Plagioclase

Locality: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia

Note: The mineral species Plagioclase is not listed in our database for this locality. This specimen may be misidentified or the mindat list of minerals at this locality may be incomplete.

A mineral collectors dream: Crystal rain: A ball of platy crystals of plagioclase ejected as crystal lapillus from the 1975-1976 eruption of the Large Fissure of the Tolbachik volcano during an explosive eruption. The crystals are somewhat damaged from the fall. The crystals are covered by a thin crust of volcanic glass. The plagioclase are mixtures of anorthite-albite. The anorthite contence can be rather low. Bolshoe treshinnoe Tolbachinskoe izverkhenie, by S.A. Fedotov, 1984, page 242 states that the Lapilli consist of 20 to 80% of anorthite. Most of the feldspar of the lapilli are zoned. Specimen size: 2,3 cm. The specimen was provided by the Russian mineralogist Pavel M. Kartashov, and it is now in the collection of OT. Ljostad.

This photo has been shown 2442 times

Photo added: 24th Nov 2004

View User Page & Photos

View Plagioclase Gallery

View Similar Images

Create Talk Page

Light Background

Mineral	and/or Locality
Search Google

Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: 15th Feb 2012 16:34:57