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Hannayite (Hannayit)

Collectors Summary

Color gelb
Streak color weiß
Hardness (Mohs) 2.00 - 3.00
Solubility +++ Säuren
Crystal System triklin, P1

Chemism

Chemical formula

(NH4)2Mg3H4(PO4)4·8H2O

Chemical composition

Magnesium, Phosphor, Sauerstoff, Stickstoff, Wasserstoff

Unit weight: 637.0325008 u; Number of atoms in the formula: 61

Info

Empirical formula:

(NH4)2Mg3H4(PO4)4·8H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

4.43

28

45.90

1.0079470

28.2225160
Nitrogen

N

4.40

2

3.28

14.0067200

28.0134400
Oxygen

O

60.28

24

39.34

15.9994300

383.9863200
Magnesium

Mg

11.45

3

4.92

24.3050600

72.9151800
Phosphorus

P

19.45

4

6.56

30.9737612

123.8950448

Strunz 9th edition incl. updates

8.CH.35

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
H: Mit großen und mittelgroßen Kationen, RO4:H2O < 1:1
35:Hannayit-Gruppe

Lapis Classification

VII/C.23-040

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
C: Wasserhaltige Phosphate, ohne fremde Anionen
23: Mittelgroße und große Kationen: Fe-Mn-Zn-Mg und Ca-(NH4) 1+

Classification by Hölzel

8.CD.600

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
D: Phosphates, Valency: 1,2 for large, 2 for medsized Cations
6: With NH4+ Dittmarite-Group

Dana 8th edition

39.03.05.01

39: Hydrated Acid Phosphates, etc
03: Hydrated Acid Phosphates, etc with miscellaneous formulae

IMA status

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

Mineral status

anerkanntes Mineral

Optical Properties

Color

gelb

Streak color

weiß

max. Birefringence

0.035
Birefringence chart\! Hannayite title=Birefringence chart Hannayite

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

1.504

RI value β

1.522

RI value γ / ε

1.539

Ri mean

1.522

2V angle

Biaxial (-) 70°!

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

7.70s

Cell parameters b (Å)

11.51

Cell parameters c (Å)

6.60

Cell parameters a/b or c/a

0.669

Cell parameters c/b

0.573

Cell parameters α

76.0

Cell parameters β

99.80

Cell parameters γ

115.80

Z

1

Volumne (ų)

509.575

X-Ray Powder Diffraction

6.96(100),
5.15(30),
4.64(20),
3.75(20),
3.46(70),
3.29(20),
3.13(10),
3.00(10)
XRD chart Hannayite

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)

2.00 - 3.00

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.03 (gemessen)

2.076 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Australien/Victoria/Corangamite Shire/Skipton/Mt. Widderin/Skipton Caves

Preface

Author (Name, Year)

Ulrich & vom Rath, 1878

References

Handbook of Mineralogy (Anthony et al.), 4 (2000), 234

Other languages

German

Hannayit

Spanish

Hannayita

French

Hannayite

English

Hannayite

Russian

Ганнайит

Simplified Chinese

水磷铵镁石

CNMNC symbol

Symbol

Han

Locations with GPS information