Donate now to keep alive!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
What is a mineral?The most common minerals on earthMineral PhotographyThe Elements and their MineralsGeological TimeMineral Evolution
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch 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 MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Hydroxycalciopyrochlore from a regionally metamorphic marble at Bližná, Czech Republic

Posted by Marco E. Ciriotti  
Marco E. Ciriotti January 11, 2017 06:26PM
▪ Drábek;, M., Frýda J., Šarbach M., Skála, R. (2017): Hydroxycalciopyrochlore from a regionally metamorphic marble at Bližná, Southwestern Czech Republic. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry, 194, 49-59.

We describe an unusual occurrence of hydroxycalciopyrochlore in marble exposed in the Václav graphite mine at Bližná, southern Czech Republic. Roundish grains attain up to 3 cm, and euhedral crystals are up to 2 mm across. An empirical formula, calculated on the basis two B atoms per formula unit (pfu), is: (Ca0.48Na0.02Mg0.06Mn0.01Y0.06ΣREEs0.27Th0.27U0.01)Σ1.12 (Nb1.06Ti0.79Fe0.14W0.01)Σ2 (O4.96OH1.04)Σ6(OH)0.81·H2O. The associated minerals, in addition to the rock-forming minerals calcite, phlogopite and edenite, include ilmenite, magnetite, euxenite, uranoan thorite, rutile, zircon, molybdenite, chalcopyrite, galena, sphalerite, pyrite, pyrrhotite, barite and apatite. This is the first occurrence of a pyrochlore-group mineral in regionally metamorphosed marble. The assemblage is considered to represent a metamorphosed carbonate-dominated sediment containing evaporitic horizons and volcanic detritus. Now give the reader an explanation, what makes it carbonatite-like?
Sorry, only registered users may post in this forum.

Click here to login

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 1993-2018, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 20, 2018 23:02:28
Go to top of page