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Horákite (Horákit)

Collectors Summary

Color grünlich gelb, blass gelb
Streak color hellgelb
Lustre Glasglanz
Hardness (Mohs) 2
Cleavages perfekt {100}
Crystal System monoklin, C2/c

Chemism

Chemical formula

(Bi7O7OH)[(UO2)4(PO4)2(AsO4)2(OH)2]·3.5H2O

Empirical formula (analysis)

(Bi7.01Pb0.14)O7OH[(U1.01O2)4(P1.03O4)2(As0.74Si0.23O4)2(OH)2]·3.5H2O

Chemical composition

Arsen, Bismut, Phosphor, Sauerstoff, Uran, Wasserstoff

Unit weight: 3253.266044172 u; Number of atoms in the formula: 62.69

Info

Empirical formula:

(Bi7.01Pb0.14)O7OH[(U1.01O2)4(P1.03O4)2(As0.74Si0.23O4)2(OH)2]·3.5H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.31

10

15.95

1.0079470

10.0794700

Oxygen

O

18.44

37.5

59.82

15.9994300

599.9786250

Silicon

Si

0.40

0.46

0.73

28.0855300

12.9193438

Phosphorus

P

1.96

2.06

3.29

30.9737612

63.8059481

Arsenic

As

3.41

1.48

2.36

74.9216020

110.8839710

Lead

Pb

0.89

0.14

0.22

207.2100000

29.0094000

Bismuth

Bi

45.03

7.01

11.18

208.9803820

1,464.9524778

Uranium

U

29.56

4.04

6.44

238.0289130

961.6368085

Strunz 9th edition incl. updates

8.ED.

8: Phosphate, Arsenate, Vanadate
E: Uranylphosphate und Arsenate
D: Unklassifiziert

IMA status

anerkannt - CNMNC Newsletter 38 - Juli 2017

Mineral status

anerkanntes Mineral

Optical Properties

Color

grünlich gelb, blass gelb

Streak color

hellgelb

Diaphaneity (Transparency)

transparent, durchscheinend

Lustre

Glasglanz

max. Birefringence

0.07

Birefringence chart\! Horákite title=Birefringence chart Horákite

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

α ≈ 1.81

RI value β

β ≈ 1.84

RI value γ / ε

γ ≈ 1.88

2V angle

Biaxial (+) 83°

Orientation

X = b, Z ≈ c

Pleochroism

keiner

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

21.374(2)

Cell parameters b (Å)

15.451(3)

Cell parameters c (Å)

12.168(2)

Cell parameters a/b or c/a

1.383

Cell parameters c/b

0.788

Cell parameters α

90°

Cell parameters β

122.26(1)°

Cell parameters γ

90°

Z

4

Volume (ų)

3398.164

Crystal structure

Neuer Strukturtyp; Struktur bestimmt

X-Ray Powder Diffraction

11.77(100),
6.21(23),
5.55(23),
4.185(27),
3.543(61),
3.287(20),
3.144(58),
3.017(98)

XRD chart Horákite

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

Physical Properties

Hardness (Mohs)

2

Density (g/cm³)

6.358

6.359 ( ρ calc. Mineralienatlas )

Cleavages

perfekt {100}

(Co-)Type locality

(Co-)Type locality

Tschechien/Karlsbad (Karlovarský kraj)/Karlsbad (Okres Karlovy Vary)/St. Joachimsthal (Jáchymov)/Werner Mine (Rovnost)

Tschechien/Karlsbad (Karlovarský kraj)/Karlsbad (Okres Karlovy Vary)/St. Joachimsthal (Jáchymov)/Werner Mine (Rovnost)/Geister-Gang

Type material

Mineralogische Sammlung des Naturhistorischen Museeums in Prag, Tschechische Republik, Katalogummer: P1P 17/2017

Natural History Museum of Los Angeles County, Los Angeles, CA, USA, catalogue number 66575

Preface

Author (Name, Year)

Jakub Plášil, Anthony R. Kampf, Jiří Sejkora, Jiří Čejka, Radek Škoda und Jaromír Tvrdý (2017)

References

Plášil, J., Kampf, A.R., Sejkora, J., Škoda, R. and Tvrdý, J. (2017) Horákite, IMA 2017-033. CNMNC Newsletter No. 38, August 2017, page 1036; Mineralogical Magazine, 81, 1033–1038

Other languages

German

Horákit

English

Horákite

CNMNC (IMA)-Number

IMA 2017-033

CNMNC symbol

Symbol

Hor

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 6B_rRNFG7UutZ5jpVQIi8A
GUID (Global unique identifier) 44EB1FE8-46D1-4BED-AD67-98E9550222F0
Database ID 8405