A Complete Latite Rock Guide
Latite is an intermediate volcanic or extrusive rock. It has a fine-grained texture and is often porphyritic. This rock has nearly equal plagioclase and alkali
Rocks
Ignimbrite Appearance and Formation
An ignimbrite or ash-flow tuff is a type of volcanic rock formed from pyroclastic flow deposits. It has poorly sorted pumice fragments, scattered lithic fragments,
What Are Bluestones and What Are They Used for?
Bluestone is a generic, commercial, or cultural name for several types of blue-grayish colored rock. It may mean sandstones, slate, limestones, basalt, or diabase/dolerite rocks
Here Are 11 Most Fascinating Obsidian Types or Varieties
Obsidian is a natural volcanic glass often called a volcanic or extrusive igneous rock. IUGS considers it a mineraloid since it has > 80% glass.
What Is Hydrothermal Metamorphism, and Where Does It Occur?
Hydrothermal metamorphism occurs when hot, water-rich fluids cause a change in the mineral assemblage and/or texture of existing parent (protolith) rocks. It usually has a
A Beginner’s Guide to Understanding Burial Metamorphism
Burial metamorphism is a low-grade regional metamorphism. It occurs when pressure and temperature cause minerals in deeply buried sedimentary and volcanic rocks to partially or
A Must-Read Comprehensive Guide to Norite Rock
Norite is a coarse-grained, dark-colored plutonic rock. It has mainly calcium-rich plagioclase (= labradorite to bytownite) and orthopyroxene (= hypersthene or enstatite) with minor hornblende,
Understanding Trachyte, a Fine-grained Volcanic Rock
Trachyte is fine-grained, usually light-colored volcanic or extrusive igneous rock. It has an intermediate composition with its essential alkali feldspar, lesser plagioclase, and minor mafic
Basanite: A Fine-grained Mafic Volcanic Rock
Basanite is a fine-grained, dark-colored volcanic or extrusive igneous rock. Fine-grained means its grains are too small to see without a microscope. Compositionally, basanite is