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Fe2+Fe3+2(PO4)2(OH)2 · 6H2O
Creamy yellow, pale yellow, tan to light brown
Sub-Vitreous, Resinous, Waxy, Greasy, Silky
Specific Gravity:
Crystal System:
Member of:
Named in 1983 by Donald R. Peacor, Pete J. Dunn, and William B. Simmons for its chemical relationship to strunzite.
Dimorph of:
Compare also the related iron(II,III) phosphates ferrolaueite and stewartite and the related iron arsenates symplesite and ferrisymplesite.

Not to be confused with ferristrunzite.

Hide all sections | Show all sections

Classification of FerrostrunziteHide

Approval Year:

D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

11 : (AB)3(XO4)2Zq·xH2O

19 : Phosphates
13 : Phosphates of Fe alone

Physical Properties of FerrostrunziteHide

Sub-Vitreous, Resinous, Waxy, Greasy, Silky
Transparent, Translucent
Creamy yellow, pale yellow, tan to light brown
Three cleavages. One parallel to crystal elongation, one nearly perpendicular to optic normal, one perpendicular to the acute bisectrix Bxa.
2.50 g/cm3 (Measured)    2.57 g/cm3 (Calculated)

Optical Data of FerrostrunziteHide

Biaxial (-)
RI values:
nα = 1.628 nβ = 1.682 nγ = 1.723
Measured: 80° , Calculated: 78°
Max Birefringence:
δ = 0.095
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
weak to distinct, asymmetric
Optical Extinction:
Z^c ~ 3°-8°
X = yellow green, Z = orange

Chemical Properties of FerrostrunziteHide

Fe2+Fe3+2(PO4)2(OH)2 · 6H2O

Crystallography of FerrostrunziteHide

Crystal System:
Cell Parameters:
a = 10.23 Å, b = 9.77 Å, c = 7.37 Å
α = 89.65°, β = 98.28°, γ = 117.26°
a:b:c = 1.047 : 1 : 0.754
Unit Cell V:
646.47 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
8.94 (80)
5.29 (100)
4.47 (30)
4.33 (20)
3.452 (30)
3.277 (40)
3.213 (30)

Type Occurrence of FerrostrunziteHide

Geological Setting of Type Material:
Phosphate replacements of marine shells in sedimentary marl.
Associated Minerals at Type Locality:

Synonyms of FerrostrunziteHide

Other Language Names for FerrostrunziteHide

Relationship of Ferrostrunzite to other SpeciesHide

Member of:
Other Members of this group:
FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
ZincostrunziteZnFe3+2(PO4)2(OH)2·6.5H2OTric. 1 : P1

Common AssociatesHide

VivianiteFe2+3(PO4)2 · 8H2O
Associated Minerals Based on Photo Data:
Beraunite2 photos of Ferrostrunzite associated with Beraunite on
Rockbridgeite1 photo of Ferrostrunzite associated with Rockbridgeite on
Vivianite1 photo of Ferrostrunzite associated with Vivianite on
Strengite1 photo of Ferrostrunzite associated with Strengite on

Related Minerals - Nickel-Strunz GroupingHide

8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon.
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2OOrth. 2 2 2 : P21 21 21
8.DC.10LegranditeZn2(AsO4)(OH) · H2OMon. 2/m : P21/b
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
8.DC.15ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon.
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon.
8.DC.15WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15Cobaltarthurite(Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15UKI-2006-(PO:FeHZn)ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15UKI-2006-(PO:AlCuFeH)Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
8.DC.20BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
8.DC.20CoralloiteMn2+Mn3+2(AsO4)2(OH)2 · 4H2OTric. 1 : P1
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon.
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.25MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.27BerauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric.
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric.
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric.
8.DC.30FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2OTric. 1 : P1
8.DC.32TinticiteFe3+5.34(PO4)3.62(VO4)0.38(OH)4 · 6.7H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24Al(PO4)17O6(OH)12 · 17H2OHex. 6/m : P63/m
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2OTric.
8.DC.50WavelliteAl3(PO4)2(OH,F)3 · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.50AllanpringiteFe3+3(PO4)2(OH)3 · 5H2OMon. 2/m : P21/m
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon.
8.DC.57OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2OOrth. mmm (2/m 2/m 2/m)
8.DC.60CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2OMon. 2/m : P21/b

Related Minerals - Dana Grouping (8th Ed.)Hide · 6H2OTric. 1 : P1 · 5H2OTric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.13.1BarbosaliteFe2+Fe3+2(PO4)2(OH)2Mon. 2/m : P21/b
19.13.2StrengiteFePO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
19.13.3PhosphosideriteFePO4 · 2H2OMon. 2/m
19.13.4DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
19.13.5GiniiteFe2+Fe3+4(PO4)3(OH)5 · 2H2OMon. 2/m : P2/b
19.13.6WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
19.13.7TinticiteFe3+5.34(PO4)3.62(VO4)0.38(OH)4 · 6.7H2OTric. 1 : P1
19.13.8FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
19.13.10BerauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
19.13.11VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m
19.13.12MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1

Fluorescence of FerrostrunziteHide

Not Fluorescent in UV

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 FerrostrunziteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 69: 811.
Peacor, D. R., Dunn, P. J., Simmons, W. B. (1983): Ferrostrunzite, the ferrous iron analogue of strunzite from Mullica Hill, New Jersey. Neues Jahrbuch für Mineralogie, Monatshefte 1983, 524-528.
van Tassel, R., de Grave, E. (1992): Ferrostrunzite from Arnsberg, Sauerland, Germany. Neues Jahrbuch für Mineralogie, Monatshefte 1992, 207-212.
Frost, R. L., Martens, W. N., Kloprogge, T., Williams, P. A. (2002) Vibrational spectroscopy of the basic manganese and ferric phosphate minerals: strunzite, ferrostrunzite and ferristrunzite. Neues Jahrbuch für Mineralogie, Monatshefte, 2002, 481-496.
Frost, R. L.; Weier, M.; Lyon, W. G. (2004): Metavivianite an intermediate mineral phase between vivianite, and ferro/ferristrunzite - a Raman spectroscopic study. Neues Jahrbuch für Mineralogie, Monatshefte 2004, 228-240.

Internet Links for FerrostrunziteHide

Localities for FerrostrunziteHide

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.
  • Hainaut Province (Henegouwen; Hennegau)
    • Mons
      • Blaton
Schnorrer-Köhler, G., (1988): Mineralogische Notizen IV, Der Aufschluss, Vol. 39, 153-168
  • Occitanie
    • Pyrénées-Orientales
Berbain,C., Riley, T., Favreau, G., (2012): Phosphates des pegmatites du massif des Albères (Pyrénées-Orientales). Le Cahier des Micromonteurs. 117, 121-172
        • Collioure (Cotlliure)
BERBAIN. C, RILEY. T, FAVREAU. G, (2012) Phosphates des pegmatites du massif des Albères. Ed Association Française de Microminéralogie
  • Bavaria
    • Upper Palatinate
      • Waidhaus
Wittern: "Mineralfundorte in Deutschland", 2001; Dill, H. G., Weber, B., Gerdes, A., & Melcher, F. (2008). The Fe-Mn phosphate apliteSilbergrube'near Waidhaus, Germany: epithermal phosphate mineralization in the Hagendorf-Pleystein pegmatite province. Mineralogical Magazine, 72(5), 1119-1144.
      • Waldmünchen
        • Althütte
Lapis, 10 (4), 13-17.
  • North Rhine-Westphalia
    • Sauerland
van Tassel, R. and E. de Grave (1992) Ferrostrunzite from Arnsberg, Sauerland, Germany. Neues Jahrb. Mineral., Monatsh., 207–212.
  • Apulia
    • Taranto Province
  • Lombardy
    • Lecco Province
      • Dorio
Vignola et al. (2011): Complex mechanisms of alteration in a graftonite + sacropside+ triphylite association from the Luna pegmatite, Piona, Lecco Province, Italy. Canadian Mineralogist. 49, 765-776.; Vignola P., Diella V., Ferrari E.S., Fransolet A.-M. (2011): Complex mechanisms of alteration in a graftonite + sacropside+ triphylite association from the Luna pegmatite, Piona, Lecco Province, Italy. Can. Mineral., 49, 765-776.
New Zealand
  • South Island
    • Tasman
      • Glenhope
Ralph Merrill - Minerals Unlimited
  • Lower Silesia (Dolnośląskie)
    • Sudetes Mts
      • Sowie Mts
        • Michałkowa (Michelsdorf)
Pieczka, A., Hawthorne, F.C., Gołębiowska, B., Włodek, A., Grochowina, A. (2016): Maneckiite, ideally NaCa2Fe2+2(Fe3+Mg)Mn2(PO4)6(H2O)2, a new phosphate mineral of the wicksite supergroup from the Michałkowa pegmatite, Góry Sowie block, southwestern Poland. Mineralogical Magazine: 80: (in press
    • Świdnica District
Włodek, A., Grochowina, A., Gołębiowska, B., Pieczka, A. (2015): A phosphate-bearing pegmatite from Lutomia and its relationships to other pegmatites of the Góry Sowie Block, southwestern Poland. Journal of Geosciences: 60: 45-72
  • Lappland
    • Kiruna district
      • Svappavaara
Jansson, M. : Två nya fosfatmineral från Leveäniemigruvan: mitridatit och ferrostrunzit Published online:
  • England
    • Cornwall
      • St Agnes District
        • Perranzabuloe
          • Perran Iron Lode (Great Perran Iron Lode)
Weiß, S. (1989): Lapis 14(6), 40-41; Golley, P., and Williams, R. (1995): Cornish Mineral Reference Manual. Endsleigh Publications (Truro), 104 pp.
  • Florida
    • Hardee Co.
      • South Florida Phosphate District
Marc V. Hurst (2012) Central Florida Phosphate District. Southeastern Geological Society Field Trip Guidebook No. 57
    • Polk Co.
      • Central Florida Phosphate District (Bone Valley)
        • Homeland
Marc V. Hurst (2012) Central Florida Phosphate District. Southeastern Geological Society Field Trip Guidebook No. 57
        • Noralyn/Phosphoria Mines (IMC-Agrico)
Marc V. Hurst (2012) Central Florida Phosphate District. Southeastern Geological Society Field Trip Guidebook No. 57
  • Indiana
    • Pike Co.
MinRec 15:351
  • Maine
    • Oxford Co.
      • Newry
King, V. and Foord, E., 1994, Mineralogy of Maine, V. 1; King, V. (ed), 2000, Mineralogy of Maine, V. 2.
  • New Hampshire
    • Grafton Co.
      • Groton
Whitmore & Lawrence, 2004. The Pegmatite Mines Known As Palermo, p.95.
  • New Jersey
    • Gloucester Co.
      • Harrison Township
        • Mullica Hill
Neues Jahrb.Min.,Mh.(1983) 524-528
    • Monmouth Co.
      • Upper Freehold Township
        • Arneytown
C.G.Segeler (personal communication)
RRUFF ID: R100079
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