World Library  
Flag as Inappropriate
Email this Article


Article Id: WHEBN0010495039
Reproduction Date:

Title: Ekanite  
Author: World Heritage Encyclopedia
Language: English
Subject: List of minerals, Dispersion (optics)
Publisher: World Heritage Encyclopedia


Category Silicate mineral
(repeating unit)
Ca2ThSi8O20 or (Ca,Fe,Pb)2(Th,U)Si8O20
Color Green, yellow, dark red
Crystal habit Pyramidal crystals, granular to massive
Crystal system Tetragonal
Cleavage Distinct on {101}
Fracture Brittle, uneven
Mohs scale hardness 4.5
Luster Vitreous
Streak White
Diaphaneity Transparent to translucent
Specific gravity 2.95 - 3.28
Optical properties Uniaxial (-) 2V = 10 - 15°
Refractive index nω = 1.580 nε = 1.568
Birefringence δ = 0.012
Other characteristics Radioactive, metamict
References [1][2][3]

Ekanite is an uncommon mineral notable primarily as being among the very few gemstones that are naturally radioactive. Most ekanite is mined in Sri Lanka, although deposits also occur in Russia and North America. Clear and well-colored stones command the best prices, but such stones are rare; the mineral's radioactivity tends to degrade the crystal matrix over time in a process known as metamictization.

Ekanite was first described in 1955 by F. L. D. Ekanayake.[4][5] The mineral is named for Mr. F. L. D. Ekanavake.[6]


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.