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Maxwellite

Pictures (2 Images total)

Maxwellit
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Maxwellit
Bildbreite: 3 mm; Fundort: Squaw Creek Mine, Taylor Creek Tin District, Sierra Co., New Mexico, USA
Copyright: Stephan Wolfsried; Contribution: Hg
Location: USA/New Mexico/Catron Co./Taylor Creek District/Squaw Creek Mine
Mineral: Maxwellite
Image: 1167315684
Rating: 7.67 (votes: 3)
License: Usage for Mineralienatlas project only
Maxwellit

Bildbreite: 3 mm; Fundort: Squaw Creek Mine, Taylor Creek Tin District, Sierra Co., New Mexico, USA
Copyright: Stephan Wolfsried
Contribution: Hg 2006-12-28
Locality: Squaw Creek Mine / Taylor Creek District / Catron Co. / New Mexico / USA
Maxwellit
Views (File:
1370110460
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Maxwellit
Blockige rote Kristall, BB = 1 mm, Fundort: Squaw Creek Mine, Taylor Creek Tin District, Sierra Co., New Mexico, USA.
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A001259, Donator: Klaus Fleck
Location: USA/New Mexico/Catron Co./Taylor Creek District/Squaw Creek Mine
Mineral: Maxwellite
Image: 1370110460
License: Usage for Mineralienatlas project only
Maxwellit (SNr: A001259)

Blockige rote Kristall, BB = 1 mm, Fundort: Squaw Creek Mine, Taylor Creek Tin District, Sierra Co., New Mexico, USA.
Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2013-06-01
Locality: Squaw Creek Mine / Taylor Creek District / Catron Co. / New Mexico / USA

You find additional specimen at the Geolitho Museum

Collectors Summary

Color dunkelrot
Streak color rotorange
Hardness (Mohs) 5.00 - 5.50
Cleavages gut {110}
Fracture unregelmäßig bis muschelig
Solubility +++ Säuren
Crystal System monoklin, C2/c

Chemism

Chemical formula

(Na,Ca)(Fe3+,Al,Mg)(AsO4)(F,O)

Chemical composition

Aluminium, Arsen, Calcium, Eisen, Magnesium, Natrium, Fluor, Sauerstoff

Unit weight: 228.4619970475 u; Number of atoms in the formula: 8

Info

Empirical formula:

(Na0.75Ca0.25)(Fe0.6Al0.3Mg0.1)(AsO4)(F0.75O0.25)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

29.76

4.25

53.13

15.9994300

67.9975775
Fluorine

F

6.24

0.75

9.38

18.9984033

14.2488024
Sodium

Na

7.55

0.75

9.38

22.9897702

17.2423277
Magnesium

Mg

1.06

0.1

1.25

24.3050600

2.4305060
Aluminium

Al

3.54

0.3

3.75

26.9815382

8.0944615
Calcium

Ca

4.39

0.25

3.13

40.0784000

10.0196000
Iron

Fe

14.67

0.6

7.50

55.8452000

33.5071200
Arsenic

As

32.79

1

12.50

74.9216020

74.9216020

Analysis wt%

Ø Na2O : 8.00, CaO : 8.00, Fe2O3 : 14.00, MgO : 3.50, Al2O3 : 5.00, TiO2 : 5.00, Mn2O3 : 0.50, SnO2 : 0.60, As2O5 : 51.00, F : 6.00 (Ref: Neues Jahrbuch für Mineralogie, (Monatshefte) 91)

Strunz 9th edition incl. updates

8.BH.10

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
H: Mit mittelgroßen und meist großen [Kationen] (OH, etc.):RO4 = 1:1
10:Tilasit-Gruppe

Lapis Classification

VII/B.25-055

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
B: Wasserfreie Phosphate, mit fremden Anionen F,Cl,O,OH
25: Mittelgroße und große Kationen: Mg-Cu-Zn und Ca-Na-K-Ba-Pb

Classification by Hölzel

8.BI.230

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
I: Phosphates, very large: 1, Vmed: 2 or 3
2: Phosphates, very large: 1, Vmed: 3 Lacroixite-Brazilianite-Group

Dana 8th edition

41.05.05.03

41: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
05: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen where (A B)2 (XO4) Zq
05: Lacroixite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Tilasite-Durangite group

Optical Properties

Color

dunkelrot

Streak color

rotorange

max. Birefringence

0.050
Birefringence chart\! Maxwellite title=Birefringence chart Maxwellite

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

1.748

RI value β

1.772

RI value γ / ε

1.798

Ri mean

1.773

2V angle

Biaxial (+) 86°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

6.687

Cell parameters b (Å)

8.780

Cell parameters c (Å)

7.134

Cell parameters a/b or c/a

0.762

Cell parameters c/b

0.813

Cell parameters α

90°

Cell parameters β

114.58

Cell parameters γ

90°

Z

4

Volume (ų)

380.895

X-Ray Powder Diffraction

4.844(70),
3.642(30),
3.437(30),
3.290(100),
3.039(70),
2.906(30),
2.637(50),
2.614(80)
XRD chart Maxwellite

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)

5.00 - 5.50

VHN (Hardness Vickers)

470 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.90 (gemessen)

3.984 ( ρ calc. Mineralienatlas )

Cleavages

gut {110}

Fracture

unregelmäßig bis muschelig

Tenacity

wahrscheinlich spröde

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

USA/New Mexico/Catron Co./Taylor Creek District/Squaw Creek Mine

Preface

Author (Name, Year)

Foord & Hlava & Fitzpatrick & Erd & Hinton, 1991

References

Neues Jahrbuch für Mineralogie, Monatshefte (1991), 363

IMA group assignments

Other languages

German

Maxwellit

Spanish

Maxwellita

English

Maxwellite

French

Maxwellite

Russian

Максуэллит

Japanese

ﾏｯｸｽｳｪﾙ石

CNMNC (IMA)-Number

IMA 1987-044

CNMNC symbol

Symbol

Max

IDs

GUSID (Global unique identifier short form) zOKvtJ2iwEeqjneTjQbHaA
GUID (Global unique identifier) B4AFE2CC-A29D-47C0-AA8E-77938D06C768
Database ID 2422