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Graftonite-(Mn)

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Formula:
MnFe2+2(PO4)2
Structural formula (from type description):M(1)MnM(2),M(3)Fe2(PO4)2. The M(1) site is occupied dominantly by Mn in graftonite-(Mn), and the M(2) and M(3) sites are occupied by Fe2+ and Mn2+, with Fe2+ dominant over Mn2+ at the aggregate M(2) + M(3) sites.
Colour:
Pinkish brown
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
3.793 (Calculated)
Crystal System:
Monoclinic
Name:
Named for its relation to graftonite and the dominant cation on the M(1) site. Graftonite was named by Samuel L. Penfield in 1900 for the type locality on Melvin Mountain, Grafton, Grafton County, New Hampshire, USA.
A primary phosphate mineral found in phosphate nodules.


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Classification of Graftonite-(Mn)Hide

Approved
Approval Year:
2017
First Published:
2018

Physical Properties of Graftonite-(Mn)Hide

Vitreous
Transparency:
Transparent
Colour:
Pinkish brown
Hardness:
Comment:
~5
Tenacity:
Brittle
Cleavage:
Distinct/Good
Fracture:
Irregular/Uneven
Density:
3.793 g/cm3 (Calculated)

Optical Data of Graftonite-(Mn)Hide

Type:
Biaxial (+)
RI values:
nα = 1.710(2) nβ = 1.710(2) nγ = 1.725(2)
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Non-pleochroic
Comments:
Colourless in all orientations,

Chemical Properties of Graftonite-(Mn)Hide

Formula:
MnFe2+2(PO4)2

Structural formula (from type description):M(1)MnM(2),M(3)Fe2(PO4)2. The M(1) site is occupied dominantly by Mn in graftonite-(Mn), and the M(2) and M(3) sites are occupied by Fe2+ and Mn2+, with Fe2+ dominant over Mn2+ at the aggregate M(2) + M(3) sites.

Crystallography of Graftonite-(Mn)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 8.811(2) Å, b = 11.494(2) Å, c = 6.138(1) Å
β = 99.23(3)°
Ratio:
a:b:c = 0.767 : 1 : 0.534
Unit Cell V:
613.5 ų

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.506 Å(73)
3.016 Å(35)
2.953 Å(55)
2.916 Å(53)
2.899 Å(44)
2.874 Å(100)
2.858 Å(79)
2.717 Å(56)

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of Graftonite-(Mn)Hide

Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineralogical Museum, University of Wrocław, Cybulskiego 30, 50-205 Wrocław, Poland, catalogue number MMWr IV7927
Empirical Formula of Type Material:
M(1)(Mn0.70Ca0.30)M(2),M(3)(Fe1.34Mn0.60Mg0.06Zn0.013(PO4)2
Geological Setting of Type Material:
Beryl–columbite–phosphate pegmatite.
Associated Minerals at Type Locality:
Reference:
Pieczka, A., Hawthorne, F.C., Ball, N., Abdu, Y., Gołębiowska, B., Włodek, A., Żukrowski, J. (2018): Graftonite-(Mn), ideally M1MnM2,M3Fe2(PO4)2, and graftonite-(Ca), ideally M1CaM2,M3Fe2(PO4)2, two new minerals of the graftonite group from Poland. Mineralogical Magazine, 82: 1307-1322.

Synonyms of Graftonite-(Mn)Hide

Relationship of Graftonite-(Mn) to other SpeciesHide

Other Members of this group:
BeusiteMn2+Mn2+2 (PO4)2Mon.
Beusite-(Ca)CaMn2+2(PO4)2Mon. 2/m : P21/b
GraftoniteFe2+Fe2+2(PO4)2Mon. 2/m : P21/b
Graftonite-(Ca)CaFe2+2(PO4)2Mon. 2/m : P21/b

Fluorescence of Graftonite-(Mn)Hide

Not fluorescent.

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.

References for Graftonite-(Mn)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hawthorne, F.C., Pieczka, A., Gołębiowska, B., Włodek, A. and Żukrowski, J. (2017) Graftonite-(Mn), IMA 2017-050. CNMNC Newsletter No. 39, October 2017, page 1282; Mineralogical Magazine: 81: 1279–1286.
Pieczka, A., Hawthorne, F.C., Ball, N., Abdu, Y., Gołębiowska, B., Włodek, A., Żukrowski, J. (2018): Graftonite-(Mn), ideally M1MnM2,M3Fe2(PO4)2, and graftonite-(Ca), ideally M1CaM2,M3Fe2(PO4)2, two new minerals of the graftonite group from Poland. Mineralogical Magazine, 82, 1307-1322.

Internet Links for Graftonite-(Mn)Hide

Localities for Graftonite-(Mn)Hide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Poland (TL)
 
  • Lower Silesian Voivodeship
    • Świdnica County
      • Gmina Świdnica
Hawthorne, F.C., Pieczka, A., Gołębiowska, B., Włodek, A. and Żukrowski, J. (2017) Graftonite-(Mn), IMA 2017-050. CNMNC Newsletter No. 39, October 2017, page 1282; Mineralogical Magazine: 81: 1279–1286. ;Pieczka, A., Hawthorne, F.C., Ball, N., Abdu, Y., Gołębiowska, B., Włodek, A., Żukrowski, J. (2018): Graftonite-(Mn), ideally M1MnM2,M3Fe2(PO4)2, and graftonite-(Ca), ideally M1CaM2,M3Fe2(PO4)2, two new minerals of the graftonite group from Poland. Mineralogical Magazine, 82: 1307-1322.
Ukraine
 
  • Dnipropetrovsk Oblast
Britvin, S.N.; Krivovichev, S.V.; Obolonskaya, E.V.; Vlasenko, N.S.; Bocharov, V.N.; Bryukhanova, V.V. (2020) Xenophyllite, Na4Fe7(PO4)6, an Exotic Meteoritic Phosphate: New Mineral Description, Na-ions Mobility and Electrochemical Implications. Minerals 10, 300.
 
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