WebDefine Spherulites. Spherulites synonyms, Spherulites pronunciation, Spherulites translation, English dictionary definition of Spherulites. n. A small, usually spheroidal body … WebDec 14, 2024 · Obsidian Therapeutics to Present Preclinical Data from cytoDRiVE® Platform and Pipeline at Society for Immunotherapy of Cancer (SITC) Annual Meeting 2024. …
Spherulites - definition of Spherulites by The Free Dictionary
WebJun 22, 2009 · Very beautiful, black obsidian, with small lithophysæ and occasional spherulites, occurs at Obsidian Hill and on the Rio San Diego and in other localities in the … WebObsidian is the most common form of natural glass and occurs in many attractive varieties. Since prehistoric times, people have used this material to make jewelry and carvings as … jaw pressure and heart issues
Devitrification - Wikipedia
WebJun 25, 2008 · We determined the kinetics of spherulite growth in obsidians from Krafla volcano, Iceland. We measured water concentration profiles around spherulites in obsidian by synchrotron Fourier transform infrared spectroscopy. Spherulites are most common in silica-rich glassy rocks. Sometimes they compose the whole mass; more usually they are surrounded by a glassy or felsitic base. When obsidians are devitrified, the spherulites are often traceable, though they may be more or less completely recrystallized or silicified. In the center of a … See more In petrology, spherulites are small, rounded bodies that commonly occur in vitreous igneous rocks. They are often visible in specimens of obsidian, pitchstone, and rhyolite as globules about the size of millet seed or rice grain, … See more Under the microscope the spherulites are of circular outline and are composed of thin divergent fibers that are crystalline as verified with polarized light. Between crossed See more Very large and cavernous spherulites are called lithophysae; they are found in obsidians at Lipari, in Yellowstone Park and other places. The … See more Variolites are a type of radiate fibrous growth, resembling spherulites in many respects, consisting of minute feathery crystals spreading … See more Occasionally spherulites are found that are many centimeters and, even more rarely, up to two or three meters in diameter. Those spherulites, which are more than 20 centimeters in diameter, are called megaspherulites. Near Silver Cliff, Colorado, … See more Artificial glass sometimes crystallizes and contains spherulites that may be as large as a marble. As the glass has little similarity in chemical composition to volcanic obsidians, … See more WebJul 1, 2015 · Spherulites in rhyolitic obsidian provide a record of the thermal history of their host lava during the interval of spherulite growth. We use trace element concentration profiles across spherulites and into the obsidian host from Yellowstone National Park (USA) to reconstruct the conditions that existed during spherulite formation. jaw problems caused by prolia