Mineralogy Database

Graftonite Mineral Data

Search Webmineral :

General Graftonite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mn,Ca)3(PO4)2
Help on Composition: Composition: Molecular Weight = 351.93 gm
   Calcium      3.42 %  Ca    4.78 % CaO
   Manganese   14.05 %  Mn   18.14 % MnO
   Iron        28.56 %  Fe   36.75 % FeO
   Phosphorus  17.60 %  P    40.33 % P2O5
   Oxygen      36.37 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+1.8Mn2+0.9Ca0.3(PO4)2
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1900
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality at Grafton, New Hampshire, USA.
Help on Name Pronunciation: Name Pronunciation: Graftonite + Pronunciation Say GRAFTONITE
Help on Synonym: Synonym: ICSD 79905
  PDF 35-357

Graftonite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Graftonite   Heterosite

Comments: Whitish graftonite intergrown with dark purple to brown heterosite.
Location: Grafton, Grafton County, New Hampshire, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Graftonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7666:1:0.5332
Help on Cell Dimensions: Cell Dimensions: a = 8.87, b = 11.57, c = 6.17, Z = 4; beta = 99.2° V = 625.06 Den(Calc)= 3.74
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.86(1), 3.5(0.9), 2.715(0.7),

Physical Properties of Graftonite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Brown, Pink, Dark brown, Reddish brown.
Help on Density: Density: 3.67 - 3.7, Average = 3.68
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 5 - Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: pale pink

Optical Properties of Graftonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1898,KPDmeas= 0.1926,KC= 0.1887
Ncalc = 1.69 - 1.71
Help on Optical Data: Optical Data: Biaxial (+), a=1.7, b=1.705, g=1.724, bire=0.0240, 2V(Calc)=56, 2V(Meas)=30-60. Dispersion relatively weak.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.

Calculated Properties of Graftonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.60 gm/cc
note: Specific Gravity of Graftonite =3.74 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0062761334
Boson Index = 0.9937238666
Help on Photoelectric: Photoelectric: PEGraftonite = 13.52 barns/electron
U=PEGraftonite x rElectron Density= 48.63 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Graftonite is Not Radioactive

Graftonite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.03)(A+ B++)3 (XO4)2
  (38.03.03)Dana Group Graftonite (Fe,Mn,Ca)3(PO4)2 P 21/c 2/m Beusite (Mn,Fe,Ca,Mg)3(PO4)2 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.AB.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AB -With medium-sized cations
08.AB.20 Beusite (Mn,Fe,Ca,Mg)3(PO4)2 P 21/c 2/m
08.AB.20 Graftonite (Fe,Mn,Ca)3(PO4)2 P 21/c 2/m

Other Graftonite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Graftonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Graftonite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Graftonite :

Ask about Graftonite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa´┐Żol

Print or Cut-and-Paste your Graftonite Specimen Label here :


Dana No: Strunz No: 08.AB.20





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.