Keratophyre is a type of sodium-rich, marine silicate-aluminum eruptive rock that typically forms in submarine environments. It is closely associated with fine-grained rocks and shares a genetic relationship with them. The term was first introduced by the German geologist C. W. Gombel in 1874, who originally used it to describe a feldspar-rich rock found in the Fichtel Mountains of Germany, specifically one containing albite. This rock is considered a neutral-sea-floor eruptive rock, characterized by its high sodium content and often exhibits a plaque-like texture. The phenocrysts are mainly composed of albite, with smaller amounts of sodium-rich plagioclase and potassium feldspar. Dark-colored porphyritic minerals are rare in this rock type. The groundmass of Keratophyre is cryptocrystalline, primarily made up of albite and sodium-rich plagioclase, with lesser amounts of potassium feldspar, green minerals, mudstone, and calcite. It frequently occurs together with fine-grained rocks, forming what is known as a seabed fine-banded porphyry. The origin of Keratophyre remains debated among geologists. Some suggest it forms from long-stored petrochemicals on the seafloor, while others believe it results from sodium-rich porphyry magma or even basaltic magma intrusions. Despite the uncertainty, its unique composition and formation environment make it an important subject in the study of submarine volcanic activity and igneous petrology. Solid Carbide End Mill For Aluminum HRC58 End Mill for Aluminum,Uncoated End Mill for Aluminum,Carbide End Mill for Aluminum Suzhou Meiwei Cutting Tools LTD , https://www.meiweitools.com