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Ameghinite

Additional Functions

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2.5
Solubility +++ H2O
Crystal System monoklin, C2/c

Chemism

Chemical formula

NaB3O3(OH)4

Chemical composition

Natrium, Bor, Sauerstoff, Wasserstoff

Unit weight: 171.4526682 u; Number of atoms in the formula: 15

Info

Empirical formula:

NaB3O3(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

2.35

4

26.67

1.0079470

4.0317880
Boron

B

18.92

3

20.00

10.8117000

32.4351000
Oxygen

O

65.32

7

46.67

15.9994300

111.9960100
Sodium

Na

13.41

1

6.67

22.9897702

22.9897702

Analysis wt%

B2O3 : 59.30, Na2O : 19.50, H2O : 21.30 (Ref: American Mineralogist 67)

Strunz 9th edition incl. updates

6.CA.10

6: Borate
C: Triborate
A: Insel (Neso)-Triborate
10:Ameghinit-Gruppe

Lapis Classification

V/H.05-010

V: NITRATE, CARBONATE UND BORATE
H: Gruppenborate
5: Planare und tetraedrische Gruppen [B3O5] 1- bis [B6O10] 2-

Classification by Hölzel

6.CA.100

6: Borates
C: Triborates
A: Nesotriborates
1: Ameghinite-Group - 3(2P+T)

Dana 8th edition

25.03.01.01

25: Anhydrous Borates Containing Hydroxyl or Halogen
03: Anhydrous Borates Containing Hydroxyl or Halogen

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.109
Birefringence chart\! Ameghinite title=Birefringence chart Ameghinite

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

1.429

RI value β

1.528

RI value γ / ε

1.538

Ri mean

1.498

2V angle

Biaxial (-) 33°

Optical Data Luminescence

Color LW-UV (365nm)

  

bläulich weiß

LW-UV Intensity

stark

Color SW-UV (254nm)

  

bläulich weiß

SW-UV Intensity

stark

Color SW-UV Afterglow (254nm)

  

bläulich weiß

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

18.423

Cell parameters b (Å)

9.882

Cell parameters c (Å)

6.326

Cell parameters a/b or c/a

1.864

Cell parameters c/b

0.640

Cell parameters α

90°

Cell parameters β

104.38

Cell parameters γ

90°

Z

8

Volume (ų)

1115.604

X-Ray Powder Diffraction

4.951(10),
3.352(20),
3.147(80),
3.064(100),
2.914(20),
2.655(10),
2.548(30),
2.465(10)
XRD chart Ameghinite

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)

2.030 (gemessen)

2.041 ( ρ calc. Mineralienatlas )

Instability

+++ H2O

(Co-)Type locality

(Co-)Type locality

Argentinien/Catamarca, Provinz/Antofagasta de la Sierra, Departamento/Salar del Hombre Muerto/Tincalayu Mine

Preface

Author (Name, Year)

Aristarain & Hurlbut, 1967

References

American Mineralogist 52 (1967), 935.

Yongliang Xiong, Leslie Kirkes, Jandi Knox, Cassie Marrs: Experimental Determination of Solubilities of Sodium Polyborates In MgCl2 Solutions: Solubility Constant of Di-Sodium Hexaborate Tetrahydrate, and Implications For the Diagenetic Formation of Ameghinite. The Canadian Mineralogist Vol. 55, Nr. 6 (2017) S. 1001-1008.

Other languages

German

Ameghinit

Spanish

Ameghinita

French

Ameghinite

English

Ameghinite

Russian

Амегинит

CNMNC (IMA)-Number

IMA 1966-034

CNMNC symbol

Symbol

Agh

IDs

GUSID (Global unique identifier short form) 5Nls9VRJhkqmR1VrWFovlA
GUID (Global unique identifier) F56CD9E4-4954-4A86-A647-556B585A2F94
Database ID 104