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Home > Art, Film & Photography > Sorosilicates: Tanzanite, Julgoldite, Lawsonite, Epidote, Hemimorphite, Zoisite, Gehlenite, Vesuvianite, Piemontite, Allanite, Sursassite
Sorosilicates: Tanzanite, Julgoldite, Lawsonite, Epidote, Hemimorphite, Zoisite, Gehlenite, Vesuvianite, Piemontite, Allanite, Sursassite

Sorosilicates: Tanzanite, Julgoldite, Lawsonite, Epidote, Hemimorphite, Zoisite, Gehlenite, Vesuvianite, Piemontite, Allanite, Sursassite


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Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Tanzanite, Julgoldite, Lawsonite, Epidote, Hemimorphite, Zoisite, Gehlenite, Vesuvianite, Piemontite, Allanite, Sursassite, Ilvaite, Clinozoisite. Excerpt: Allanite from California Allanite is a sorosilicate group of minerals within the broader epidote group that contain a significant amount of rare earth elements . It has the general formula Ca(Ce,La,Y,Ca)Al2(Fe ,Fe )(SiO4)(Si2O7)O(OH). The International Mineralogical Association lists three minerals in the allanite group, each recognized as a unique mineral: allanite-Ce, allanite-La and allanite-Y, depending on the dominant rare earth present. Allanite, also called orthite, contains up to 20 % rare earth elements and is a valuable source of them. Other elements can also substitute in the structure including thorium . The inclusion of thorium and other radioactive elements results in some interesting phenomena. Allanite often has a halo of radiation damage in the minerals immediately adjacent. Also highly radioactive grains of allanite often have their structure disrupted or are metamict . Allanite is usually black in color, but can be brown to brown-violet. It crystallizes in the monoclinic system and forms prismatic crystals usually disseminated in igneous rocks . It has a Mohs hardness of 5.5 and a specific gravity of 3.3 - 4.2. It is also pyrognomic , meaning that it becomes incandescent at a relatively low temperature -- about 95 C. It was discovered in 1810 and named for the Scottish mineralogist, Thomas Allan (1777-1833). The type locality is Aluk Island , Greenland where it was first discovered by Karl Ludwig Giesecke . References (URLs online) A hyperlinked version of this chapter is at Clinozoisite is a mineral, a complex sorosilicate of calcium and aluminium and is usually a grey green colour. Its formula is Ca2Al3...


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Product Details
  • ISBN-13: 9781155494876
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Tanzanite, Julgoldite, Lawsonite, Epidote, Hemimorphite, Zoisite, Gehlenite, Vesuvianite, Piemontite, Allanite, Sursassite
  • Width: 229 mm
  • ISBN-10: 1155494873
  • Publisher Date: 04 May 2010
  • Binding: Paperback
  • Spine Width: 3 mm
  • Weight: 91 gr


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