Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralSearch 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
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
A granitoid having an alkali-feldspar/plagioclase ratio from 0.35-0.1 and <5% quartz

Hide all sections | Show all sections

Classification of SyeniteHide

Sub-divisions of SyeniteHide

Mineralogy of SyeniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Mica > BiotiteA series or subgroup of the Mica Group.

Age informationHide

Age range:
Paleoproterozoic to Permian : 1740 Ma to 261 ± 6 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
1256 ± 6 to 261 ± 6 MaLopingianWhole rock K/Ar
21740 to 1720 MaStatherianU-Pb
Sample references:
1Dalsfjorden, Askvoll, Sogn og Fjordane, NorwayFurnes, H., Mitchell, J.G., Robins, B., Ryan, P., Skjerlie, F. J. (1982): Petrography and geochemistry of peralkaline, ultrapotassic syenite dykes of Middle Permian age, Sunnfjord, West Norway. Norsk Geologisk Tidsskrift, 62, 147-159.
2Yastrebets Massif, Ukrainian Shield, Dnipropetrovs'k Oblast', UkraineOrris, G. J., Grauch, R. I. (2002) Rare Earth element mines, deposits, and occurenes. USGS Open-File Report 02-189, 1-174.

Internet Links for SyeniteHide URL:
Please feel free to link to this page.
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2017, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: September 20, 2017 23:01:39 Page generated: September 6, 2017 17:54:38
Go to top of page