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Montgomeryite (Montgomeryit)

Pictures (18 Images total)

Montgomeryit
Views (File:
1362323105
): 864
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 County/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 County / South Dakota / USA
Montgomeryit
Views (File:
1404391988
): 877
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 County/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 County / South Dakota / USA
Montgomeryit
Views (File:
1219742569
): 1121
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
): 492
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 County/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 County / South Dakota / USA
Montgomeryit
Views (File:
1219742635
): 1180
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

You find additional 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

Volume (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 County/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

IDs

GUSID (Global unique identifier short form) 2VC3wHN9akGK1jxqj_Puag
GUID (Global unique identifier) C0B750D9-7D73-416A-8AD6-3C6A8FF3EE6A
Database ID 2591