Gabrielsonite Mineral Data

Gabrielsonite Mineral Data +

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General Gabrielsonite Information

Chemical Formula:

PbFe++(AsO4)(OH)

Composition:

Molecular Weight = 418.97 gm

Iron 13.33 % Fe 17.15 % FeO

Arsenic 17.88 % As 27.43 % As₂O₅

Hydrogen 0.24 % H 2.15 % H₂O

Lead 49.45 % Pb 53.27 % PbO

Oxygen 19.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbFe²⁺(AsO₄)(OH)

Environment:

Secondary arsenate mineral.

IMA Status:

Approved IMA 1967

Locality:

Hindenburg stope at Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Olof Erik Gabrielson (1912-), mineralogist, Swedish Natural History Museum, Stockholm, Sweden.

Gabrielsonite Image

Images:

Gabrielsonite

Comments: Jet black, lustrous crystal grain, showing no faces, fractured to about 0.75mm with white pectolite-hematite matrix.
Location: Langban, Varmland, Sweden. Scale: 2.5 x 1.5 x 1.5cm.
© Tom Loomis / Dakota Matrix

Gabrielsonite Crystallography

Axial Ratios:

a:b:c =0.9118:1:0.6937

Cell Dimensions:

a = 7.86, b = 8.62, c = 5.98, Z = 4; V = 405.16 Den(Calc)= 6.87

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P 2₁m

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

By Intensity(I/I_o): 3.074(1), 3.192(1), 2.706(0.4),

Physical Properties of Gabrielsonite

Cleavage:

None

Color:

Greenish brown, Black.

Density:

6.67

Diaphaniety:

Transparent to Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3.5 - Copper Penny

Luster:

Adamantine

Streak:

light brown

Optical Properties of Gabrielsonite

Optical Data:

NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.1548) where Ncalc=Dcalc*KC+1
NCalc= 2.03 - from Gladstone-Dale relationship (KC = 0.1548) where Ncalc=Dmeas*KC+1

Calculated Properties of Gabrielsonite

Electron Density:

r_electron=5.97 gm/cc
note: r_{Gabrielsonite}=6.87 gm/cc.

Fermion Index

Fermion Index = 0.11221
Boson Index = 0.88779

Photoelectric:

PE_{Gabrielsonite}= 891.61 barns/electron
U=PE_{Gabrielsonite} x r_electron=5,321.63 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gabrielsonite is Not Radioactive

Gabrielsonite Classification

Dana Class:

41.5.1.5 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.1)Dana Group

41.5.1.1 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.2 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.3 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.4 Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.5 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

41.5.1.6 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.7 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.8 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.9 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.5.1.10 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/B.26-70 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.26 - Adelite - Duftite group

VII/B.26-10 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-15 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-20 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-30 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-40 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-50 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-60 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-70 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

VII/B.26-80 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-80* Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

Other Gabrielsonite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Gabrielsonite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Gabrielsonite

PbFe++(AsO4)(OH)
Dana No: 41.5.1.5 Strunz No: VII/B.26-70
Locality:

Notes: