Glossary of volcanic terms. - University of Wisconsin Oshkosh. G. J. Hudak. 2001.
Lithophysa — A lithophysa (plural lithophysae) is a small cavity found in felsic volcanic rocks believed to be caused by expanding gases in tuffs before solidification. If it has become lined with crystals it may be referred to as a geode or a thunderegg. The … Wikipedia
Spherulite — Spherulites, in petrology, 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, with a duller… … Wikipedia
igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary … Universalium
Volcanic rock — is an igneous rock of volcanic origin. Texture Volcanic rocks are usually fine grained or aphanitic to glassy in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are… … Wikipedia
Volcanogenic massive sulfide ore deposit — Volcanogentic massive sulfide ore deposit at Kidd Mine, Timmins, Ontario, Canada, formed 2.4 billion years ago on an ancient seafloor. Volcanogenic massive sulfide ore deposits (VMS ) are a type of metal sulfide ore deposit, mainly Cu Zn Pb which … Wikipedia
Iddings — Joseph Paxson Iddings (* 21. Januar 1857 in Baltimore, Maryland, Vereinigte Staaten; † 8. September 1920 in Brinklow, Maryland) war ein US amerikanischer Geologe. Inhaltsverzeichnis 1 Familiäres 2 Leben und Werk … Deutsch Wikipedia
Joseph Paxson Iddings — (* 21. Januar 1857 in Baltimore, Maryland, Vereinigte Staaten; † 8. September 1920 in Brinklow, Maryland) war ein US amerikanischer Geologe. Inhaltsverzeichnis 1 Familiäres 2 Leben und Werk … Deutsch Wikipedia
Joseph Paxton Iddings — Joseph Paxson Iddings (* 21. Januar 1857 in Baltimore, Maryland, Vereinigte Staaten; † 8. September 1920 in Brinklow, Maryland) war ein US amerikanischer Geologe. Inhaltsverzeichnis 1 Familiäres 2 Leben und Werk … Deutsch Wikipedia
Fayalite — Catégorie IX : silicates[1] Fayalite Coso Hot Springs, Californie, États Unis (XX 1 mm) … Wikipédia en Français
olivine — olivinic /ol euh vin ik/, olivinitic /ol euh vi nit ik/, adj. /ol euh veen , ol euh veen /, n. Mineral. any of a group of magnesium iron silicates, (Mg,Fe)2SiO4, occurring in olive green to gray green masses as an important constituent of basic… … Universalium
