#amorphism

• Amorphism — The state, property, or character of being amorphous; the total absence of an ordered crystalline structure or a regular geometric shape within a solid body. In mineralogy and crystallography, this phenomenon reflects long-range structural molecular disorder, causing isotropic properties that remain constant in all spatial directions.
• Amorphism — A structural state or property of certain solid bodies of lacking an internal crystalline organization and a regular external shape, their constituent atoms or molecules being randomly arranged. In a biological sense, the term indicates the absence of a clearly defined anatomical conformation or structure in certain lower organisms or parasitic cells.
• Anamorphism — A phenomenon of structural transformation or evolution encountered in geology and optics. In geology and metamorphism, it represents the process of complex reconstruction or transformation of minerals under the action of high pressures and elevated temperatures deep within the Earth's crust, leading to the formation of more stable and denser chemical compounds from simpler substances. In optics, the term describes a controlled geometric distortion or a special optical projection through which an image is intentionally deformed in one direction.
• Anatexis — A deep geological process of partial or total melting of pre-existing rocks within the lower crust (metamorphic or igneous) under the action of extremely high temperatures and pressures. Representing the ultimate stage of regional metamorphism (ultrametamorphism), anatexis leads to the formation of secondary granitic magmas and mixed rocks called migmatites, playing a fundamental role in the recycling and structural evolution of the lithosphere.
• Anchimetamorphism — A geological process of incipient, very low-grade metamorphism that marks the transition between diagenesis (sediment consolidation) and regional metamorphism proper (greenschist facies); it occurs at relatively low temperatures and pressures, causing partial recrystallization of clay minerals without completely destroying the original sedimentary structures.
• Astrobleme — An ancient landform representing a highly eroded, metamorphosed, and partially buried impact structure or crater, created by the crash of a large meteorite, asteroid, or comet onto the Earth's surface. Unlike younger craters, an astrobleme is often identified through gravitational anomalies, the presence of shatter cones, and shock-metamorphosed minerals like coesite or stishovite.
• Autometamorphism — A geological process of mineralogical transformation and alteration of an igneous rock, caused in the final stages of its consolidation by its own residual gases, water vapor, and hydrothermal solutions released during magma cooling. This phenomenon transforms unstable primary minerals into new secondary assemblages (such as serpentinization or chloritization of basalts) without the input of external tectonic pressures or temperatures.