Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
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
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
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

Mineralogical ClassificationIMA 2016-116 = ferro-tschermakite

3rd May 2018 16:22 UTCMarco E. Ciriotti Manager

Reference:

▪ Oberti, R., Boiocchi, M., Hawthorne, F.C., Ciriotti M.E. (2018): Ferro-tschermakite from the Ploumanac'h granitic complex, Brittany, France: mineral description. European Journal of Mineralogy, 30, 171–176.


Abstract:

The mineral description is provided for ferro-tschermakite, ideally A□BCa2C(Fe2+3Al2)T(Si6Al2)O22W(OH)2. The type specimen has been found in the dump of the B.G.P. (Bâtiment et Granit de Ploumanac'h) northern granite quarry, La Clarté, Perros-Guirec, Ploumanac'h granitic complex, Brittany, France. The empirical formula derived from electron microprobe analysis and single-crystal structure refinement is: A(Na0.29K0.08)Σ=0.37 B(Ca1.69Fe2+0.11Mn2+0.02Na0.18)Σ=2.00 C(Fe2+1.84Mg1.54Al1.33Fe3+0.24V3+0.01Ti0.04)Σ=5.00 T(Si6.15Al1.85)Σ=8.00 O22 W(OH1.94F0.06)Σ=2.00. Ferro-tschermakite is biaxial (-), with α = 1.666(2), β = 1.680(2), γ = 1.690(2) and 2V (meas.) = 84(1)º, 2V (calc.) = 79.8. The unit-cell parameters are a = 9.7598(6), b = 18.0220(11), c = 5.3299(3) Å, β = 104.826(1)°, V = 906.27 (9) Å3, Z = 2, space group C2/m. The strongest ten reflections in the X-ray powder pattern obtained from single-crystal data [d values (in Å), I, (hkl)] are: 8.359, 100, (110); 2.708, 84, (151); 3.098, 55, (310); 2.552, 43, (-202); 2.595, 41, (061); 2.330, 33, (-351); 2.159, 27, (261); 2.936, 27, (221); 3.338, 27, (131); 2.012, 24, (-402; 351).

10th Aug 2018 01:59 UTCRonnie Van Dommelen 🌟 Manager

Page updated
 
Mineral and/or Locality  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
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: March 28, 2024 23:19:53
Go to top of page