Galena

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= GALE ﻿ NA  = = Miriam Rueger and McKayla Monthe ﻿ i  =



GAL ﻿ ENA

Galena is composed of the elements sulfur and lead. Galena is listed as a 2.5 on the Moh’s Hardness Scale. Galena’s color mainly consists of a shiny metallic sliver, black, and dull blue. Galena’s streak is normally a dark gray color, but other samples may hint a more silver color. Galena’s density is a 7.6. The structure of Galena is identical to that of hetite, NaCl. Galena’s cleavage is perfect; however its fracture is sub-conchoidal. Galena has one special characteristic that sets it apart from others: it ﻿ has a brighter metallic luster on its cleavage faces than on crystal faces. Galena forms in low and medium-temperature ore veins, along with other sulfide minerals, carbonate minerals, and quartz. These can be found in igneous or sedimentary rocks. It often contains silver as an impurity. Galena is common in several areas of the US. In addition, Mexico, Australia and a number of European countries have considerable deposits. France, Romania, Austria, Belgium, Italy, Spain, and Scotland also contain Galena deposits. An important use for Galena includes that it was often used as a semi conductor, which found use in early wireless communication systems. Galena is also used in such things as lead, paint, and is even used as a radiation shield around x-ray equipment. Galena actually can be found in Dubuque, Iowa.

http://webmineral.com/data/Galena.shtml http://www.google.com/imgres?imgurl=http://fireflyforest.net/images/firefly/2006/April/galena.jpg&imgrefurl=http://fireflyforest.net/firefl y/2006/04/04/galena/&usg=__y3l1O9pepvmezniGdEKKJn0_GIs=&h=400&w=400&sz=79&hl=en&start=0&sig2=lu_XqZIkiK9d2By3Cia 9ng&zoom=1&tbnid=YLRG0b9abl32YM:&tbnh=114&tbnw=136&ei=WsDSTMzJD4OqsAOA1PDXCg&prev=/images%3Fq%3Dgalena%2 6um%3D1%26hl%3Den%26safe%3Dactive%26client%3Dsafari%26sa%3DN%26rls%3Den%26biw%3D1024%26bih%3D604%26tbs%3D isch:10%2C252&um=1&itbs=1&iact=hc&vpx=590&vpy=166&dur=2297&hovh=225&hovw=225&tx=145&ty=153&oei=WsDSTMzJD4OqsA OA1PDXCg&esq=1&page=1&ndsp=16&ved=1t:429,r:14,s:0&biw=1024&bih=604

http://www.galleries.com/minerals/sulfides/galena/galena.htm http://wiki.answers.com/Q/Where_is_the_mineral_galena_found http://en.wikipedia.org/wiki/Galena