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 QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography
Sapphire
A variety ofCorundum
This page is currently not sponsored.Click here to sponsor this page.
Most commonly refers to a bluegem variety ofcorundum, but other coloured varieties ofcorundum are also described as sapphire, except redcorundum, which is better known asruby.
The dehydration ofdiaspore incorundum occurs between 525 and 550 °C, whereasgoethite transforms tohematite between 300 and 325 °C. As bothdiaspore andgoethite may be present as inclusions in rubies, sapphires, and othercorundum varieties (e.g., pink sapphires,padparadscha), these dehydration reactions and phase transformations can be considered important criteria to separate unheated from heated stones, specifically in cases in which other methods (e.g., microscopy, FTIR) are unsuccessful.
Visit gemdat.org forgemological information about Sapphire.
The dehydration ofdiaspore incorundum occurs between 525 and 550 °C, whereasgoethite transforms tohematite between 300 and 325 °C. As bothdiaspore andgoethite may be present as inclusions in rubies, sapphires, and othercorundum varieties (e.g., pink sapphires,padparadscha), these dehydration reactions and phase transformations can be considered important criteria to separate unheated from heated stones, specifically in cases in which other methods (e.g., microscopy, FTIR) are unsuccessful.
Visit gemdat.org forgemological information about Sapphire.
