Mineralogy Database

Gormanite Mineral Data

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General Gormanite Information

Help on Chemical  Formula: Chemical Formula: Fe++3Al4(PO4)4(OH)6•2(H2O)
Help on Composition: Composition: Molecular Weight = 793.43 gm
   Aluminum    13.60 %  Al   25.70 % Al2O3
   Iron        21.12 %  Fe   27.17 % FeO
   Phosphorus  15.62 %  P    35.78 % P2O5
   Hydrogen     1.27 %  H    11.35 % H2O
   Oxygen      48.40 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+3Al4(PO4)4(OH)6•2(H2O)
Help on Environment: Environment: Phosphate ironstones. Forms a series with souzalite.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Rapid Creek and Big Fish area, Yukon Territory, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Donald Herbert Groman (1922-), University of Toronto, Canada.
Help on Name Pronunciation: Name Pronunciation: Gormanite + Pronunciation Say GORMANITE
Help on Synonym: Synonym: IMA1977-030
 

Gormanite Image

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  Gormanite

Comments: Elongated, dark bluish green, fibrous crystals of gormanite and quartz on a matrix of quartz and water clear apatite crystals.
Location: Big Fish River, Yukon Territory, Canada. Scale: 4.8 x 3.8 cm.
© John Veevaert

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  Gormanite

Comments: Dark green, velvety mass of gormanite crystals on matrix.
Location: Rapid Creek, Yukon Territory, Canada. Scale: 3 x 4.5 cm.
© Dave Barthelmy

Gormanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.3072:1:2.6555
Help on Cell Dimensions: Cell Dimensions: a = 11.79, b = 5.11, c = 13.57, Z = 2; alpha = 90.83°, beta = 99.25°, gamma = 90.082° V = 806.83 Den(Calc)= 3.27
Help on Crystal System: Crystal System: Triclinic Space Group: P1,P 1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.395(1), 2.554(0.9), 2.925(0.8),
 

Physical Properties of Gormanite

Help on Cleavage: Cleavage: {001} Indistinct
Help on Color: Color: Blue green.
Help on Density: Density: 3.13
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pale green
 

Optical Properties of Gormanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1969,KPDmeas= 0.2058,KC= 0.2084
Ncalc = 1.65 - 1.68
Help on Optical Data: Optical Data: Biaxial (-), a=1.619, b=1.653, g=1.66, bire=0.0410, 2V(Calc)=48, 2V(Meas)=53.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): blue.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Gormanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Gormanite =3.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0047108218
Boson Index = 0.9952891782
Help on Photoelectric: Photoelectric: PEGormanite = 7.39 barns/electron
U=PEGormanite x rElectron Density= 22.85 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gormanite is Not Radioactive
 

Gormanite Classification

Help on  Dana Class: Dana Class: 42.09.02.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.09)where (A)3 (XO4)2 Zq � x(H2O)
  (42.09.02)Souzalite Group
 
42.09.02.01 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6•2(H2O) P1,P 1 Tri
 
42.09.02.02 Gormanite Fe3Al4(PO4)4(OH)6•2(H2O) P1,P 1 Tri
 
42.09.02.03 Andyrobertsite! KCdCu5(AsO4)4[As(OH)2O2]•2(H2O) P 21/m 2/m
 
42.09.02.04 Calcioandyrobertsite-1M! KCaCu5(AsO4)4[As(OH)2O2]•2(H2O) P 21/m 2/m
 
42.09.02.05 Calcioandyrobertsite-2O! KCaCu5(AsO4)4[As(OH)2O2]•2(H2O) P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.DC.45 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
 
08.DC.45 Gormanite Fe3Al4(PO4)4(OH)6•2(H2O) P1,P 1 Tri
 
08.DC.45 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6•2(H2O) P1,P 1 Tri
 

Other Gormanite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Gormanite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Print or Cut-and-Paste your Gormanite Specimen Label here :

Gormanite

Fe++3Al4(PO4)4(OH)6•2(H2O)
Dana No: 42.09.02.02 Strunz No: 08.DC.45
Locality:

 

Notes:

 

 
   
 


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