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Dawsonite (Dawsonit)

Pictures (34 Images total)

Dawsonit
Views (File:
1321436589
): 2780, Rating: 9.33
Dawsonit
Größe: 1,2 mm; Fundort: Santa Fiora, Monte Amiata, Grosseto, Provinz, Toskana (Toscana), Italien
Copyright: Enrico Bonacina; Contribution: Hg
Location: Italien/Toskana (Toscana)/Grosseto, Provinz/Monte Amiata/Santa Fiora
Mineral: Dawsonite
Image: 1321436589
Rating: 9.33 (votes: 6)
License: Usage for Mineralienatlas project only
Dawsonit

Größe: 1,2 mm; Fundort: Santa Fiora, Monte Amiata, Grosseto, Provinz, Toskana (Toscana), Italien
Copyright: Enrico Bonacina
Contribution: Hg 2011-11-16
Locality: Santa Fiora / Monte Amiata / Grosseto, Provinz / Toskana (Toscana) / Italien
Dawsonit
Views (File:
1277329244
): 2006
Dawsonit
Bildbreite: 0,6 mm, Fundort: Francon quarry, St. Michel District, Montréal, Jacques Cartier Co., Québec, Kanada
Copyright: Luigi Mattei; Contribution: thdun5
Location: Kanada/Québec/Montréal, Region/Montréal/St. Michel District/Francon Quarry
Mineral: Dawsonite
Image: 1277329244
Rating: 8.5 (votes: 2)
License: Usage for Mineralienatlas project only
Dawsonit

Bildbreite: 0,6 mm, Fundort: Francon quarry, St. Michel District, Montréal, Jacques Cartier Co., Québec, Kanada
Copyright: Luigi Mattei
Contribution: thdun5 2010-06-23
Locality: Francon Quarry / St. Michel District / Montréal / Montréal, Region / Québec / Kanada
Dawsonit
Views (File:
1298212963
): 1576
Dawsonit
Größe: 2 mm; Fundort: Tolfa, Tolfaberge (Monti della Tolfa), Rom, Provinz, Latium (Lazio), Region, Italien
Copyright: Enrico Bonacina; Contribution: Hg
Location: Italien/Latium (Lazio), Region/Rom, Provinz/Tolfa
Mineral: Dawsonite
Image: 1298212963
Rating: 8.5 (votes: 2)
License: Usage for Mineralienatlas project only
Dawsonit

Größe: 2 mm; Fundort: Tolfa, Tolfaberge (Monti della Tolfa), Rom, Provinz, Latium (Lazio), Region, Italien
Copyright: Enrico Bonacina
Contribution: Hg 2011-02-20
Locality: Tolfa / Rom, Provinz / Latium (Lazio), Region / Italien
Dawsonit
Views (File:
1320573876
): 1622
Dawsonit
Größe: 1,1 mm; Fundort: Limoncino, Valle Benedetta, Livorno, Provinz, Toskana (Toscana), Italien
Copyright: Enrico Bonacina; Contribution: Hg
Location: Italien/Toskana (Toscana)/Livorno, Provinz/Valle Benedetta/Limoncino
Mineral: Dawsonite
Image: 1320573876
Rating: 8.5 (votes: 2)
License: Usage for Mineralienatlas project only
Dawsonit

Größe: 1,1 mm; Fundort: Limoncino, Valle Benedetta, Livorno, Provinz, Toskana (Toscana), Italien
Copyright: Enrico Bonacina
Contribution: Hg 2011-11-06
Locality: Limoncino / Valle Benedetta / Livorno, Provinz / Toskana (Toscana) / Italien
Dawsonit
Views (File:
1235735588
): 1115
Dawsonit
Größe: 1,32 mm; Fundort: Miniera dell'Abetina, Piancastagnaio, Monte Amiata, Siena, Toskana (Toscana), Italien
Copyright: Matteo Chinellato; Contribution: Hg
Location: Italien/Toskana (Toscana)/Siena, Provinz/Monte Amiata/Piancastagnaio/Miniera dell'Abetina
Mineral: Dawsonite
Image: 1235735588
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Dawsonit

Größe: 1,32 mm; Fundort: Miniera dell'Abetina, Piancastagnaio, Monte Amiata, Siena, Toskana (Toscana), Italien
Copyright: Matteo Chinellato
Contribution: Hg 2009-02-27
Locality: Miniera dell'Abetina / Piancastagnaio / Monte Amiata / Siena, Provinz / Toskana (Toscana) / Italien
Dawsonit
Views (File:
1217281702
): 2157
Dawsonit
Bildbreite: 10 mm; Fundort: Terlano, Südtirol, Italien
Copyright: Leonardus; Contribution: slugslayer
Location: Italien/Trentino-Südtirol (Trentino-Alto Adige), Region/Südtirol (Bozen), Provinz/Etschtal/Terlan/Montigl
Mineral: Dawsonite
Image: 1217281702
Rating: 8 (votes: 2)
License: Usage for Mineralienatlas project only
Dawsonit

Bildbreite: 10 mm; Fundort: Terlano, Südtirol, Italien
Copyright: Leonardus
Contribution: slugslayer 2008-07-28
Locality: Montigl / Terlan / Etschtal / Südtirol (Bozen), Provinz / Trentino-Südtirol (Trentino-Alto Adige), Region / Italien

You find additional Dawsonit specimen at the Geolitho Museum

Collectors Summary

Color farblos, weiß
Streak color weiß
Hardness (Mohs) 3
Solubility +++ Säuren
Crystal System orthorhombisch, Imam

Chemism

Chemical formula

NaAl(CO3)(OH)2

Chemical composition

Aluminium, Natrium, Kohlenstoff, Sauerstoff, Wasserstoff

Unit weight: 143.9951324 u; Number of atoms in the formula: 10

Info

Empirical formula:

NaAl(CO3)(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.40

2

20.00

1.0079470

2.0158940
Carbon

C

8.34

1

10.00

12.0107800

12.0107800
Oxygen

O

55.56

5

50.00

15.9994300

79.9971500
Sodium

Na

15.97

1

10.00

22.9897702

22.9897702
Aluminium

Al

18.74

1

10.00

26.9815382

26.9815382

Analysis wt%

Na2O : 21.98, Al2O3 : 34.90, CO2 : 30.30, H2O : 12.70 (Ref: Dana, 7th ed. 2)

Strunz 9th edition incl. updates

5.BB.10

5: Carbonate (Carbonate, Nitrate)
B: Carbonate mit weitere Anionen, ohne H2O
B: Mit Alkalien, usw.
10:Dawsonit-Gruppe

Lapis Classification

V/C.02-020

V: NITRATE, CARBONATE UND BORATE
C: Wasserfreie Carbonate, mit fremden Anionen

Classification by Hölzel

5.BB.100

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
B: Carbonates (+Anions -Water)
B: Dawsonite-Group

Dana 8th edition

16a.03.08.01

16a: Carbonates - Hydroxyl or Halogen
03: Carbonates - Hydroxyl or Halogen where (A B)2 (XO3) Zq

IMA status

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

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, weiß

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.130
Birefringence chart\! Dawsonite title=Birefringence chart Dawsonite

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

1.466

RI value β

1.542

RI value γ / ε

1.596

Ri mean

1.535

2V angle

Biaxial (-) 75°

Optical Data Luminescence

Luminescence
Dawsonit in UV Licht
Dawsonit in UV Licht
Fundort: Terlan, Etschtal, Italien; In UV Licht 395 - 400 nm blau
Copyright: Bode; Contribution: Bode
Collection: Bode
Location: Italien/Trentino-Südtirol (Trentino-Alto Adige), Region/Südtirol (Bozen), Provinz/Etschtal/Terlan
Mineral: Dawsonite
Image: 1500231227
License: Usage for Mineralienatlas project only
Dawsonit in UV Licht

fluoreszierend, Kurzwelliges UV=matt weiß

Color LW-UV (365nm)

  

orangerot

Color SW-UV (254nm)

  

orangerot

SW-UV Other Colors

  

weiß

Afterglow (Persistant Luminescence)

keine Daten

Image ⇒ Luminescence ⇒ excitation ⇒ UV longwave ~365nm (1 Images total)

Dawsonit in UV Licht
Views (File:
1500231227
): 347
Dawsonit in UV Licht
Fundort: Terlan, Etschtal, Italien; In UV Licht 395 - 400 nm blau
Copyright: Bode; Contribution: Bode
Collection: Bode
Location: Italien/Trentino-Südtirol (Trentino-Alto Adige), Region/Südtirol (Bozen), Provinz/Etschtal/Terlan
Mineral: Dawsonite
Image: 1500231227
License: Usage for Mineralienatlas project only
Dawsonit in UV Licht

Fundort: Terlan, Etschtal, Italien; In UV Licht 395 - 400 nm blau
Collection: Bode
Copyright: Bode
Contribution: Bode 2017-07-16
Locality: Terlan / Etschtal / Südtirol (Bozen), Provinz / Trentino-Südtirol (Trentino-Alto Adige), Region / Italien

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

74

Space Group

Imam

Cell parameters a (Å)

6.77

Cell parameters b (Å)

10.40

Cell parameters c (Å)

5.58

Cell parameters a/b or c/a

0.651

Cell parameters c/b

0.537

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

392.877

X-Ray Powder Diffraction

5.67(100),
3.38(60),
2.784(90),
2.601(70),
2.151(60),
1.988(70),
1.728(70),
1.656(60)
XRD chart Dawsonite

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)

3

VHN (Hardness Vickers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.4 - 2.44 / Durchschnittlich = 2.42

2.434 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Kanada/Québec/Montréal, Region/Montréal/McGill University Campus

Preface

Associations

Calcit

Author (Name, Year)

Harrington, 1874

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: H350: Kann Krebs erzeugen., H372: Schädigt die Organe bei längerer oder wiederholter Exposition.

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 176

Other languages

Dutch

Dawsoniet

German

Dawsonit

Spanish

Dawsonita

English

Dawsonite

French

Dawsonite

Russian

Давсонит

Simplified Chinese

丝钠铝石

Traditional Chinese

絲鈉鋁石

Alternative Name

Japanese

ドーソン石

CNMNC symbol

Symbol

Dws

Locations with GPS information