Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Question about plaster from Igea - Spain

Posted by Wilfred Hemme  
Wilfred Hemme January 10, 2019 07:41AM
Dear all,

Recently I bought a specimen via Catawiki labelled as plaster from Igea in the La Rioja Region of Spain. According to Mindat plaster (of Paris) is a synonym for bassanite. Further investigation at the internet learned me that the formula of plaster is not corresponding with bassanite. The formula of plaster is similar to gypsum. Is this specimen bassanite indeed or is it a variety of gypsum or something totally different ? My investigation/thoughts might be wrong and I hope somebody is willing to explain me this casus. Many thanks in advance. Cheerse Wilfred

Alfredo Petrov January 10, 2019 07:50AM
Just a linguistic confusion by the label writer, since the spanish word yeso can be translated as either gypsum (the natural mineral) or plaster (the artificial product) depending on the context. Your crystals are gypsum, not bassanite.
Wilfred Hemme January 10, 2019 11:21AM
Dear Alfredo, many thanks for your help. I will classify it as gypsum.
Ted Hadley January 10, 2019 04:32PM
I would like to clarify if I may:

Plaster is made by roasting gypsum to drive out some of the water in its composition, Therefore, fresh, raw plaster after the cooking is Bassanite.

Plaster after it is used, once it has been rehydrated, is Gypsum because the water is restored to its composition.
Wilfred Hemme January 11, 2019 05:35PM
Dear Ted, many thanks for your clarification.
Sorry, only registered users may post in this forum.

Click here to login

Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 23, 2019 01:10:51
Go to top of page