Amphibole group Mineral Presentation

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Presentation transcript:

Amphibole group Mineral Presentation by-nc-sa: Giant Gingko University of Minnesota, Department of Geology and Geophysics, Dr. Kent Kirkby. Funded in part by FIPSE. www.geo.umn.edu

Amphibole minerals are found in igneous and metamorphic rocks. Amphibole minerals form needle-like or prism-shaped crystals. USGS The minerals collectively know as asbestos are members of the amphibole mineral group. Most amphibole minerals are not asbestos. by-nc: meganpru

Amphibole is found in intrusive igneous rocks. granite lamprophyre © Bruce Molnia, (Earth Science Image Bank) by-nc-sa: Ron Schott Amphibole is found in intrusive igneous rocks. USGS USGS granodiorite diorite

Amphibole is found in extrusive igneous rocks. Mount St. Helens by-nc-sa: Ron Schott rhyolite USGS USGS dacite andesite

Amphibole is found in metamorphic rocks. USGS Amphibole (dark) and plagioclase (light) crystals in amphibolite. schist gneiss © Cornel Manecan (Earth Science Image Bank) by-nc-nd: GOC53

amphibolite cut by dikes Greenstone belts, named for the green color of amphibole, contain metamorphosed igneous and sedimentary rock. by-nc-sa: Ron Schott by: kevinzim by-nc-sa: Ron Schott metamorphosed limestone with stromatalites metamorphosed pillow basalt

Microscopic photograph of asbestos. The amphiboles in metamorphic rocks can form very long and thin crystals. Microscopic photograph of asbestos. public domain Most commercial asbestos comes from chrysotile, a fibrous variety of the mineral serpentine (amphibole). USGS (Earth Science Image Bank) ATSDR/CDC

Amphibole group Mineral Presentation by-nc-nd: patricia imagines by-nc-nd: Niemster Asbestos was used in older buildings as insulation, roofing material, and other heat or fire proof applications. by-nc: AlbinoFlea University of Minnesota, Department of Geology and Geophysics, Dr. Kent Kirkby. Funded in part by FIPSE. www.geo.umn.edu

Asbestos removal is happening all over the world. by-nc-nd: maxnathans by-nc-nd: Alain Bachellier by-sa: Michael Pereckas by-nc: Erik B

by-nc-sa: Ron Schott by-nd: amishah Amphiboles are an important component of many decorative building stones, where their colors contribute to the stones’ decorative pattern. by-nc-sa: James_C

Jade is made of amphibole or pyroxene, and prized in Chinese, Maori and Aztec cultures. by-nc-sa: libraryman by-nc-sa: mharrsch

Nephrite (an amphibole) and jadeite (a pyroxene) are nearly indistinguishable. © StoneTrust (Earth Science Image Bank) by-nc: Mister Wind-Up Bird by-nc-nd: Hunter333 by-nc-nd: sanofi2498 by-sa: cygnoir

Amphibole group by-nc-sa: Giant Gingko

Amphibole group Mineral Presentation media rights public domain (none) © Copyright. All rights reserved by-nc-sa by by-nd by-sa by-nc-nd Creative Commons Licenses GNU GNU Free Documentation License Our notation description http://creativecommons.org/about/licenses/meet-the-licenses Many of the photos in this presentation were obtained through Flickr and Wikipedia. Funded by FIPSE and by the University of Minnesota. Compiled for Dr. Kent Kirkby, Department of Geology and Geophysics, by Kate Rosok, 2007. Each displayed image retains its original media rights. For educational purposes only; not to be used commercially. University of Minnesota, Department of Geology and Geophysics, Dr. Kent Kirkby. Funded in part by FIPSE. www.geo.umn.edu