Vote for your favorite mineral in #MinCup26! - Azurite vs. Smithsonite
It's carbonate-vs-carbonate to kick off Mineral Cup 2026 with copper-rich Azurite against zinc-rich Smithsonite.
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 TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced 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 QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Pyrophyllite-Talc Group

A group of related mineral species
This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About Pyrophyllite-Talc GroupHide

This page provides mineralogical data about Pyrophyllite-Talc Group.


Unique IdentifiersHide

Mindat ID:
39702
Long-form identifier:
mindat:1:1:39702:7

Chemical AnalysisHide

Oxide wt%:
 1234
Al2O344.23 %0.59 %0.10 %
SiO251.93 %61.90 %61.30 %61.32 %
Na2O2.68 %0.04 %0.06 %0.02 %
K2O1.16 %0.00 %0.03 %0.02 %
P2O50.07 %
TiO20.02 %0.07 %0.08 %
A12O30.70 %
FeO0.33 %2.99 %5.65 %
MnO0.00 %0.02 %0.05 %
MgO30.58 %29.03 %28.04 %
CaO0.02 %0.09 %0.12 %
Cr2O30.05 %0.06 %
Total:100 %93.66 %94.23 %95.46 %
Empirical formulas:
Sample IDEmpirical Formula
3Mg2.80Fe0.16Ca0.01Na0.01Al0.05Si3.97O10 OH2
4Mg2.71Fe0.31Ca0.01Al0.01Si3.97O10 OH2

Crystal StructureHide

Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File    Best | x | y | z | a | b | c
Rotation
Stop | Start
Labels
Console Off | On | Grey | Yellow
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0020723TalcDrits V A, Guggenheim S, Zviagina B B, Kogure T (2012) Structures of the 2:1 layers of pyrophyllite and talc Clays and Clay Minerals 60 574-5872012Harford County, Maryland, USA0293
0010839TalcPerdikatsis B, Burzlaff H (1981) Strukturverfeinerung am talk Mg3[(OH)2Si4O10] Zeitschrift fur Kristallographie 156 177-1861981Harford County, Maryland, USA0293
0010541TalcGruner J W (1934) The crystal structures of talc and pyrophyllite Zeitschrift fur Kristallographie 88 412-4191934Harford County, Maryland, USA0293
0010542PyrophylliteGruner J W (1934) The crystal structures of talc and pyrophyllite Zeitschrift fur Kristallographie 88 412-4191934Tres Cerritos, Mariposa County, California, USA0293
0000823PyrophylliteLee J H, Guggenheim S (1981) Single crystal X-ray refinement of pyrophyllite-1Tc American Mineralogist 66 350-35719810293
0000286PyrophylliteWardle R, Brindley G W (1972) The crystal structures of pyrophyllite, 1Tc, and of its dehydroxylate American Mineralogist 57 732-75019720293
0000285PyrophylliteWardle R, Brindley G W (1972) The crystal structures of pyrophyllite, 1Tc, and of its dehydroxylate American Mineralogist 57 732-75019720293
CIF Raw Data - click here to close

Synonyms of Pyrophyllite-Talc GroupHide

Relationship of Pyrophyllite-Talc Group to other SpeciesHide

Pyrophyllite-Talc Group Members:
Ferripyrophyllite Fe3+Si2O5(OH)Mon. 2/m
Minnesotaite Fe2+3Si4O10(OH)2Tric. 1 : P1
Pyrophyllite Al2Si4O10(OH)2Tric. 1
Talc Mg3Si4O10(OH)2Tric. 1 : P1
Willemseite Ni3Si4O10(OH)2Mon.
Click on any node to view relationships. Formula-derived relationship network for the group members above. Use Find related species to add formula-neighbour species outside the current group view. Solid links show inferred chemical differences; dashed violet links show same-formula crystallographic differences. Hydration states are not treated as relationship changes. These relationships do not imply any real-world substitution reactions between these species.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Pyrophyllite-Talc Group in petrologyHide

Internet Links for Pyrophyllite-Talc GroupHide

References for Pyrophyllite-Talc GroupHide

Localities for Pyrophyllite-Talc GroupHide

Showing 5,628 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Hide all sections | Show all sections

Locality ListShow

This section is currently hidden. Click the show button to view.
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, 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 and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 1, 2026 09:53:55 Page updated: July 31, 2026 18:15:52
Go to top of page