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Swaknoite (Swaknoit)

Collectors Summary

Color weiß
Streak color weiß
Hardness (Mohs) 1.00 - 2.00
Cleavages möglicherweise {010}
Solubility +++ H2O
Crystal System orthorhombisch,

Chemism

Chemical formula

(NH4)2Ca(PO3OH)2·H2O

Chemical composition

Calcium, Phosphor, Sauerstoff, Stickstoff, Wasserstoff

Unit weight: 286.1295964 u; Number of atoms in the formula: 26

Info

Empirical formula:

(NH4)2Ca(PO3OH)2·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

4.23

12

46.15

1.0079470

12.0953640

Nitrogen

N

9.79

2

7.69

14.0067200

28.0134400

Oxygen

O

50.33

9

34.62

15.9994300

143.9948700

Phosphorus

P

21.65

2

7.69

30.9737612

61.9475224

Calcium

Ca

14.01

1

3.85

40.0784000

40.0784000

Strunz 9th edition incl. updates

8.CJ.10

8: Phosphate, Arsenate, Vanadate
C: Phosphate ohne weitere Anionen, mit H2O
J: Ausschließlich mit großen Kationen
10:Mundrabillait-Gruppe

Lapis Classification

VII/C.23-065

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.CF.420

8: PHOSPHATES ARSENATES VANADATES
C: Phosphates (-Anions +Water)
F: Phosphates, C large, V: 1 to 4
4: Valency: 1+2, V1/V2=4/1 Mundrabillaite-Group

Dana 8th edition

39.03.04.01

39: Hydrated Acid Phosphates, etc
03: Hydrated 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

0.006

Birefringence chart\! Swaknoite title=Birefringence chart Swaknoite

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

1.506

RI value β

1.510

RI value γ / ε

1.512

Ri mean

1.509

2V angle

Biaxial (-) 65°

Crystallography

Crystal System

orthorhombisch

Cell parameters a (Å)

20.959

Cell parameters b (Å)

7.403

Cell parameters c (Å)

6.478

Cell parameters a/b or c/a

2.831

Cell parameters c/b

0.875

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

1005.123

X-Ray Powder Diffraction

10.5(60),
6.99(100),
5.24(20),
4.739(40),
3.994(20),
3.705(90),
3.651(40),
3.177(50)

XRD chart Swaknoite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

1.00 - 2.00

Density (g/cm³)

1.91 (gemessen) 1.89 (berechnet)

1.891 ( ρ calc. Mineralienatlas )

Cleavages

möglicherweise {010}

Tenacity

spröde

Instability

+++ H2O

(Co-)Type locality

(Co-)Type locality

Namibia/Khomas, Region/Windhoek-Land, Kreis/Arnhem Cave

Type material

State Museum, Windhoek, Namibia

Transvaal Museum, Pretoria, Südafrika

Preface

Name from

Von "Suid Wes Afrika Karst Navorsing Organisasie" (SWAKNO), einer speläologisches Exploration-Organisation, deren Mitglieder das Mineral entdeckten.

Author (Name, Year)

Martini, 1991

References

Bulletin of the South African Speleological Society 32 (1991), 72

Other languages

German

Swaknoit

English

Swaknoite

French

Swaknoite

Spanish

Swaknoíta

CNMNC (IMA)-Number

IMA 1991-021

CNMNC symbol

Symbol

Swk

Locations with GPS information

IDs

GUSID (Global unique identifier short form) mM8Cm_s8B0adUlHHnNjkYw
GUID (Global unique identifier) 9B02CF98-3CFB-4607-9D52-51C79CD8E463
Database ID 3710