Graftonite Mineral Data

Graftonite Mineral Data +

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General Graftonite Information

Chemical Formula:

(Fe++,Mn,Ca)3(PO4)2

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

Empirical Formula:

Fe²⁺_1.8Mn²⁺_0.9Ca_0.3(PO₄)₂

IMA Status:

Valid Species (Pre-IMA) 1900

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after its locality at Grafton, New Hampshire, USA.

Synonym:

ICSD 79905

PDF 35-357

Graftonite Image

Images:

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

Axial Ratios:

a:b:c =0.7666:1:0.5332

Cell Dimensions:

a = 8.87, b = 11.57, c = 6.17, Z = 4; beta = 99.2° V = 625.06 Den(Calc)= 3.74

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.86(1), 3.5(0.9), 2.715(0.7),

Crystal Structure:

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Calvo C , American Mineralogist , 53 (1968) p.742-750, The crystal structure of graftonite

View Additional jPOWD Structure files for Graftonite
[1]

Physical Properties of Graftonite

Cleavage:

[010] Perfect

Color:

Brown, Pink, Dark brown, Reddish brown.

Density:

3.67 - 3.7, Average = 3.68

Diaphaniety:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5 - Apatite

Luminescence:

None.

Luster:

Vitreous - Greasy

Streak:

pale pink

Optical Properties of Graftonite

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

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.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Graftonite

Electron Density:

r_electron=3.60 gm/cc
note: r_Graftonite=3.74 gm/cc.

Fermion Index

Fermion Index = 0.00627
Boson Index = 0.99373

Photoelectric:

PE_Graftonite= 13.52 barns/electron
U=PE_Graftonite x r_electron= 48.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Graftonite is Not Radioactive

Graftonite Classification

Dana Class:

38.3.3.1 (38)Anhydrous Phosphates, etc

(38.3)(A+ B++)3 (XO4)2

(38.3.3)Dana Group

38.3.3.1 Graftonite (Fe,Mn,Ca)3(PO4)2 P 2₁/c 2/m

38.3.3.2 Beusite (Mn,Fe,Ca,Mg)3(PO4)2 P 2₁/c 2/m

Strunz Class:

VII/A.04-20 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions. cations of medium size: Mostly Fe, Mn

VII/A.04 - Sarcopside - Beusite series

VII/A.04-10 Sarcopside (Fe,Mn,Mg)3(PO4)2 P 2₁/a 2/m

VII/A.04-20 Graftonite (Fe,Mn,Ca)3(PO4)2 P 2₁/c 2/m

VII/A.04-30 Beusite (Mn,Fe,Ca,Mg)3(PO4)2 P 2₁/c 2/m

Other Graftonite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Graftonite

(Fe++,Mn,Ca)3(PO4)2
Dana No: 38.3.3.1 Strunz No: VII/A.04-20
Locality:

Notes: