Talc Mineral Data - Mineralogy Database

Talc Mineral Data ; Help on Composition: Composition: Molecular Weight = 379.27 gm ; Magnesium 19.23 % Mg 31.88 % MgO ; Silicon 29.62 % Si 63.37 % SiO ; Hydrogen ... Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share       News Help About Advertisment GeneralTalcInformation ChemicalFormula: Mg3Si4O10(OH)2 Composition: MolecularWeight=379.27gm    Magnesium  19.23 %  Mg   31.88 % MgO    Silicon    29.62 %  Si   63.37 % SiO2    Hydrogen    0.53 %  H     4.75 % H2O    Oxygen     50.62 %  O              ______        ______               100.00 %      100.00 % = TOTAL OXIDE EmpiricalFormula: Mg3Si4O10(OH)2 Environment: Hydrothermalalterationofnon-aluminousmagnesiansilicates. IMAStatus: ValidSpecies(Pre-IMA)1546 Locality: Commonworldwide.Linkto&nbspMinDat.orgLocationData. NameOrigin: FromtheArabic. NamePronunciation: Talc Synonym: Kerolite   MagnesiumTalc   Soapstone   Steatite-massive   TalcImage Images: Talc Comments:WhiteTalcpseudomorphousafterquartz. Location:Johannezeche,Bavaria,Germany. Scale:NotGiven. ©LouPerloff/PhotoAtlasofMinerals TalcCrystallography AxialRatios: a:b:c=0.5778:1:2.0668 CellDimensions: a=5.27,b=9.12,c=18.85,Z=4;beta=100.016°V=892.17Den(Calc)=2.82 CrystalSystem: Monoclinic-PrismaticH-MSymbol(2/m)SpaceGroup:C2/c XRayDiffraction: ByIntensity(I/Io):9.35(1),1.53(0.55),4.59(0.45), CrystalStructure: Mouse drag1-LMBManipulateStructure drag2-RMBResize/Rotate Keyboard S-StereoPairon/off H-HelpScreen I-DataInfo A-AtomsOn/Off P-PolyhedraOn/Off B-BondsOn/Off HelponAbove GrunerJW,ZeitschriftfurKristallographie,88(1934)p.412-419,Thecrystalstructuresoftalcandpyrophyllite,Locality:HarfordCounty,Maryland,USA ViewAdditionaljPOWDStructurefilesforTalc [1]   PhysicalPropertiesofTalc Cleavage: {001}Perfect Color: Palegreen,White,Graywhite,Yellowishwhite,Brownishwhite. Density: 2.7-2.8,Average=2.75 Diaphaneity: Translucent Fracture: Uneven-Flatsurfaces(notcleavage)fracturedinanunevenpattern. Habit: Foliated-Twodimensionalplatyforms. Habit: Massive-Uniformlyindistinguishablecrystalsforminglargemasses. Habit: Scaly-Morphologylikefishscales. Hardness: 1-Talc Luminescence: Fluorescent,ShortUV=orangeyellow,LongUV=yellow. Luster: Vitreous-Pearly Streak: white   OpticalPropertiesofTalc Gladstone-Dale: CImeas=0.018(Superior)-wheretheCI=(1-KPDmeas/KC)CIcalc=0.042(Good)-wheretheCI=(1-KPDcalc/KC) KPDcalc=0.2028,KPDmeas=0.208,KC=0.2117Ncalc=1.57-1.6 OpticalData: Biaxial(-),a=1.538-1.55,b=1.575-1.594,g=1.575-1.6,bire=0.0370-0.0500,2V(Calc)=0-38,2V(Meas)=0-30.Dispersionnoticeable,r>v. Pleochroism(x): colorless. Pleochroism(y): palegreen.   CalculatedPropertiesofTalc ElectronDensity: BulkDensity(ElectronDensity)=2.76gm/ccnote:SpecificGravityofTalc=2.75gm/cc. FermionIndex: FermionIndex=0.03BosonIndex=0.97 Photoelectric: PETalc=1.57barns/electronU=PETalcxrElectronDensity=4.34barns/cc. Radioactivity: GRapi=0(GammaRayAmericanPetroleumInstituteUnits)TalcisNotRadioactive   TalcClassification DanaClass: 71.02.01.03(71)PhyllosilicateSheetsofSix-MemberedRings   (71.02)with2:1Layers   (71.02.01)Pyrophyllite-talcgroup   71.02.01.01Pyrophyllite Al2Si4O10(OH)2P11   71.02.01.02Ferripyrophyllite Fe2Si4O10(OH)2C2/m2/m   71.02.01.03Talc Mg3Si4O10(OH)2C2/c2/m   71.02.01.04Willemseite (Ni,Mg)3Si4O10(OH)2C2/c2/m   71.02.01.05Minnesotaite (Fe,Mg)3Si4O10(OH)2C11   71.02.01.06Brinrobertsite! (Na,K,Ca)x(Al,Fe,Mg)4(Si,Al)8O20(OH)4•3.54(H2O)[x=0.35,n=3.54]pseudo2/m2/m StrunzClass: 09.EC.0509-SILICATES(Germanates)   09.E-Phyllosilicates   09.EC-Phyllosilicateswithmicasheets,composedoftetrahedralandoctahedralnets   09.EC.05Minnesotaite (Fe,Mg)3Si4O10(OH)2C11   09.EC.05Talc Mg3Si4O10(OH)2C2/c2/m   09.EC.05Willemseite (Ni,Mg)3Si4O10(OH)2C2/c2/m   OtherTalcInformation SeeAlso: LinkstootherdatabasesforTalc: 1-Am.Min.CrystalStructureDatabase 2-AmethystGalleries'MineralGallery 3-Athena 4-EUROminProject 5-EcoledesMinesdeParis 6-FranklinMinerals(Dunn) 7-FranklinMinerals(Palache) 8-GeoScienceWorld 9-GlendaleCommunityCollege 10-GoogleImages 11-GoogleScholar 12-HandbookofMineralogy(MinSocAm) 13-HandbookofMineralogy(UofA) 14-HyperPhysics 15-MinDAT 16-MineralandGemstoneKingdom 17-Mineralienatlas(Deutsch) 18-MineralsinThinSection-UniversityofNorthCarolina 19-MineralsinThinSections-HumboldtState 20-OnlineMineralMuseum 21-QUTMineralAtlas 22-Ruff.Info 23-Scandinavianmineralgallery 24-UCLA-PetrographyThin-Sections 25-WWW-MINCRYST 26-YupRocks SearchforTalcusing:   Web webmineral.com [AOL] [Bing] [DogPile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO] VisitourAdvertisersforTalc: ABijouxGoogleSearchforTalc Adam'sMineralsGoogleSearchforTalc CapeMineralsGoogleSearchforTalc DakotaMatrixMineralsGoogleSearchforTalc ExcaliburMineralCorp.GoogleSearchforTalc ExceptionalMineralsGoogleSearchforTalc JohnBettsFineMineralsSearchforTalc McDougallMineralsGoogleSearchforTalc MineralNewsWebsiteLink RockandMineralShowsGoogleSearchforTalc WeinrichMinerals,Inc.GoogleSearchforTalc AskaboutTalchere: Ask-A-MineralogistfromtheMineralogicalSocietyofAmerica Mindat.org'sDiscussionGroups OriginalRockhoundsDiscussionGroup RockhoundsDiscussionGrouponYahooGroups MineralDiscussionForumfromFabreMinerals-alsoavailablein Español PrintorCut-and-PasteyourTalcSpecimenLabelhere: Talc Mg3Si4O10(OH)2 DanaNo:71.02.01.03StrunzNo:09.EC.05 Locality:   Notes: