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Humberstonite (Humberstonit)

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Humberstonit
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Humberstonit
weiße Masse von Humberstonit, Oficina Alemania, Santa Catalina, Antofagasta, Chile; BB < 1 cm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Chile/Antofagasta, Region (II. Region)/Antofagasta, Provinz/Santa Catalina/Oficina Alemania
Mineral: Humberstonite
Image: 1581093229
License: Usage for Mineralienatlas project only
Humberstonit

weiße Masse von Humberstonit, Oficina Alemania, Santa Catalina, Antofagasta, Chile; BB < 1 cm
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-02-07
Locality: Oficina Alemania / Santa Catalina / Antofagasta, Provinz / Antofagasta, Region (II. Region) / Chile

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2.5
Solubility +++ H2O, Säuren, - Azeton, Äthanol
Crystal System trigonal, R3

Chemism

Chemical formula

K3Na7Mg2(SO4)6(NO3)2·6H2O

Chemical composition

Magnesium, Natrium, Kalium, Sauerstoff, Schwefel, Stickstoff, Wasserstoff

Unit weight: 1135.3147254 u; Number of atoms in the formula: 68

Info

Empirical formula:

K3Na7Mg2(SO4)6(NO3)2·6H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.07

12

17.65

1.0079470

12.0953640
Nitrogen

N

2.47

2

2.94

14.0067200

28.0134400
Oxygen

O

50.73

36

52.94

15.9994300

575.9794800
Sodium

Na

14.17

7

10.29

22.9897702

160.9283914
Magnesium

Mg

4.28

2

2.94

24.3050600

48.6101200
Sulfur

S

16.95

6

8.82

32.0655000

192.3930000
Potassium

K

10.33

3

4.41

39.0983100

117.2949300

Analysis wt%

SO3 : 42.99, N2O5 : 9.14, Na2O : 18.43, K2O : 12.17, MgO : 7.47, H2O : 10.18 (Ref: American Mineralogist 70)

Strunz 9th edition incl. updates

7.DG.10

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
D: Sulfate (Selenate, etc.) mit weitere Anionen, mit H2O
G: Mit großen bis mittelgroßen Kationen; mit NO3, CO3, B(OH)4, SiO4 oder IO3
10:Ungemachit-Gruppe

Lapis Classification

VI/D.16-040

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
D: Wasserhaltige Sulfate, mit fremden Anionen
16: Mittelgroße und sehr große Kationen

Classification by Hölzel

7.DO.130

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
D: Sulfates (+Anions +Water)
O: With other complex Anions

Dana 8th edition

32.02.02.01

32: Compound Sulfates
02: Compound Sulfates (hydrous) with simple bi-anionic formula

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.038
Birefringence chart\! Humberstonite title=Birefringence chart Humberstonite

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

1.474

RI value γ / ε

1.436

Ri mean

1.461

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3

Space Group number

148

Space Group

R3

Cell parameters a (Å)

10.900

Cell parameters b (Å)

-

Cell parameters c (Å)

24.410

Cell parameters a/b or c/a

2.239

Cell parameters c/b

-

Z

3

Volumne (ų)

2511.605

X-Ray Powder Diffraction

8.80(30),
8.14(60),
7.47(20),
4.53(30),
4.07(20),
3.39(100),
2.724(70),
2.583(30)
XRD chart Humberstonite

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)

2.5

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.252 (gemessen)

2.252 ( ρ calc. Mineralienatlas )

Instability

+++ H2O, Säuren, - Azeton, Äthanol

(Co-)Type locality

(Co-)Type locality

Chile/Antofagasta, Region (II. Region)/Antofagasta, Provinz/Santa Catalina/Oficina Alemania

Preface

Author (Name, Year)

Ericksen & Fahey & Mrose &1967

References

American Mineralogist 55 (1970), 1518

Other languages

German

Humberstonit

Spanish

Humberstonita

French

Humberstonite

English

Humberstonite

Russian

Хумберстонит

Simplified Chinese

水硝碱镁矾

CNMNC (IMA)-Number

IMA 1967-015

CNMNC symbol

Symbol

Hbe