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
Rocks
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,
Andesite Rock Composition and Formation
Andesite is an intermediate volcanic or extrusive igneous rock. Intermediate rocks are moderate in silica (52-63 wt.%), mafic, and felsic
Understanding Ultramafic Rocks, Magmas or Minerals
Ultramafic is a common term in geology, GEOsciences, Earth sciences, or geography. It is commonly used in igneous rocks, their
Coarse-Grained or Phaneritic Texture
The coarse-grained or phaneritic texture is an igneous rock texture in which you can see and distinguish individual minerals without
Carbonatites Composition and Formation
Carbonatites are uncommon and strange igneous rocks with more than 50% carbonate minerals by volume and less than 20 wt.
Dunite Rock Composition and Uses
Dunite is an ultramafic plutonic or intrusive igneous rock in which olivine exceeds 90% by volume. Ultramafic means it has
Pyroxenite Rock Composition and Formation
Pyroxenite is coarse-grained ultramafic, mostly plutonic rock. Ultramafic means they have at least 90% dark-colored minerals rich in iron and