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
Mineralogical ClassificationMolybdophyllite: crystal structure, OD character, and relation to britvinite
11th May 2012 14:03 UTCUwe Kolitsch Manager
A detailed crystal-chemical study of the complex layered silicate molybdophyllite was conducted using
single-crystal X-ray diffraction (XRD) methods, supplemented by powder XRD, infrared (IR) and
Raman spectroscopic studies, chemical analyses by energy-dispersive spectrometry (EDS) on a
scanning electron microscope (SEM), and electron probe microanalysis (EPMA). The results, based on
several samples from both Långban and Harstigen, Filipstad, Sweden, show that the crystal structure of
molybdophyllite has an order-disorder (OD) character. The latter is especially evident in specimens
from Långban which display a complex diffraction pattern characterized by the simultaneous presence
of sharp spots, diffuse reflections and continuous streaks. The sharp reflections define the unit cell of
the family structure (a = 3.124, c = 41.832 Å, space group R32). Two main polytypes (maximum
degree of order structures) are indicated by the OD approach: a trigonal one and a monoclinic one; the
latter polytype is the most common in the samples that were studied and has space group C2, with a =
16.232(6), b = 9.373(2), c = 14.060(3) Å, b = 97.36(4)º and V = 2121.5(10) Å3.
The crystal structure determination , together with the EPMA, IR and Raman data,
reveal that molybdophyllite is built up by a regular alternation of complex layers with a composition
{Mg92}6+ and simple layers with a composition <(CO3)3·H2O>6-, leading to the
ideal crystal-chemical formula Pb8Mg9·H2O (Z = 2).
This contribution is mainly devoted to the results obtained for molybdophyllite sensu stricto, but
new data for britvinite are also presented and its modular relationship
with molybdophyllite is discussed.
PDF available for interested people. Send PM or reply here.
11th May 2012 16:09 UTCHarald Oskar Folvik
Harald F.
11th May 2012 17:13 UTCSteven Kittleson
I know it's totally off-subject, but I was expecting some Mo in the formula, instead of lead, going by the name. I was thinking PLUMBOphyllite maybe...silly me. Talk about naming issues. BTW, being a native NJian, I still prefer Hancockite.
Back to subject...TTFN.
To absent friends...in memory...still bright.
11th May 2012 18:05 UTCUwe Kolitsch Manager
Steven: "molybdos" (Greek) means lead. The mineral was named in 1901 when naming minerals using Greek words was much more common than today.
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 17, 2024 18:34:45
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 17, 2024 18:34:45