This type of metamorphic rock has been buried very deep and squeezed very hard. In many cases, the darker part of the rock (consisting of biotite mica and hornblende) has been intruded by veins of lighter rock consisting ofquartzandfeldspar. With its curling light and dark veins, migmatite ...
Pictures of Metamorphic RocksPhotos of Common Foliated and Non-Foliated Metamorphic Rock TypesArticle by: Hobart M. King, PhD, RPGAmphibolite is a non-foliated metamorphic rock that forms through recrystallization under conditions of high viscosity and directed pressure. It is composed primarily of ...
Slate is a fine-grained, foliated metamorphic rock that is created by the alteration of shale or mudstone by low-grade regional metamorphism. It is popular for a wide variety of uses such as roofing, flooring, and flagging because of its durability and attractive appearance.Composition...
1) If you are not sure about your rock specimen (mostly the name or the kind of rock), you should create before a new thread at "What is it? - Where is it from?" section giving the pictures and as much information as possible. ...
Schists are often named according to the eye-visible minerals of metamorphic origin that are obvious and abundant when the rock is examined. Muscovite schist, biotite schist, and chlorite schist (often called "greenstone") are commonly used names. Other names based upon obvious metamorphic minerals...
Between these areas, the names "quartzite" and "sandstone" are used inconsistently and often guided by habit. It is often called "quartzite" when rock units above and below it are clearly sedimentary. This contributes to the inconsistency in the ways that geologists use the word "quartzite.""...
However, this long-time practice of the dimension stone trade simplifies discussions with customers since not everyone knows the technical names of unusual igneous and metamorphic rocks.Rock & Mineral Kits: Get a rock, mineral, or fossil kit to learn more about Earth materials. The best way to...
Phyllite: A specimen of phyllite that exhibits the lustrous and wrinkled surface common to this rock type. ADVERTISEMENT What Is Phyllite? Phyllite is a foliated metamorphic rock that has been subjected to low levels of heat, pressure and chemical activity. It is composed mainly of flake-shaped...
The name "hornfels" is assigned to a rock after considering its grain size, texture, and geologic history. As a result, hornfels does not have a specific chemical or mineralogical composition. It inherits its composition from the rocks that are metamorphosed plus the fluids involved in the me...
In a freshly-broken hand specimen, they might only be recognized as a sugary sparkle of light reflecting from their tiny cleavage faces when the rock is played in the light. As metamorphism progresses, the crystals grow larger and become easily recognizable as interlocking crystals of calcite. ...