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
Geology
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
What Are Vugs and How Do They Form
Vugs are small to medium irregular cavities, pores, or voids in rocks often lined with mineral crystals whose composition differs
What Are Amygdales and Amygdaloidal Rocks
Amygdales are small, round, or almond-shaped vesicles partly or fully filled with secondary minerals mostly common in volcanic or extrusive
Amygdaloidal Basalts Texture and Composition
Amygdaloidal basalts are basalt rocks with vesicles partially or fully filled with secondary minerals. The filled vesicles are called amygdales,
What Is Sheeting, Unloading or Exfoliation Weathering
Sheeting, exfoliation, or unloading is a physical weathering process. It happens when deeply buried rocks break into concentric slabs or
Salt Crystal Growth, Wedging, or Salt Weathering
Salt weathering or salt crystal growth is physical or mechanical weathering. It is caused by the growth, expansion, or hydration