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Loudounite (Loudounit)

Additional Functions

Collectors Summary

Color weiß, hellgrün
Streak color weiß
Hardness (Mohs) 5

Chemism

Chemical formula

NaCa5Zr4Si16O40(OH)11·8H2O

Chemical composition

Calcium, Natrium, Silicium, Zirconium, Sauerstoff, Wasserstoff

Unit weight: 2008.8279892 u; Number of atoms in the formula: 112

Info

Empirical formula:

NaCa5Zr4Si16O40(OH)11·8H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.35

27

24.11

1.0079470

27.2145690
Oxygen

O

46.99

59

52.68

15.9994300

943.9663700
Sodium

Na

1.14

1

0.89

22.9897702

22.9897702
Silicon

Si

22.37

16

14.29

28.0855300

449.3684800
Calcium

Ca

9.98

5

4.46

40.0784000

200.3920000
Zirconium

Zr

18.16

4

3.57

91.2242000

364.8968000

Strunz 9th edition incl. updates

9.HF.10

9: Silikate (Germanate)
H: Unklassifizierte Silikate
F: Mit [Nb], [Ta], [Zr]
10:Loudounit-Gruppe

Lapis Classification

VIII/G.09-020

VIII: SILIKATE
G: Übergangsstrukturen zwischen Ketten- und Schichtsilikaten

Classification by Hölzel

9.GF.110

9: SILICATES
G: Unknown Structures
F: with Nb, Ta, Zr

Dana 8th edition

59.02.02.05

59: Cyclosilicate Minerals
02: Cyclosilicates Cyclosilicate Three-Membered Rings hydrated
02: Catapleiite group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

weiß, hellgrün

Streak color

weiß

max. Birefringence

0.014
Birefringence chart\! Loudounite title=Birefringence chart Loudounite

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

1.536

RI value γ / ε

1.550

2V angle

Biaxial

Crystallography

Cell parameters α

nd

Cell parameters β

nd

Cell parameters γ

nd

X-Ray Powder Diffraction

7.37(60),
5.81(50),
4.56(30),
4.36(30),
4.06(70),
3.527(40),
2.931(100),
2.694(40)
XRD chart Loudounite

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

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.48 (gemessen)

(Co-)Type locality

(Co-)Type locality

USA/Virginia/Loudoun Co./Leesburg/New Goose Creek Quarry

Preface

Author (Name, Year)

Dunn & Newbury, 1983

References

Canadian Mineralogist 21 (1983), 37

Other languages

German

Loudounit

Spanish

Loudounita

French

Loudounite

English

Loudounite

CNMNC (IMA)-Number

IMA 1982-013

CNMNC symbol

Symbol

Ldo