Mindat Logo


This page is currently not sponsored. Click here to sponsor this page.

Synonym of:Akdalaite

Considered invalid mineral name by the CNMMN. The name akdalaite was substituted for "tohdite" in some publications (e.g., Tilley & Eggleton 1996); however, a mineral likely to be "tohdite" was recently recognized by the CNMMN (Burke & Ferraris 2005). In the latest turn of events, it has been shown that akdalaite has the same properties as synthetic and natural "tohdite." "Tohdite" is pending formal discreditation. (Rosenberg 2006).

Proposal IMA2004-051, hydrous alumina, was approved by the CNMMN (see publications "Minerals approved in 2004"). Several CNMMN members had asked, however, for a reexamination of akdalaite (69-002) which was approved as the first natural hydrous alumina.

The authors of 2004-051 obtained holotype material of akdalaite from the Fersman museum in Moscow, and the re-examination showed that akdalaite and the material for 2004-051 are identical. The previously refined unit cell of akdalaite is incorrect, so that akdalaite and 2004-051 are actually the same mineral species. The name akdalaite has priority; the fact that akdalaite was given a wrong space group does not necessitate a formal redefinition of this mineral. The re-examination and 2004-051 should be published as “New data and a new
occurrence of akdalaite”. The approval decision of the CNMMN on 2004-051 is consequently nullified.

References for Tohdite

Reference List:

- +
Yamaguchi, G., Yanagida, H., and Shuitiro, O. (1964a) new alumina hydrate, "tohdite" (5Al2O3·H2O) Bull. Chem. Soc. Japan: 37: 752-754.

Yamaguchi, G., Yanagida, H., and Shuitiro, O. (1964b) The crystal structure of tohdite. Bull. Chem. Soc. Japan: 37: 1555-1557.

Internet Links for Tohdite

Search Engines:
  • Look for Tohdite on Google
  • Look for Tohdite images on Google
  • Mineral Dealers:
  • Search for Tohdite on Well-Arranged Molecules
  • Fine minerals from bisbeeborn.com
  • Lapis Mineral Magazin
  • Rare and Unusual minerals at Mineralogical Research Company
  • Buy rare minerals from Excalibur Minerals
  • Tohdite specimens for sale - minfind.com
  • Fine Minerals from Weinrich Minerals, Inc.
  • rare and unusual minerals mainly crystallized
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Wilensky Fine Minerals
  • Buy fine minerals and gemstones from Pala International
  • Buy from McDougall Minerals
  • Jobs:
  • Mining & Geology Jobs
  • Mineral and/or Locality  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. 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 thousands 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: January 4, 2014 23:51:38
    Mineral and Locality Search
    and/or Locality:
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds