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Hungchaoite

Additional Functions

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2.5
Solubility +++ H2O
Crystal System triklin, P1

Chemism

Chemical formula

MgB4O5(OH)4·7H2O

Chemical composition

Magnesium, Bor, Sauerstoff, Wasserstoff

Unit weight: 341.685786 u; Number of atoms in the formula: 39

Info

Empirical formula:

MgB4O5(OH)4·7H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

5.31

18

46.15

1.0079470

18.1430460
Boron

B

12.66

4

10.26

10.8117000

43.2468000
Oxygen

O

74.92

16

41.03

15.9994300

255.9908800
Magnesium

Mg

7.11

1

2.56

24.3050600

24.3050600

Strunz 9th edition incl. updates

6.DA.20

6: Borate
D: Tetraborate
A: Insel(Neso)-Tetraborate
20:Hungchaoit-Gruppe

Lapis Classification

V/H.12-020

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

Classification by Hölzel

6.DA.100

6: Borates
D: Tetraborates
A: Nesotetraborates
1: Borax-Group - 4(2P+2T)

Dana 8th edition

26.04.03.01

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

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.048
Birefringence chart\! Hungchaoite title=Birefringence chart Hungchaoite

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

1.442

RI value β

1.485

RI value γ / ε

1.490

Ri mean

1.472

2V angle

Biaxial (-) 36°

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

8.811

Cell parameters b (Å)

10.644

Cell parameters c (Å)

7.888

Cell parameters a/b or c/a

0.828

Cell parameters c/b

0.741

Cell parameters α

103.38

Cell parameters β

108.58

Cell parameters γ

97.15

Z

2

Volumne (ų)

666.237

X-Ray Powder Diffraction

7.14(60),
6.71(100),
5.85(60),
5.36(80),
4.093(80),
4.079(60),
3.356(90),
2.912(70)
XRD chart Hungchaoite

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)

1.706 (gemessen)

1.703 ( ρ calc. Mineralienatlas )

Instability

+++ H2O

(Co-)Type locality

(Co-)Type locality

China/Tibet (Xizang AR)/Qinghai Plateau

Preface

Author (Name, Year)

Chun & Hsieh & Chien & Liu, 1964

References

American Mineralogist 64 (1979), 369

Other languages

German

Hungchaoit

French

Hungchaoite

English

Hungchaoite

Spanish

Hungchaoíta

Russian

Хунчжаоит

Simplified Chinese

章氏硼镁石

CNMNC symbol

Symbol

Hch