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Aristarainite (Aristarainit)

Additional Functions

Collectors Summary

Hardness (Mohs) 3.5
Solubility +++ Säuren, + heißes H2O, - kaltes H2O
Crystal System monoklin, P21/a

Chemism

Chemical formula

Na2MgB12O20·10H2O

Chemical composition

Magnesium, Natrium, Bor, Sauerstoff, Wasserstoff

Unit weight: 700.1668404 u; Number of atoms in the formula: 65

Info

Empirical formula:

Na2MgB12O20·10H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

2.88

20

30.77

1.0079470

20.1589400
Boron

B

18.53

12

18.46

10.8117000

129.7404000
Oxygen

O

68.55

30

46.15

15.9994300

479.9829000
Sodium

Na

6.57

2

3.08

22.9897702

45.9795404
Magnesium

Mg

3.47

1

1.54

24.3050600

24.3050600

Analysis wt%

Na2O : 7.30, K2O : 1.05, MgO : 5.65, B2O3 : 59.50, H2O : 25.70 (Ref: American Mineralogist 74)

Strunz 9th edition incl. updates

6.FB.05

6: Borate
F: Hexaborate
B: Ketten- und Band(Ino)-Hexaborate
05:Aristarainit-Gruppe

Lapis Classification

V/J.06-010

V: NITRATE, CARBONATE UND BORATE
J: Kettenborate [B2O4] 2- bis [B6O10] 2-

Classification by Hölzel

6.FB.100

6: Borates
F: Hexaborates
B: Inohexaborates
1: Aristarainite-Group - 6(3P+3T)

Dana 8th edition

26.06.05.01

26: Hydrated Borates Containing Hydroxyl or Halogen
06: Hydrated Borates Containing Hydroxyl or Halogen

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

max. Birefringence

0.039
Birefringence chart\! Aristarainite title=Birefringence chart Aristarainite

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

1.484

RI value β

1.498

RI value γ / ε

1.523

Ri mean

1.502

2V angle

Biaxial (-) 70°

Optical Data Luminescence

Color LW-UV (365nm)

  

gelblich grün

LW-UV Observation Frequency

sehr häufig

MW-UV (320nm)

  

gelblich grün

MW-UV Observation Frequency

sehr häufig

Color SW-UV (254nm)

  

gelbbraun

SW-UV Intensity

schwach

SW-UV Observation Frequency

Never

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/a

Cell parameters a (Å)

18.886

Cell parameters b (Å)

7.521

Cell parameters c (Å)

7.815

Cell parameters a/b or c/a

2.511

Cell parameters c/b

1.039

Cell parameters α

90°

Cell parameters β

97.72

Cell parameters γ

90°

Z

2

Volumne (ų)

1099.994

X-Ray Powder Diffraction

7.74(100),
5.40(10),
4.287(10),
3.869(10),
3.782(10),
3.037(10),
2.579(20),
2.400(10)
XRD chart Aristarainite

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)

3.5

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.027 (gemessen)

2.114 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren, + heißes H2O, - kaltes H2O

(Co-)Type locality

(Co-)Type locality

Argentinien/Salta, Provinz/Salar Del Hombre Muerto/Tincalayu Mine

Preface

Author (Name, Year)

Hurlbut & Erd, 1974

References

American Mineralogist 59 (1974), 647

Other languages

German

Aristarainit

Spanish

Aristarainita

French

Aristarainite

English

Aristarainite

Russian

Эристеренит

CNMNC (IMA)-Number

IMA 1973-029

CNMNC symbol

Symbol

Ais