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Gormanite

A valid IMA mineral species
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08345770014947674006747.jpg
Gormanite, etc.

Crosscut Creek, Kulan Camp, Rapid Creek, Dawson mining district, Yukon, Canada
04254270017056681958801.jpg
Gormanite, etc.

Rapid Creek, Dawson mining district, Yukon, Canada
06751240014955072306844.jpg
Gormanite, etc.

Rapid Creek, Dawson mining district, Yukon, Canada
08345770014947674006747.jpg
Gormanite, etc.

Crosscut Creek, Kulan Camp, Rapid Creek, Dawson mining district, Yukon, Canada
08545510017056681947749.jpg
Gormanite, etc.

Rapid Creek, Dawson mining district, Yukon, Canada
09558750014950629777157.jpg
Gormanite, etc.

Rapid Creek, Dawson mining district, Yukon, Canada
08345770014947674006747.jpg
Gormanite, etc.

Crosscut Creek, Kulan Camp, Rapid Creek, Dawson mining district, Yukon, Canada
09472610017057705586925.jpg
Gormanite, etc.

Rapid Creek, Dawson mining district, Yukon, Canada
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About GormaniteHide

01242460017056827529235.jpg
Donald Herbert Gorman
Formula:
(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
Colour:
Blue green to dark green
Lustre:
Sub-Vitreous, Greasy
Hardness:
4 - 5
Specific Gravity:
3.10 - 3.13
Crystal System:
Triclinic
Name:
Named by B. Darko Sturman, Joseph A. Mandarino, Mary E. Mrose, and P. J. Dunn in 1981 after Professor Donald Herbert Gorman [b. 1922 Fredericton, New Brunswick, Canada; d. 2020 Toronto, Ontario] exploration mineralogist and professor of mineralogy of the University of Toronto, Canada. Pronounced GAWR•MENAIT.
Isostructural with:
Souzalite
Gormanite-Souzalite Series. The Fe2+ analogue of Souzalite.


Unique IdentifiersHide

Mindat ID:
1729
Long-form identifier:
mindat:1:1:1729:5
GUID
(UUID V4):
364d7882-dcdd-407f-aa11-03f178404823

IMA Classification of GormaniteHide

Classification of GormaniteHide

Strunz-mindat (2024):
8.DC.45

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
Dana 8th ed.:
42.9.2.2

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
Hey's CIM Ref.:
19.14.32

19 : Phosphates
14 : Phosphates of Fe and other metals

Mineral SymbolsHide

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.

SymbolSourceReference
GmIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
GmThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Pronunciation of GormaniteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of GormaniteHide

Lustre:
Sub-Vitreous, Greasy
Transparency:
Transparent, Translucent
Colour:
Blue green to dark green
Streak:
Pale green
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
{001}
Fracture:
Splintery
Density:
3.10 - 3.13 g/cm3 (Measured)    3.11(1) g/cm3 (Calculated)

Optical Data of GormaniteHide

Type:
Biaxial (-)
RI values:
nα = 1.619 nβ = 1.653 nγ = 1.660
2V:
Measured: 53° , Calculated: 48°
Birefringence:
0.041
Max Birefringence:
δ = 0.041
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v strong
Optical Extinction:
Z ∧ b = 14°; X ⊥ {001}.
Pleochroism:
Strong
Comments:
X = colorless; Y = blue, Z = colorless.

Chemistry of GormaniteHide

Mindat Formula:
(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
Elements listed:
Al, Fe, H, Mg, O, P - search for minerals with similar chemistry

Crystallography of GormaniteHide

Crystal System:
Triclinic
Cell Parameters:
a = 11.77(1) Å, b = 5.11(1) Å, c = 13.61(1) Å
α = 90.45°, β = 99.15°, γ = 90.05°
Ratio:
a:b:c = 2.303 : 1 : 2.663
Unit Cell V:
808.13 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Thick acicular crystals, usually in tight divergent groups.

Blades, elongated on [010] with large {001}. Other forms include {100}, {102}, {102}, and {010}.
Twinning:
Composition plane {001}. Twin axis [010].
Comment:
Triclinic, pseudomonoclinic. Point Group: 1 or 1; Space Group: P1 or P1

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0019923GormaniteLe Bail A, Stephens P W, Hubert F (2003) A crystal structure for the souzalite/gormanite series from synchrotron powder diffraction data European Journal of Mineralogy 15 719-7232003Rapid Creek, Yukon, Canada0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
6.70 Å(100)
4.79 Å(60)
3.39 Å(100)
3.34 Å(70)
3.16 Å(70)
3.13 Å(80)
3.10 Å(60)
2.55 Å(70)
Comments:
ICDD 36-403; also 33-638.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
21 : Chemically precipitated carbonate, phosphate, iron formations
22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23)
High-𝑇 alteration and/or metamorphism
31 : Thermally altered carbonate, phosphate, and iron formations
Geological Setting:
Late stage mineralization in granite pegmatite.

Type Occurrence of GormaniteHide

Co-Type Localities:
ⓘ Big Fish River, Dawson mining district, Yukon, Canada
ⓘ Rapid Creek, Dawson mining district, Yukon, Canada
General Appearance of Type Material:
Blue-green elongate crystals (up to 3 x 0.5 x 0.1 mm) in radial aggregates and as blade-like crystals.
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Ontario, Canada, M35123, M35124, M37368.
National Museum of Natural History, Washington, D.C., USA, 137494, 137495, 145741.
Geological Setting of Type Material:
Veins in phosphatic iron stones. Formed at low temperature.
Associated Minerals at Type Locality:
VivianiteSouzaliteSideriteQuartzLudlamite
KryzhanovskiteArrojadite-(KFe)
Reference:
STURMAN, B.D., MANDARINO, J.A., MROSE, M.E. & DUNN, P.J. (1981): Gormanite, Fe2+3Al4(PO4)4(OH)6$2H2O, the ferrous analogue of souzalite, and new data for souzalite. Canadian Mineralogist 19, 381-387.

Synonyms of GormaniteHide

Other Language Names for GormaniteHide

German:Gormanit
Spanish:Gormanita

Relationship of Gormanite to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
86 photos of Gormanite associated with SideriteFeCO3
49 photos of Gormanite associated with QuartzSiO2
20 photos of Gormanite associated with AlbiteNa(AlSi3O8)
18 photos of Gormanite associated with LazuliteMgAl2(PO4)2(OH)2
15 photos of Gormanite associated with GreifensteiniteCa2Fe2+5Be4(PO4)6(OH)4 · 6H2O
15 photos of Gormanite associated with ChildreniteFe2+Al(PO4)(OH)2 · H2O
13 photos of Gormanite associated with WarditeNaAl3(PO4)2(OH)4 · 2H2O
10 photos of Gormanite associated with WhitlockiteCa9Mg(PO4)6(PO3OH)
8 photos of Gormanite associated with Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
7 photos of Gormanite associated with BrazilianiteNaAl3(PO4)2(OH)4

Related Minerals - Strunz-mindat GroupingHide

8.DC.IanbruceiteZn2(AsO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.CésarferreiraiteFe2+ Fe3+2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.FerrivauxiteFe3+Al2(PO4)2(OH)3 · 5H2OTric. 1 : P1
8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon. 2/m : B2/b
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. 2/m : P21/b
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
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.15UM2006-27-PO:FeHZnZnFe3+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.20MagnesiobermaniteMgMn3+2(PO4)2(OH)2 · 4H2OMon. 2 : P21
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
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.25ZincostrunziteZnFe3+2(PO4)2(OH)2 · 6.5H2OTric. 1 : P1
8.DC.27BerauniteFe3+6(PO4)4O(OH)4 · 6H2OMon. m : Bb
8.DC.27TvrdýiteFe2+Fe3+2 Al3(PO4)4(OH)5(H2O)4 · 2H2OMon. 2/m : B2/b
8.DC.27ZincoberauniteZnFe3+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. 1 : P1
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. 1 : P1
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
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.30Kayrobertsonite[MnAl2(PO4)2(OH)2(H2O)4] · 2H2OTric. 1 : P1
8.DC.30KummeriteMn2+Fe3+Al(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.32TinticiteFe3+3(PO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.32KamarizaiteFe3+3(AsO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24AlO6(PO4)17(OH)12 · 75H2OHex. 6/m : P63/m
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric. 1
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.50FluorwavelliteAl3(PO4)2(OH)2F · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon. m : Bm
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
8.DC.62KenngottiteMn2+3Fe3+4(PO4)4(OH)6(H2O)2 Mon. 2/m : P2/b
8.DC.67MolinelloiteCu(H2O)(OH)V4+O(V5+O4)Tric. 1 : P1
8.DC.70WhitecapsiteH16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2OHex. 6/m : P63/m
8.DC.75HeimitePbCu2(AsO4)(OH)3 · 2H2OMon. 2/m
8.DC.80LedneviteCu[PO3(OH)] · H2OMon. 2/m : P21/b

Fluorescence of GormaniteHide

In UV light:
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.

Internet Links for GormaniteHide

References for GormaniteHide

Localities for GormaniteHide

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 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Argentina
 
  • San Luis Province
    • San Martín Department
Roda-Robles et al. (2012)
Austria
 
  • Carinthia
    • Spittal an der Drau District
      • Millstatt lake
G. Niedermayr: Carinthia II 187./107.:176 (1997)
Niedermayr et al. (1995)
      • Reißeck
        • Kolbnitz
Walter et al. (2020)
        • Penk
          • Zwenberger Graben
Walter et al. (2020)
      • Spittal an der Drau
        • Wolfsberg
Pichler (2009)
Brazil
 
  • Minas Gerais
    • Divino das Laranjeiras
Menezes (n.d.)
Menezes Filho et al. (2019)
    • Mendes Pimentel
Pers. Comm. from Paulo Anselmo Matioli +1 other reference
Canada (TL)
 
  • Yukon
    • Dawson mining district
Sturman et al. (1981) +1 other reference
150-152. +3 other references
        • Kulan Camp (Area A; Area 1)
Robinson et al. (1992)
Robinson et al. (1992)
Robinson et al. (1992)
Europe
 
Berbain et al. (2012)
France
 
  • Occitanie
    • Aude
      • Carcassonne
        • Salsigne
Forner et al. (1997)
    • Pyrénées-Orientales
      • Céret
        • Collioure
Berbain et al. (2012)
Namibia
 
  • Erongo Region
    • Karibib Constituency
      • Abbabis Farm 70
Förch (1998)
      • Tsaobismund Farm 85
von Bezing (2007)
Portugal
 
  • Castelo Branco
    • Idanha-a-Nova
      • União de Freg de Segura e Zebreira
Neiva et al. (2000) +1 other reference
Rwanda
 
  • Western Province
    • Ngororero District
      • Muhororo
Färber (n.d.)
Spain
 
  • Castile and Leon
    • Salamanca
Roda et al. (2001)
      • Garcirrey
Encarnación Roda-Robles (2007)
      • Golpejas-Vega de Tirados
        • Golpejas Mining group
Calvo Rebollar (2015)
USA
 
  • Arizona
    • Cochise County
Graeme (1993) +1 other reference
  • New Hampshire
    • Cheshire County
      • Walpole
P. Cristofono et al. (2011)
    • Grafton County
      • Groton
Rocks & Min. 80:251
Whitmore et al. (2004) +1 other reference
Geological Society of America Abstracts ... +2 other references
    • Sullivan County
      • Newport
King (n.d.)
  • North Carolina
    • Randolph County
      • Staley
Belmont Abbey College Collection
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