Gormanite Mineral Data

Gormanite Mineral Data +

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General Gormanite Information

Chemical Formula:

Fe++3Al4(PO4)4(OH)6·2(H2O)

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

Empirical Formula:

Fe²⁺₃Al₄(PO₄)₄(OH)₆·2(H₂O)

Environment:

Phosphate ironstones. Forms a series with souzalite.

IMA Status:

Approved IMA 1981

Locality:

Rapid Creek and Big Fish area, Yukon Territory, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Donald Herbert Groman (1922-), University of Toronto, Canada.

Synonym:

IMA1977-030

Gormanite Image

Images:

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

Images:

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

Axial Ratios:

a:b:c =2.3072:1:2.6555

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

Crystal System:

TriclinicSpace Group: P1,P 1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.395(1), 2.554(0.9), 2.925(0.8),

Physical Properties of Gormanite

Cleavage:

[001] Indistinct

Color:

Blue green.

Density:

3.13

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

pale green

Optical Properties of Gormanite

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

Optical Data:

Biaxial (-), a=1.619, b=1.653, g=1.66, bire=0.0410, 2V(Calc)=48, 2V(Meas)=53.

Pleochroism (x):

colorless.

Pleochroism (y):

blue.

Pleochroism (z):

colorless.

Calculated Properties of Gormanite

Electron Density:

r_electron=3.09 gm/cc
note: r_Gormanite=3.13 gm/cc.

Fermion Index

Fermion Index = 0.00471
Boson Index = 0.99529

Photoelectric:

PE_Gormanite= 7.39 barns/electron
U=PE_Gormanite x r_electron= 22.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gormanite is Not Radioactive

Gormanite Classification

Dana Class:

42.9.2.2 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.9)where (A)3 (XO4)2 Zq · x(H2O)

(42.9.2)Dana Group

42.9.2.1 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

42.9.2.2 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

42.9.2.3 Andyrobertsite! KCdCu5(AsO4)4[As(OH)2O2]·2(H2O) P 2₁/m 2/m

42.9.2.4 Calcio-andyrobertsite-1M! KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) P 2₁/m 2/m

42.9.2.5 Calcio-andyrobertsite-2O! KCaCu5(AsO4)4[As(OH)2O2]·2(H2O) P nma 2/m 2/m 2/m

Strunz Class:

VII/D.11-100 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.11 - Strunzite series

VII/D.11-10 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

VII/D.11-20 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

VII/D.11-30 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

VII/D.11-40 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

VII/D.11-50 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12·75(H2O) P 6/mmm 6/m 2/m 2/m

VII/D.11-60 Tinticite Fe5(PO4,VO4)4·7(H2O) P1 1

VII/D.11-70 Beraunite FeFe5(PO4)4(OH)5·4(H2O) C 2/c 2/m

VII/D.11-71 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4·6(H2O) Mono

VII/D.11-90 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-100 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-110 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

VII/D.11-120 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12·4(H2O) C 2/c 2/m

VII/D.11-130 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6·2(H2O) C 2/c 2/m

VII/D.11-135 Ercitite! Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

VII/D.11-140 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11·3(H2O) P 2/c 2/m

VII/D.11-150 Meurigite! KFe7(PO4)5(OH)7·8(H2O) C 2,Cm,C 2/m Mono

Other Gormanite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Gormanite

Fe++3Al4(PO4)4(OH)6·2(H2O)
Dana No: 42.9.2.2 Strunz No: VII/D.11-100
Locality:

Notes: