TITLE

Labradorite from Chihuahua, Mexico

AUTHOR(S)
Rockwell, Kimberly; Breeding, Christopher M.
PUB. DATE
December 2006
SOURCE
Gems & Gemology;2006, Vol. 42 Issue 4, p274
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The article describes labradorite varieties from Chihuahua, Mexico. Gem-quality colorless to pale brownish yellow labradorite is recognized from many localities in western North America, including those in Oregon, Mexico, Utah and New Mexico. A large number of the pale yellow labradorite from the Casas Grandes area of Chihuahua State have penetrated the gem market. According to Bill Barker of Barker & Co., the feldspar is taken from a weathered volcanic rock using a hand screening device. Nine samples of the feldspar revealed a rather narrow compositional range that identifed them as labradorite.
ACCESSION #
34132312

 

Related Articles

  • Labradorite's 'Blue Rainbow Moonstone.' Roskin, Gary // JCK;Sep2001, Vol. 172 Issue 9, p91 

    Features the labradorite feldspar gemstone. Confusion with moonstones; Production of spectral color; Details on quality, color and pricing.

  • MOONSTONE (ORTHOCLASE FELDSPAR).  // JCK;Nov2003, Vol. 174 Issue 11, p67 

    Provides information about moonstone. Qualities of the jewel; Price of rainbow moonstones; Hardness of feldspars.

  • Petrographic, Chemical and B-Isotopic Insights into the Origin of Tourmaline-Rich Rocks and Boron Recycling in the Martinamor Antiform (Central Iberian Zone, Salamanca, Spain). A. PESQUERA; J. TORRES-RUIZ; P. P. GIL-CRESPO; S.-Y. JIANG // Journal of Petrology;May2005, Vol. 46 Issue 5, p1013 

    Tourmaline in the Martinamor antiform occurs in tourmalinites (rocks with >1520% tourmaline by volume), clastic metasedimentary rocks of the Upper Proterozoic Monterrubio formation, quartz veins, pre-Variscan orthogneisses and Variscan granitic rocks. Petrographic observations, back-scattered...

  • to·paz.  // American Heritage Student Science Dictionary;2009, p346 

    A definition for the term "topaz" is presented. It refers to a colorless, blue, yellow, brown, or pink mineral consisting largely of aluminum silicate and valued as a gem. Topaz is often found in pegmatites and is the mineral used to represent a hardness of 8 on the Mohs scale. It is also any of...

  • Residence, Resorption and Recycling of Zircons in Devils Kitchen Rhyolite, Coso Volcanic Field, California. JONATHAN S. MILLER; JOSEPH L. WOODEN // Journal of Petrology;Nov2004, Vol. 45 Issue 11, p2155 

    Zircons from the Devils Kitchen rhyolite in the Pleistocene Coso Volcanic field, California have been analyzed by in situ Pb/U ion microprobe (SHRIMP-RG) and by detailed cathodoluminescence imaging. The zircons yield common-Pb-corrected and disequilibrium-corrected 206Pb/238U ages that predate a...

  • The integral model of placer formation in the Voronezh anteclise area. Nenakhov, V.; Zolotareva, G. // Lithology & Mineral Resources;Jan2012, Vol. 47 Issue 1, p23 

    Integral model of Ti-Zr placer formation is proposed for the Voronezh anteclise in the following system: primary source-weathering crust-intermediate collector-placer. It is shown that zircon, the most important useful component in this system, can be zirtolitized intensely during crust...

  • DESCRIPTIONS OF SOME TEXAS ROCKS AND MINERALS: TOPAZ.  // Texas Rocks & Minerals: An Amateur's Guide;1964, p94 

    The article offers a description of topaz that can be found in Texas. Topaz, fluosilicate of aluminium, is a mineral that occurs in crystals of various colours and is used as a gemstone. It is commonly found as prism-shaped crystals, as cleavage fragments, and as regular grains. Crystals,...

  • DESCRIPTIONS OF SOME TEXAS ROCKS AND MINERALS: TOURMALINE.  // Texas Rocks & Minerals: An Amateur's Guide;1964, p94 

    The article offers a description of tourmaline that can be found in Texas. Tourmaline is mineral that is a complex borosilicate and hydroxide of aluminium. It is usually black but occurs in transparent coloured forms that are used as gemstones. Only the dark-coloured varieties of tourmaline have...

  • HEMIMORPHITE.  // Peterson Field Guide to Rocks & Minerals;1996, p333 

    The article presents information on the pyrosilicate mineral hemimorphite. The mineral is white, sometimes slightly stained with iron or copper, brown and blue or green. It is often fluorescent pale orange in longwave ultraviolet light. The best U.S. specimens were found in the Stone Mine,...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics