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Roymillerite (Roymillerit)

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Roymillerit
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Roymillerit
farbloses Aggregat von Roymillerit auf schwarzem Trägermaterial, Kombat Mine, Grootfontein, Otjozondjupa, Namibia; BB ~ 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Namibia/Otjozondjupa, Region/Grootfontein, Kreis/Kombat Mine
Mineral: Roymillerite
Image: 1588957055
License: Usage for Mineralienatlas project only
Roymillerit

farbloses Aggregat von Roymillerit auf schwarzem Trägermaterial, Kombat Mine, Grootfontein, Otjozondjupa, Namibia; BB 1 mm, analysiert

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-05-08
Locality: Kombat Mine / Grootfontein, Kreis / Otjozondjupa, Region / Namibia

Collectors Summary

Color farblos, leicht pink
Lustre Glasglanz
Cleavages vollkommen (001)
Crystal System triklin, P1
Morphology abgeflachte einzelkristall-Körner bis zu 1.5 mm Durchmesser und bis 0.3 mm Dicke

Chemism

Chemical formula

Pb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5

Empirical formula (analysis)

Pb24.12Mg8.74Mn1.25Fe0.94B1.03Al1.04C9.46Si9.39H14.27O83

Chemical composition

Blei, Magnesium, Silicium, Bor, Kohlenstoff, Sauerstoff, Wasserstoff

Unit weight: 7090.376524693 u; Number of atoms in the formula: 153.24

Info

Empirical formula:

Pb24.12Mg8.74Mn1.25Fe0.94B1.03Al1.04C9.46Si9.39H14.27O83

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.20

14.27

9.31

1.0079470

14.3834037

Boron

B

0.16

1.03

0.67

10.8117000

11.1360510

Carbon

C

1.60

9.46

6.17

12.0107800

113.6219788

Oxygen

O

18.73

83

54.16

15.9994300

1,327.9526900

Magnesium

Mg

3.00

8.74

5.70

24.3050600

212.4262244

Aluminium

Al

0.40

1.04

0.68

26.9815382

28.0607997

Silicon

Si

3.72

9.39

6.13

28.0855300

263.7231267

Manganese

Mn

0.97

1.25

0.82

54.9380499

68.6725624

Iron

Fe

0.74

0.94

0.61

55.8452000

52.4944880

Lead

Pb

70.49

24.12

15.74

207.2100000

4,997.9052000

Analysis wt%

MgO : 4.93,
MnO : 1.24,
FeO : 0.95,
PbO : 75.38,
B2O3 : 0.50,
Al2O3 : 0.74,
CO2 : 5.83,
SiO2 : 7.90,
H2O : 1.8,
Total : 99.27

Strunz 9th edition incl. updates

9.EG.

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
G: Doppelnetze mit sechsfach-Ringen

Lapis Classification

VIII/H.24-004

VIII: SILIKATE
H: Schichtsilikate
24: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen;

IMA status

anerkannt - CNMNC Newsletter No. 33, Oktober 2016

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, leicht pink

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.08

Birefringence chart\! Roymillerite title=Birefringence chart Roymillerite

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 = 1.86(1)

RI value β

β ≈ γ

RI value γ / ε

γ = 1.94(1)

2V angle

Biaxial(-) 5(5)° (gemessen)

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

9.315(1)

Cell parameters b (Å)

9.316(1)

Cell parameters c (Å)

26.463(4)

Cell parameters a/b or c/a

1

Cell parameters c/b

2.841

Cell parameters α

83.295(3)°

Cell parameters β

83.308(3)°

Cell parameters γ

60.023(2)°

Z

1

Volume (ų)

1971.089

Crystal structure

Struktur bestimmt; Strukturell verwandt mit Britvinit und Molybdophyllit

X-Ray Powder Diffraction

25.9(100), 13.1(11), 3.480(12), 3.378(14), 3.282(16), 3.185(12), 2.684(16), 2.382(11)

XRD chart Roymillerite

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

Morphology

abgeflachte einzelkristall-Körner bis zu 1.5 mm Durchmesser und bis 0.3 mm Dicke

Physical Properties

Density (g/cm³)

5.973 (berechnet)

5.973 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (001)

(Co-)Type locality

(Co-)Type locality

Namibia/Otjozondjupa, Region/Grootfontein, Kreis/Kombat Mine

Type material

Cotypmaterial in den minerallogischen Sammlungen des Swedish Museum of Natural History, Stockholm, Schweden

Collection number of type material

20080176

Preface

Name from

Roymillerit wird benannt um Dr. Roy McG. Miller für seine wichtigen Beiträge zur Kenntnis der Geologie Namibias zu ehren.

Author (Name, Year)

Nikita V. Chukanov, Erik Jonsson, Sergej M. Aksenov, Sergey N. Britvin, Ramiza K. Rastsvetaeva und Dmitriy I. Belakovskiy (2016)

References

Chukanov, NV, Jonsson, E., Aksenov, SM, Britvin, SN, Rastsvetaeva, RK und Belakovskiy, DI (2016) Roymillerite, IMA 2016-061. CNMNC Newsletter Nr 33, Oktober 2016 Seite 1142; Mineralogical Magazine, 80, 1135-1144.

Nikita V. Chukanov, Erik Jonsson, Sergey M. Aksenov, Sergey N. Britvin, Ramiza K. Rastsvetaeva, Dmitriy I. Belakovskiy, Konstantin V. Van - Roymillerite, Pb24Mg9(Si9AlO28)(SiO4)(BO3)(CO3)10(OH)14O4, a new mineral: mineralogical characterization and crystal chemistry - Physics and Chemistry of Minerals pp 1–15

Other languages

German

Roymillerit

English

Roymillerite

Russian

Роймиллерит

CNMNC (IMA)-Number

IMA 2016-061

CNMNC symbol

Symbol

Roy

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Cwx8vnzxSkWFLtsATf9xKg
GUID (Global unique identifier) BE7C0C0B-F17C-454A-852E-DB004DFF712A
Database ID 8230