocky lava flows have a fragmented surface with large (usually up to a meter in size), angular to slightly smooth, or planar rubbles,
How Do Pahoehoes Compare and Contrast with Aa Lava Flows?
This post discussion will compare and contrast pahoehoes and aa subaerial lava flows, highlighting their similarities and differences. To give you a hint, some similarities
What Does an Aa Lava Flow Look Like and How Does It Form?
‘A’ā (pronounced “ah-ah”) is a Hawaiian term that describes a lava flow with jagged (sharp and rough) rubbly debris called clinkers, now a geological term accepted