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 ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic Time
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral Quiz
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography
╳Discussions
💬 Home🔎 Search📅 LatestGroups
EducationOpen discussion area.Fakes & FraudsOpen discussion area.Field CollectingOpen discussion area.FossilsOpen discussion area.Gems and GemologyOpen discussion area.GeneralOpen discussion area.How to ContributeOpen discussion area.Identity HelpOpen discussion area.Improving Mindat.orgOpen discussion area.LocalitiesOpen discussion area.Lost and Stolen SpecimensOpen discussion area.MarketplaceOpen discussion area.MeteoritesOpen discussion area.Mindat ProductsOpen discussion area.Mineral ExchangesOpen discussion area.Mineral PhotographyOpen discussion area.Mineral ShowsOpen discussion area.Mineralogical ClassificationOpen discussion area.Mineralogy CourseOpen discussion area.MineralsOpen discussion area.Minerals and MuseumsOpen discussion area.PhotosOpen discussion area.Techniques for CollectorsOpen discussion area.The Rock H. Currier Digital LibraryOpen discussion area.UV MineralsOpen discussion area.Recent Images in Discussions
Identity HelpThin section staining
7th Dec 2017 08:38 UTCAbrag (Aloma Braganza)
While examining a sandstone thin section slide, I came across blue-stained calcite cement. I performed spot EDS analysis on the cement and it gave Ca, C, O, and Mn peaks. Has anyone come across such absurd staining of calcite?
7th Dec 2017 11:57 UTCBen Grguric Expert
It could be a vegetable stain like H7066 powder but another one specifically for calcite is Rodger's Method which uses copper nitrate, distilled water and ammonium chloride solution. I haven't tried it but its possible the amount of Cu in the thin layer of stain is too small to detect with EDS??
7th Dec 2017 13:48 UTCAlfred L. Ostrander
7th Dec 2017 19:55 UTCPaul Brandes 🌟 Manager
-------------------------------------------------------
> Absurd? Carbonate staining by various methods has
> long been known in petrology.
Agree; what is so absurd about blue staining in a thin section?
Sounds to me like it was stained using Alizarin Red S and Potassium Ferricyanide to check for an iron rich carbonate which, based on the deep blue colour you're seeing, tells me the sandstone is cemented by ferroan calcite.
8th Dec 2017 00:06 UTCPaul Brandes 🌟 Manager
A photo of the slide in question might help.
8th Dec 2017 00:51 UTCBen Grguric Expert
I would have thought if he had an iron-rich carbonate cement in the sandstone his EDS would have yielded an Fe peak.
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 24, 2024 10:44:41
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 24, 2024 10:44:41