{"id":693,"date":"2015-07-05T03:28:00","date_gmt":"2015-07-05T03:28:00","guid":{"rendered":"http:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/?guid=06a64833cf570a4dfa4d747f9d5cc95f"},"modified":"2015-07-05T03:28:49","modified_gmt":"2015-07-05T03:28:49","slug":"inretrospect-a-look-back-into-the-oh-zone-tourmaline-of-the-himalaya-mine","status":"publish","type":"post","link":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/2015\/07\/05\/inretrospect-a-look-back-into-the-oh-zone-tourmaline-of-the-himalaya-mine\/","title":{"rendered":"#InRetrospect – A Look Back – "Into the Oh! Zone" Tourmaline Of The Himalaya Mine"},"content":{"rendered":"

Reprint from the 2010 Issue of Pala Minerals “Minfermation February 2010”<\/p>\n

http:\/\/www.palaminerals.com\/news_2010_v1.php#palaminerals_feb<\/p>\n

Mineral and Mineralogy News<\/h2>\n
<\/a><\/p>\n
Into the Oh! <\/em>Zone<\/h3>\n
A study of Himalaya Mine tourmaline<\/h4>\n\n\n\n
$\"American$ <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Color zoning in tourmaline is well known to enthusiasts of Southern California minerals. Pala\u2019s Tourmaline Buying Guide<\/a> includes a couple of lovely examples of the natural phenomenon.
Slices of bi-color \u201cwatermelon\u201d tourmaline are the centerpieces around which jewelry creations are crafted. San Diego County\u2019s Himalaya Mine, which has a role in our chronicle<\/a> of Pala International\u2019s 40 years in the trade, produced color-zoned tourmaline for more nearly the entire 20th century. This month, in the Mineralogical Society of America\u2019s journal, American Mineralogist, <\/em>a remarkable \u201cstrongly color-zoned crystal\u201d from the Himalaya is amongst the mine\u2019s specimens discussed at some length.
\u201cTourmaline of the elbaite-schorl series from the Himalaya Mine, Mesa Grande, California: A detailed investigation\u201d (abstracted herehttp:\/\/ammin.geoscienceworld.org\/content\/95\/1\/24.abstract<\/a>) is a study authored by an international group from Europe and the U.S.: Andreas Ertl, George R. Rossman, John M. Hughes, David London, Ying Wang, Julie A. O\u2019Leary, M. Darby Dyar, Stefan Prowatke, Thomas Ludwig, and Ekkehart Tillmanns.<\/p>\n\n\n\n\n
$\"Tourmaline$ <\/td>\n<\/tr>\n
Black and white\u2026 <\/span>and so much in between, from a black core of \u201coxy-schorl\u201d to an icing of colorless fluor-elbaite. (Photo courtesy George R. Rossman, California Institute of Technology)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
The study\u2019s abstract discusses the rising, and sometimes falling, chemical profusions of elements in the color-zoned crystal, pictured above. Samples from the mine were investigated using a range of methods. The study concludes with a discussion of the formation of the tourmaline-bearing cavities in the Himalaya Mine\u2019s dike.<\/p>\n\n\n\n\n\n
$\"Tourmaline$ <\/a><\/td>\n<\/tr>\n
Himalaya Mine tourmaline, above.<\/span> A specimen typical of the mine\u2019s fine production. Double-terminated, with cleavelandite and lepidolite. Three quarters pink with one termination a light cat\u2019s eye green. See Inventory #14185<\/a>.
Tourmaline from Burma, below. <\/span>Two terminated tourmaline crystals on a matrix with cleavelandite and quartz. Bottom side has black tourmaline with diffuse color zoning similar to that discussed in the American Mineralogist <\/em>study. From Letpanhla, Mandalay Division, Mandalay District, Burma. See Inventory #17393<\/a>. (Photos: John McLean)<\/td>\n<\/tr>\n
$\"Tourmaline$ <\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
[back to top<\/a><\/em>]<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Reprint from the 2010 Issue of Pala Minerals “Minfermation February 2010”<\/p>\n
http:\/\/www.palaminerals.com\/news_2010_v1.php#palaminerals_feb<\/p>\n
Mineral and Mineralogy News<\/h2>\n
<\/a><\/p>\n
Into the Oh! <\/em>Zone<\/h3>\n
A study of Himalaya Mine tourmaline<\/h4>\n\n\n\n
$\"American$ <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Color zoning in tourmaline is well known to enthusiasts of Southern California minerals. Pala’s Tourmaline Buying Guide<\/a> includes a couple of lovely examples of the natural phenomenon.
Slices of bi-color “watermelon” tourmaline are the centerpieces around which jewelry creations are crafted. San Diego County’s Himalaya Mine, which has a role in our chronicle<\/a> of Pala International’s 40 years in the trade, produced color-zoned tourmaline for more nearly the entire 20th century. This month, in the Mineralogical Society of America’s journal, American Mineralogist, <\/em>a remarkable “strongly color-zoned crystal” from the Himalaya is amongst the mine’s specimens discussed at some length.
“Tourmaline of the elbaite-schorl series from the Himalaya Mine, Mesa Grande, California: A detailed investigation” (abstracted herehttp:\/\/ammin.geoscienceworld.org\/content\/95\/1\/24.abstract<\/a>) is a study authored by an international group from Europe and the U.S.: Andreas Ertl, George R. Rossman, John M. Hughes, David London, Ying Wang, Julie A. O’Leary, M. Darby Dyar, Stefan Prowatke, Thomas Ludwig, and Ekkehart Tillmanns.<\/p>\n\n\n\n\n
$\"Tourmaline$ <\/td>\n<\/tr>\n
Black and white… <\/span>and so much in between, from a black core of “oxy-schorl” to an icing of colorless fluor-elbaite. (Photo courtesy George R. Rossman, California Institute of Technology)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
The study’s abstract discusses the rising, and sometimes falling, chemical profusions of elements in the color-zoned crystal, pictured above. Samples from the mine were investigated using a range of methods. The study concludes with a discussion of the formation of the tourmaline-bearing cavities in the Himalaya Mine’s dike.<\/p>\n\n\n\n\n\n
$\"Tourmaline$ <\/a><\/td>\n<\/tr>\n
Himalaya Mine tourmaline, above.<\/span> A specimen typical of the mine’s fine production. Double-terminated, with cleavelandite and lepidolite. Three quarters pink with one termination a light cat’s eye green. See Inventory #14185<\/a>.
Tourmaline from Burma, below. <\/span>Two terminated tourmaline crystals on a matrix with cleavelandite and quartz. Bottom side has black tourmaline with diffuse color zoning similar to that discussed in the American Mineralogist <\/em>study. From Letpanhla, Mandalay Division, Mandalay District, Burma. See Inventory #17393<\/a>. (Photos: John McLean)<\/td>\n<\/tr>\n
$\"Tourmaline$ <\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
[back to top<\/a><\/em>]<\/div>\n<\/div>\n","protected":false},"author":102,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/wp-json\/wp\/v2\/posts\/693"}],"collection":[{"href":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/wp-json\/wp\/v2\/users\/102"}],"replies":[{"embeddable":true,"href":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/wp-json\/wp\/v2\/comments?post=693"}],"version-history":[{"count":1,"href":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/wp-json\/wp\/v2\/posts\/693\/revisions"}],"predecessor-version":[{"id":694,"href":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/wp-json\/wp\/v2\/posts\/693\/revisions\/694"}],"wp:attachment":[{"href":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/wp-json\/wp\/v2\/media?parent=693"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/wp-json\/wp\/v2\/categories?post=693"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/userblogs.ganoksin.com\/flyviewsandreviews\/wp-json\/wp\/v2\/tags?post=693"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}