Graftonite-(Mn)
A valid IMA mineral species
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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
Member of:
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.
Unique Identifiers
Mindat ID:
52160
Long-form identifier:
mindat:1:1:52160:6
GUID
(UUID V4):
(UUID V4):
25afd2fc-12ea-4133-ba6c-cc56f1100168
IMA Classification of Graftonite-(Mn)
Approved
Approval year:
2017
First published:
2018
Type description reference:
Pieczka, Adam, Hawthorne, Frank C., Ball, Neil, Abdu, Yassir, Gołębiowska, Bożena, Włodek, Adam, Żukrowski, Jan (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 (6) 1307-1322 doi:10.1180/minmag.2017.081.109
Classification of Graftonite-(Mn)
8.AB.20
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
B : With medium-sized cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
B : With medium-sized cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Gft-Mn | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Graftonite-(Mn)
Vitreous
Transparency:
Transparent
Colour:
Pinkish brown
Hardness:
5 on Mohs scale
Comment:
~5
Tenacity:
Brittle
Cleavage:
Distinct/Good
Fracture:
Irregular/Uneven
Density:
3.793 g/cm3 (Calculated)
Optical Data of Graftonite-(Mn)
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.
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Non-pleochroic
Comments:
Colourless in all orientations,
Chemistry of Graftonite-(Mn)
Mindat 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.
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.
Elements listed:
Crystallography of Graftonite-(Mn)
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)°
β = 99.23(3)°
Ratio:
a:b:c = 0.767 : 1 : 0.534
Unit Cell V:
613.5 ų
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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 Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 2: Planetesimal differentiation and alteration | 4.566-4.550 |
| 5 : Primary asteroid phases | 4.566–4.560 |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Graftonite-(Mn)
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)(Fe1.34Mn0.60Mg0.06Zn0.01)Σ3(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)
Relationship of Graftonite-(Mn) to other Species
Member of:
Other Members of this group:
| Beusite | Mn2+Mn2+2 (PO4)2 | Mon. 2/m : P21/b |
| Beusite-(Ca) | CaMn2+2(PO4)2 | Mon. 2/m : P21/b |
| Graftonite | Fe2+Fe2+2(PO4)2 | Mon. 2/m : P21/b |
| Graftonite-(Ca) | CaFe2+2(PO4)2 | Mon. 2/m : P21/b |
Related Minerals - Strunz-mindat Grouping
| 8.AB. | Rodolicoite | Fe3+PO4 |
| 8.AB. | Johanngeorgenstadtite | Ni2+4.5(AsO4)3 |
| 8.AB. | Borisenkoite | Cu3[(V,As)O4]2 |
| 8.AB. | Niasite | Ni2+4.5(AsO4)3 |
| 8.AB. | Olsenite | KFe4(PO4)3 |
| 8.AB. | Karwowskiite | Ca9Mg(Fe2+0.5◻0.5)(PO4)7 |
| 8.AB.05 | Farringtonite | Mg3(PO4)2 |
| 8.AB.10 | Ferrisicklerite | Li1-x(Fe3+xFe2+1-x)PO4 |
| 8.AB.10 | Heterosite | (Fe3+,Mn3+)PO4 |
| 8.AB.10 | Lithiophilite | LiMn2+PO4 |
| 8.AB.10 | Natrophilite | NaMn2+PO4 |
| 8.AB.10 | Purpurite | Mn3+(PO4) |
| 8.AB.10 | Sicklerite | Li1-x(Mn3+xMn2+1-x)PO4 |
| 8.AB.10 | Simferite | LiMg(PO4) |
| 8.AB.10 | Triphylite | LiFe2+PO4 |
| 8.AB.10 | Karenwebberite | NaFe2+PO4 |
| 8.AB.15 | Sarcopside | (Fe2+,Mn2+,Mg)3(PO4)2 |
| 8.AB.15 | Chopinite | (Mg,Fe2+)3(PO4)2 |
| 8.AB.15 | Zavalíaite | (Mn2+,Fe2+,Mg)3(PO4)2 |
| 8.AB.20 | Beusite | Mn2+Mn2+2 (PO4)2 |
| 8.AB.20 | Graftonite | Fe2+Fe2+2(PO4)2 |
| 8.AB.20 | Graftonite-(Ca) | CaFe2+2(PO4)2 |
| 8.AB.20 | Beusite-(Ca) | CaMn2+2(PO4)2 |
| 8.AB.25 | Xanthiosite | Ni3(AsO4)2 |
| 8.AB.30 | Lammerite | Cu3(AsO4)2 |
| 8.AB.30 | Paralammerite | Cu3(AsO4)2 |
| 8.AB.35 | Mcbirneyite | Cu3(VO4)2 |
| 8.AB.35 | Stranskiite | Zn2Cu(AsO4)2 |
| 8.AB.35 | Pseudolyonsite | Cu3(VO4)2 |
| 8.AB.40 | Lyonsite | Cu3Fe4(VO4)6 |
| 8.AB.40 | Michalskiite | Fe3+1.33Cu2+2(MgFe3+)2(VO4)6 |
Fluorescence of Graftonite-(Mn)
Not fluorescent.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Graftonite-(Mn)
mindat.org URL:
https://www.mindat.org/min-52160.html
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References for Graftonite-(Mn)
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2017) New minerals and nomenclature modifications approved in 2017, CNMNC Newsletter No 39. Mineralogical Magazine, 81 (5) 1279-1286 doi:10.1180/minmag.2017.081.072
Pieczka, Adam, Hawthorne, Frank C., Ball, Neil, Abdu, Yassir, Gołębiowska, Bożena, Włodek, Adam, Żukrowski, Jan (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 (6) 1307-1322 doi:10.1180/minmag.2017.081.109
Localities for Graftonite-(Mn)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Italy | |
| Vignola (2018) |
Poland (TL) | |
| Mineralogical Magazine: 81: 1279–1286. +2 other references |
Ukraine | |
| Britvin et al. (2020) |
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