Pegmatites Rock Characteristics and Formation
Pegmatites are intrusive or plutonic rocks with unusually large mineral crystals. Typical grains are > 1cm (0.4 inches). Some are
What Is Physical or Mechanical Weathering and Examples
Physical or mechanical weathering is the breakdown of rocks into smaller pieces, fragments, or grains without much chemical or mineral
Gabbroic Rocks and Gabbro Varieties
Gabbroic rocks or gabbroids are coarse-grained, dark-colored mafic rocks. A mafic rock is one rich in iron and magnesium. These
Basalt Rock Types and Varieties
There are several basalt rock types and varieties you should know. However, before going to the time, not everyone knows
How Does Andesite and Basalt Differ
Both andesite and basalt are fine-grained, volcanic, or extrusive igneous rocks. Volcanic or extrusive rocks form on the Earth’s surface.
Gabbro Texture, Composition and Uses
Gabbro is a dense, coarse-grained, dark-colored mafic rock. It is mostly a plutonic rock but can also be extrusive/subsurface. Mafic
Diabase or Dolerite Properties and Composition
Dolerite, diabase, or formally microgabbro, is a dark-colored, medium-grained subvolcanic rock equivalent to basalt or gabbro in composition. Subvolcanic or
Basalt Properties, Composition and Formation
Basalt is a mafic or dark-colored, volcanic or extrusive igneous rock. Mafic refers to rocks high in dark-colored minerals rich
What Are Thundereggs (Thunder Eggs) and Where to Find Them?
Thundereggs or thunder eggs are nearly spherical structures or rocky bodies filled with mineral masses or crystals in rhyolite volcanic
What are Druses or Druzy Crystals, and their Examples
Druses are small to medium irregular cavities in rocks lined by small, well-formed clusters or aggregates of projecting crystals, usually