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Archerite

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Archerit
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Archerit
massiges Aggregat von Archerit, vermutlich mit Leimüberzug, Cocklebiddy Cave, Cocklebiddy Roadhouse, Dundas Shire, Western Australia, Australien; BB ~ 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Australien/Western Australia/Dundas Shire
Mineral: Archerite
Image: 1585472434
License: Usage for Mineralienatlas project only
Archerit

massiges Aggregat von Archerit, vermutlich mit Leimüberzug, Cocklebiddy Cave, Cocklebiddy Roadhouse, Dundas Shire, Western Australia, Australien; BB 1 mm, analysiert

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-03-29
Locality: Dundas Shire / Western Australia / Australien

Collectors Summary

Color weiß
Streak color weiß
Hardness (Mohs) 2
Solubility +++ H2O
Crystal System tetragonal, I42d
Morphology Prismen und Pyramiden 2. Stellung

Chemism

Chemical formula

(K,NH4)H2PO4

Chemical composition

Kalium, Phosphor, Sauerstoff, Stickstoff, Wasserstoff

Unit weight: 130.8207347 u; Number of atoms in the formula: 9

Info

Empirical formula:

(K0.75(NH4)0.25)H2PO4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.31

3

33.33

1.0079470

3.0238410

Nitrogen

N

2.68

0.25

2.78

14.0067200

3.5016800

Oxygen

O

48.92

4

44.44

15.9994300

63.9977200

Phosphorus

P

23.68

1

11.11

30.9737612

30.9737612

Potassium

K

22.42

0.75

8.33

39.0983100

29.3237325

Strunz 9th edition incl. updates

8.AD.15

8: Phosphate, Arsenate, Vanadate
A: Phosphate, etc., ohne weitere Anionen, ohne H2O
D: Mit ausschließlich großen [Kationen]
15:Biphosphammit-Gruppe

Lapis Classification

VII/A.12-050

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
A: Wasserfreie Phosphate [PO4] 3-, ohne fremde Anionen
12: Sehr große Kationen: Ca-Na-K, SE, Bi u.a.

Classification by Hölzel

8.AD.200

8: PHOSPHATES ARSENATES VANADATES
A: Phosphates (-anions -water)
D: Phosphates, C large

Dana 8th edition

37.01.04.02

37: Phosphate Minerals
01: Anhydrous Acid Phosphates, etc with miscellaneous formulae

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

weiß

Streak color

weiß

max. Birefringence

0.043

Birefringence chart\! Archerite title=Birefringence chart Archerite

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

1.513

RI value γ / ε

1.470

Ri mean

1.499

2V angle

Uniaxial (-)

Crystallography

Crystal System

tetragonal

Class (H-M)

42m

Space Group number

122

Space Group

I42d

Cell parameters a (Å)

7.45

Cell parameters b (Å)

-

Cell parameters c (Å)

6.98

Cell parameters a/b or c/a

0.937

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

387.407

X-Ray Powder Diffraction

5.086(10),
3.724(100),
3.008(10),
2.908(80),
2.635(20),
2.340(10),
1.982(10),
1.953(50)

XRD chart Archerite

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

Morphology

Prismen und Pyramiden 2. Stellung

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

2

VHN (Hardness Vickers)

32 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.23 (gemessen)

2.243 ( ρ calc. Mineralienatlas )

Instability

+++ H2O

Preface

Name from

Ehrt Dr. Michael Archer (1945 -), Kurator der Säugetiere, Queensland Museum, Brisbane, Australien, der die ersten Exemplare 1969 entdeckte.

Author (Name, Year)

Bridge, 1977

References

Mineralogical Magazine 41 (1977), 33

Other languages

German

Archerit

Spanish

Archerita

French

Archerite

English

Archerite

Russian

Арчерит

CNMNC (IMA)-Number

IMA 1975-008

CNMNC symbol

Symbol

Aht

Locations with GPS information

IDs

GUSID (Global unique identifier short form) ONLX6ns9tUCDvUg0s4iXdw
GUID (Global unique identifier) EAD7D238-3D7B-40B5-83BD-4834B3889777
Database ID 167