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Identity HelpQuestion about plaster from Igea - Spain

10th Jan 2019 07:41 UTCWilfred Hemme

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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

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10th Jan 2019 07:50 UTCAlfredo Petrov Manager

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.

10th Jan 2019 11:21 UTCWilfred Hemme

Dear Alfredo, many thanks for your help. I will classify it as gypsum.

10th Jan 2019 16:32 UTCTed Hadley

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.

10th Jan 2019 21:51 UTCWilfred Hemme

-- moved topic --

11th Jan 2019 17:35 UTCWilfred Hemme

Dear Ted, many thanks for your clarification.
 
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