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Uralborite (Uralborit)

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 4
Solubility +++ verdünnte HCl, - verdünnte CH3COOH
Crystal System monoklin, P21/n

Chemism

Chemical formula

CaB2O2(OH)4

Chemical composition

Calcium, Bor, Sauerstoff, Wasserstoff

Unit weight: 161.730168 u; Number of atoms in the formula: 13

Info

Empirical formula:

CaB2O2(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.49

4

30.77

1.0079470

4.0317880

Boron

B

13.37

2

15.38

10.8117000

21.6234000

Oxygen

O

59.36

6

46.15

15.9994300

95.9965800

Calcium

Ca

24.78

1

7.69

40.0784000

40.0784000

Analysis wt%

B2O3 : 43.42, CaO : 34.87, H2O : 22.42 (Ref: J.Min.Petr.Sci.2000)

Strunz 9th edition incl. updates

6.DA.35

6: Borate
D: Tetraborate
A: Insel(Neso)-Tetraborate
35:Uralborit-Gruppe

Lapis Classification

V/H.08-010

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

Classification by Hölzel

6.CA.500

6: Borates
C: Triborates
A: Nesotriborates
5: Uralborite-Group - 3(3T)+T (branched unit)

Dana 8th edition

25.03.04.01

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

0.011

Birefringence chart\! Uralborite title=Birefringence chart Uralborite

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

1.604

RI value β

1.609

RI value γ / ε

1.615

Ri mean

1.609

2V angle

Biaxial (+) 85°

Optical Data Luminescence

Color SW-UV (254nm)

 

violett

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/n

Cell parameters a (Å)

6.881

Cell parameters b (Å)

12.305

Cell parameters c (Å)

9.791

Cell parameters a/b or c/a

0.559

Cell parameters c/b

0.796

Cell parameters α

90°

Cell parameters β

97.27

Cell parameters γ

90°

Z

8

Volumne (ų)

822.346

X-Ray Powder Diffraction

7.68(100),
6.16(70),
3.43(80),
3.00(100),
2.26(80),
2.053(80),
1.914(80),
1.148(90)

XRD chart Uralborite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4

VHN (Hardness Vickers)

372 (50g)

Density (g/cm³)

2.60

2.612 ( ρ calc. Mineralienatlas )

Instability

+++ verdünnte HCl, - verdünnte CH3COOH

Preface

Author (Name, Year)

Malinko, 1961

References

Soviet Physics, Crystallography 16 (1971), 186

Other languages

German

Uralborit

Spanish

Uralborita

English

Uralborite

French

Uralborite

Russian

Уралборит

CNMNC symbol

Symbol

Ubo

Locations with GPS information