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
Feldspar Group
A group of related mineral species
This page is currently not sponsored.Click here to sponsor this page.
Feldspar is the name of a group of aluminium silicate minerals, and is collectively the most common mineral group found on the surface of the Earth. The major rock-forming minerals in the feldspar group includealbite,anorthite,orthoclase andmicrocline.
In petrology, the group is split into two major subgroups:
Alkali feldspar - feldspar minerals poor in calcium, and mostly rich in potassium. At high temperature, the alkali feldspars form a series fromsanidine tohigh albite; the series is incomplete at low temperature. Some workers include barium feldspars (celsian andhyalophane) and probably the rubidium feldsparrubicline, as alkali feldspars.
Plagioclase - thealbite toanorthite series.
Feldspars may contain very minor amounts of OH groups, considered as defects (e.g., Yang et al., 2015).
In petrology, the group is split into two major subgroups:
Alkali feldspar - feldspar minerals poor in calcium, and mostly rich in potassium. At high temperature, the alkali feldspars form a series fromsanidine tohigh albite; the series is incomplete at low temperature. Some workers include barium feldspars (celsian andhyalophane) and probably the rubidium feldsparrubicline, as alkali feldspars.
Plagioclase - thealbite toanorthite series.
Feldspars may contain very minor amounts of OH groups, considered as defects (e.g., Yang et al., 2015).
