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Montgomeryite (Montgomeryit)

Pictures (15 Images total)

Montgomeryit
Views (File:
1362323105
): 758
Montgomeryit
Tafelige orangebraune Kristalle, BB = 3,8 mm, Fundort: Tip Top Mine, Fourmile, Custer Distrikt, Custer Co., South Dakota, USA.
Copyright: Bebo; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A001036, Donator: Klaus Fleck
Location: USA/South Dakota/Custer Co./Custer District/Fourmile/Tip Top Mine
Mineral: Montgomeryite
Image: 1362323105
Rating: 8.5 (votes: 2)
License: Usage for Mineralienatlas project only
Montgomeryit (SNr: A001036)

Tafelige orangebraune Kristalle, BB = 3,8 mm, Fundort: Tip Top Mine, Fourmile, Custer Distrikt, Custer Co., South Dakota, USA.
Collection: Lithothek der Münchener Micromounter
Copyright: Bebo
Contribution: Münchener Micromounter 2013-03-03
Locality: Tip Top Mine / Fourmile / Custer District / Custer Co. / South Dakota / USA
Montgomeryit
Views (File:
1404391988
): 789
Montgomeryit
Bildbreite: 3 mm; Fundort: Tip Top Mine, Fourmile, Custer Distrikt, Custer Co., South Dakota, USA
Copyright: Stephan Wolfsried; Contribution: Hg
Location: USA/South Dakota/Custer Co./Custer District/Fourmile/Tip Top Mine
Mineral: Montgomeryite
Image: 1404391988
Rating: 8.5 (votes: 2)
License: Usage for Mineralienatlas project only
Montgomeryit

Bildbreite: 3 mm; Fundort: Tip Top Mine, Fourmile, Custer Distrikt, Custer Co., South Dakota, USA
Copyright: Stephan Wolfsried
Contribution: Hg 2014-07-03
Locality: Tip Top Mine / Fourmile / Custer District / Custer Co. / South Dakota / USA
Montgomeryit
Views (File:
1219742569
): 1050
Montgomeryit
Bildbreite: 2 mm; Fundort: Iron Knob Mine, Whyalla, Middleback Range, Eyre Peninsula, South Australia, Australien
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Australien/South Australia/Eyre Peninsula/Middleback Range/Whyalla/Iron Knob Mine
Mineral: Montgomeryite
Image: 1219742569
Rating: 7.67 (votes: 3)
License: Usage for Mineralienatlas project only
Montgomeryit

Bildbreite: 2 mm; Fundort: Iron Knob Mine, Whyalla, Middleback Range, Eyre Peninsula, South Australia, Australien
Copyright: Stephan Wolfsried
Contribution: Hg 2008-08-26
Locality: Iron Knob Mine / Whyalla / Middleback Range / Eyre Peninsula / South Australia / Australien
Montgomeryit
Views (File:
1404391951
): 447
Montgomeryit
Bildbreite: 2,5 mm; Fundort: Tip Top Mine, Fourmile, Custer Distrikt, Custer Co., South Dakota, USA
Copyright: Stephan Wolfsried; Contribution: Hg
Location: USA/South Dakota/Custer Co./Custer District/Fourmile/Tip Top Mine
Mineral: Montgomeryite
Image: 1404391951
Rating: 7.67 (votes: 3)
License: Usage for Mineralienatlas project only
Montgomeryit

Bildbreite: 2,5 mm; Fundort: Tip Top Mine, Fourmile, Custer Distrikt, Custer Co., South Dakota, USA
Copyright: Stephan Wolfsried
Contribution: Hg 2014-07-03
Locality: Tip Top Mine / Fourmile / Custer District / Custer Co. / South Dakota / USA
Montgomeryit
Views (File:
1219742635
): 1126
Montgomeryit
Bildbreite: 2 mm; Fundort: Iron Knob Mine, Whyalla, Middleback Range, Eyre Peninsula, South Australia, Australien
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Australien/South Australia/Eyre Peninsula/Middleback Range/Whyalla/Iron Knob Mine
Mineral: Montgomeryite
Image: 1219742635
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Montgomeryit

Bildbreite: 2 mm; Fundort: Iron Knob Mine, Whyalla, Middleback Range, Eyre Peninsula, South Australia, Australien
Copyright: Stephan Wolfsried
Contribution: Hg 2008-08-26
Locality: Iron Knob Mine / Whyalla / Middleback Range / Eyre Peninsula / South Australia / Australien
Montgomeryit
Views (File:
1233150323
): 786
Montgomeryit
Bildbreite: 2 mm; Fundort: Tip Top Mine, Fourmile, Custer Distrikt, Custer Co., South Dakota, USA
Copyright: Stephan Wolfsried; Contribution: Hg
Location: USA/South Dakota/Custer Co./Custer District/Fourmile/Tip Top Mine
Mineral: Montgomeryite
Image: 1233150323
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Montgomeryit

Bildbreite: 2 mm; Fundort: Tip Top Mine, Fourmile, Custer Distrikt, Custer Co., South Dakota, USA
Copyright: Stephan Wolfsried
Contribution: Hg 2009-01-28
Locality: Tip Top Mine / Fourmile / Custer District / Custer Co. / South Dakota / USA

You find additional Montgomeryit specimen at the Geolitho Museum

Collectors Summary

Color farblos, gelblich, weiß, grün, rot
Streak color weiß
Hardness (Mohs) 4
Solubility +++ Säuren
Crystal System monoklin, C2

Chemism

Chemical formula

Ca4MgAl4(PO4)6(OH)4·12H2O

Chemical composition

Aluminium, Calcium, Magnesium, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 1146.587096 u; Number of atoms in the formula: 83

Info

Empirical formula:

Ca4MgAl4(PO4)6(OH)4·12H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

2.46

28

33.73

1.0079470

28.2225160
Oxygen

O

55.82

40

48.19

15.9994300

639.9772000
Magnesium

Mg

2.12

1

1.20

24.3050600

24.3050600
Aluminium

Al

9.41

4

4.82

26.9815382

107.9261528
Phosphorus

P

16.21

6

7.23

30.9737612

185.8425672
Calcium

Ca

13.98

4

4.82

40.0784000

160.3136000

Analysis wt%

CaO : 19.56, Al2O3 : 17.79, MgO : 3.52, P2O5 : 37.14, H2O : 22.00 (Ref: berechnet)

Strunz 9th edition incl. updates

8.DH.25

8: Phosphate, Arsenate, Vanadate
D: Phosphate, mit weiteren Anionen, mit H2O
H: Mit großen und mittelgroßen [Kationen], (OH, etc.):RO4 < 1:1
25:Montgomeryit-Gruppe

Lapis Classification

VII/D.31-010

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
D: Wasserhaltige Phosphate, mit fremden Anionen
31: Mittelgroße und sehr große Kationen: Al-Mg und Ca-Na-K; Montgomeryit-Gruppe

Classification by Hölzel

8.DL.300

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
L: very large=2, very small-medium=2+3
3: Montgomeryite-Group

Dana 8th edition

42.11.08.01

42: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
11: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where (AB)4 (XO4)3 Zq · x(H2O)
08: Montgomeryite group

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Calcioferrite group  ⇒ Montgomeryite subgroup

Optical Properties

Color

farblos, gelblich, weiß, grün, rot

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

0.010
Birefringence chart\! Montgomeryite title=Birefringence chart Montgomeryite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.572

RI value β

1.578

RI value γ / ε

1.582

Ri mean

1.577

2V angle

Biaxial (-) 75°

Crystallography

Crystal System

monoklin

Class (H-M)

2

Space Group number

5

Space Group

C2

Cell parameters a (Å)

10.023

Cell parameters b (Å)

24.121

Cell parameters c (Å)

6.243

Cell parameters a/b or c/a

0.416

Cell parameters c/b

0.259

Cell parameters α

90°

Cell parameters β

91.55

Cell parameters γ

90°

Z

2

Volumne (ų)

1508.785

X-Ray Powder Diffraction

12.0(90),
5.53(20),
5.09(100),
4.35(20),
2.952(20),
2.882(50),
2.605(40),
2.572(20)
XRD chart Montgomeryite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4

VHN (Hardness Vickers)

190 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.46 - 2.53 / Durchschnittlich = 2.49

2.524 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

USA/Utah/Utah Co./Oquirrh Mts./Fairfield/Clay Canyon/Little Green Monster Variscite Mine

Preface

Author (Name, Year)

Larsen, 1940

References

Handbook of Mineralogy (Anthony et al.), 4 (2000), 387

IMA group assignments

Other languages

German

Montgomeryit

English

Montgomeryite

French

Montgomeryite

Spanish

Montgomeryíta

Russian

Монтгомериит

CNMNC symbol

Symbol

Mgm

Locations with GPS information