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Esperanzaite (Esperanzait)

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Esperanzait
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Esperanzait
blauer Esperanzait, Mina La Esperanza, Madero, Durango, Mexiko; BB < 1 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Mexiko/Durango/Madero/Mina La Esperanza
Mineral: Esperanzaite
Image: 1578840376
License: Usage for Mineralienatlas project only
Esperanzait

blauer Esperanzait, Mina La Esperanza, Madero, Durango, Mexiko; BB < 1 mm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-01-12
Locality: Mina La Esperanza / Madero / Durango / Mexiko

Collectors Summary

Color blau grün
Streak color weiß
Hardness (Mohs) 4.5
Cleavages vollkommen parallel zu {001}, kein Bruch
Fracture nicht genannt
Crystal System monoklin, P21/m

Chemism

Chemical formula

NaCa2Al2[F2|OH|(AsO4)2]·2H2O

Chemical composition

Aluminium, Arsen, Calcium, Natrium, Fluor, Sauerstoff, Wasserstoff

Unit weight: 525.9831221 u; Number of atoms in the formula: 25

Info

Empirical formula:

NaCa2Al2[F2OH(AsO4)2]·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.96

5

20.00

1.0079470

5.0397350

Oxygen

O

33.46

11

44.00

15.9994300

175.9937300

Fluorine

F

7.22

2

8.00

18.9984033

37.9968065

Sodium

Na

4.37

1

4.00

22.9897702

22.9897702

Aluminium

Al

10.26

2

8.00

26.9815382

53.9630764

Calcium

Ca

15.24

2

8.00

40.0784000

80.1568000

Arsenic

As

28.49

2

8.00

74.9216020

149.8432040

Analysis wt%

As2O5 : 40.65, Al2O3 : 19.20, ZnO : 0.87, CaO : 20.75, Na2O : 3.86, F : 13.90, H2O : 8.65 (Ref: Canadian Mineralogist 99)

Strunz 9th edition incl. updates

8.DM.05

8: Phosphate, Arsenate, Vanadate
D: Phosphate, mit weiteren Anionen, mit H2O
M: Mit großen und mittelgroßen [Kationen], (OH, etc.):RO4 > 2:1
05:Morinit-Gruppe

Lapis Classification

VII/D.25-038

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

Classification by Hölzel

8.DJ.365

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
J: Lavendulan-Group

Dana 8th edition

42.04.02.02

42: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
04: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where (AB)5 (XO4)2 Zq · x(H2O)
02: Morinite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

blau grün

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

0.013

Birefringence chart\! Esperanzaite title=Birefringence chart Esperanzaite

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

1.580

RI value β

1.588

RI value γ / ε

1.593

Ri mean

1.587

2V angle

Biaxial (-) 76°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

11

Space Group

P21/m

Cell parameters a (Å)

9.687

Cell parameters b (Å)

10.738

Cell parameters c (Å)

5.552

Cell parameters a/b or c/a

0.902

Cell parameters c/b

0.517

Cell parameters α

90°

Cell parameters β

105.32

Cell parameters γ

90°

Z

2

Volume (ų)

556.992

X-Ray Powder Diffraction

9.34(40),
5.355(80),
4.792(80),
3.791(80),
3.524(90),
2.964(100),
2.707(90),
2.245(60)

XRD chart Esperanzaite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.5

VHN (Hardness Vickers)

280 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.24

3.136 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen parallel zu {001}, kein Bruch

Fracture

nicht genannt

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Mexiko/Durango/Madero/Mina La Esperanza

Preface

Author (Name, Year)

Foord & Hughes & Cureton & Maxwell & Falster & Sommer & Hlava, 1999

References

Canadian Mineralogist 37 (1999), 67

Other languages

German

Esperanzait

English

Esperanzaite

French

Esperanzaite

Spanish

Esperanzaíta

Russian

Эсперансаит

CNMNC (IMA)-Number

IMA 1998-025

CNMNC symbol

Symbol

Epz

IDs

GUSID (Global unique identifier short form) 45IaCGnOPUOavkFQnoofDA
GUID (Global unique identifier) 081A92E3-CE69-433D-9ABE-41509E8A1F0C
Database ID 1063