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Georgerobinsonite

Collectors Summary

Color orangerot
Streak color blass rot
Lustre Diamantglanz
Hardness (Mohs) 2.5 - 3
Cleavages keine Spaltbarkeit oder Teilbarkeit beobachtet
Fracture uneben
Crystal System orthorhombisch, Pmmn
Morphology Kristalle kleiner als 0.1 mm im Durchschnitt mit {001} dominant und kleiner {010} und {110}

Chemism

Chemical formula

Pb4(CrO4)2(OH)2FCl

Chemical composition

Blei, Chlor, Chrom, Fluor, Sauerstoff, Wasserstoff

Unit weight: 1149.29411725 u; Number of atoms in the formula: 20

Info

Empirical formula:

Pb4(CrO4)2(OH)2FCl

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.18

2

10.00

1.0079470

2.0158940

Oxygen

O

13.92

10

50.00

15.9994300

159.9943000

Fluorine

F

1.65

1

5.00

18.9984033

18.9984033

Chlorine

Cl

3.08

1

5.00

35.4532000

35.4532000

Chromium

Cr

9.05

2

10.00

51.9961600

103.9923200

Lead

Pb

72.12

4

20.00

207.2100000

828.8400000

Lapis Classification

VI/F.02-045

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
F: Chromate [CrO4] 2-

Classification by Hölzel

7.FB.280

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
F: Chromates
B: Chromates (+Anions -Water)

IMA status

anerkannt, IMA Web-Seite - Neue Mineralien Nov. 2009

Mineral status

anerkanntes Mineral

Optical Properties

Color

orangerot

Streak color

blass rot

Diaphaneity (Transparency)

transparent

Lustre

Diamantglanz

RI value α / ω / n

α = 2.07

RI value β

β > 2.11

RI value γ / ε

γ > 2.11

2V angle

84(2)° (gemessen)

Orientation

X = a, Y = c und Z = b

Dispersion

stark, r > v

Pleochroism

stark pleochroisch, α orange, gelb γ

Optical Data Luminescence

Luminescence

keine Fluoreszenz unter UV

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

59

Space Group

Pmmn

Cell parameters a (Å)

7.626

Cell parameters b (Å)

11.608

Cell parameters c (Å)

6.896

Cell parameters a/b or c/a

0.657

Cell parameters c/b

0.594

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volumne (ų)

610.452

Kristall structure

Struktur bestimmt

X-Ray Powder Diffraction

6.371(60), 3.357(60), 3.308(80), 3.195(80), 3.143(60), 2.131(100)

XRD chart Georgerobinsonite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

Kristalle kleiner als 0.1 mm im Durchschnitt mit {001} dominant und kleiner {010} und {110}

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.5 - 3

Density (g/cm³)

6.253 (berechnet)

6.252 ( ρ calc. Mineralienatlas )

Cleavages

keine Spaltbarkeit oder Teilbarkeit beobachtet

Fracture

uneben

Tenacity

spröde

Associations

Caledonit, einem Cerchiarait verwandtem Mineral, Cerussit, Diaboleit, Cr-haltigem Leadhillit, Matlockit, Murdochit, Pinalit, Wulfenit und Yedlinit

Name from

Zu Ehren von Dr. George Robinson, Professor für Mineralogie an der Michigan Tech und Kurator der AE Seaman Mineral Museum benannt.

Author (Name, Year)

Frank C. Hawthorne, 2009

References

Neue Mineralien - IMA Web-Seite November 2009

Mark A. Cooper, Neil A. Ball, Frank C. Hawthorne, Werner H. Paar, Andrew C. Roberts, and Elizabeth Moffatt - Georgerobinsonite, Pb4(CrO4)2(OH)2FCl, a new chromate mineral from the Mammoth – St. Anthony Mine, Tiger, Pinal County, Arizona: Description and crystal structure - Canadian Mineralogist (2011) 49, 865-876

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Wattersite

Hg41+Hg2+Cr6+O6

monoklin : 2/m : C2/c

VI/F.02-003

Edoylerite

Hg32+Cr6+O4S2

monoklin : 2/m : P21/c

VI/F.02-005

Deanesmithite

Hg+2Hg2+3[S2|O|CrO4]

triklin : 1 : P1

VI/F.02-007

Vauquelinite

Pb2Cu(CrO4)(PO4)(OH)

monoklin : 2/m : P21/n

VI/F.02-010

Fornacite

(Pb,Cu)3[(Cr,As)O4]2(OH)

monoklin : 2/m : P21/c

VI/F.02-020

Molybdofornacite

Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH)

monoklin : 2/m : P21/c

VI/F.02-030

Phoenicochroite

Pb2(CrO4)O

monoklin : 2/m : C2/m

VI/F.02-040

Georgerobinsonite

Pb4(CrO4)2(OH)2FCl

orthorhombisch : mmm : Pmmn

VI/F.02-045

Reynoldsite

Pb2Mn4+2O5(CrO4)

triklin : 1 : P1

VI/F.02-048

Santanaite

Pb11CrO16

hexagonal : 622 : P6322

VI/F.02-050

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Vauquelinite

Pb2Cu(CrO4)(PO4)(OH)

monoklin : 2/m : P21/n

7.FB.200

Fornacite

(Pb,Cu)3[(Cr,As)O4]2(OH)

monoklin : 2/m : P21/c

7.FB.220

Molybdofornacite

Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH)

monoklin : 2/m : P21/c

7.FB.240

Hemihedrite

ZnPb10(CrO4)6(SiO4)2(OH)2

triklin : 1, 1 : P1, P1

7.FB.260

Iranite

Pb10Cu(CrO4)6(SiO4)2(F,OH)2

triklin : 1, 1 : P1, P1

7.FB.270

Georgerobinsonite

Pb4(CrO4)2(OH)2FCl

orthorhombisch : mmm : Pmmn

7.FB.280

Other languages

German

Georgerobinsonit

Spanish

Georgerobinsonita

English

Georgerobinsonite

French

Georgerobinsonite

Russian

Джорджробинсонит

IMA Number

IMA 2009-068

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Georgerobinsonit
Google-Bilder-Suche - search for: Georgerobinsonit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Georgerobinsonit

English pages

Mindat - search for: Georgerobinsonite
Webmineral - search for: Georgerobinsonite
Handbook-of-Mineralogy - search for: Georgerobinsonite
RRUFF Database-of-Raman-spectroscopy - search for: Georgerobinsonite
American-Mineralogist-Crystal-Structure-Database - search for: Georgerobinsonite
Athena - search for: Georgerobinsonite

Russian pages

Webmineral.ru - search for: Джорджробинсонит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Georgerobinsonit
Crystal-Treasure.com - search for: Georgerobinsonit
Bosse - search for: Georgerobinsonit



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