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Heulandite-Ba

Collectors Summary

Color farblos bis weiß, selten sehr hell gelblich weiß;
Lustre Glasglanz, Perlmuttglanz
Hardness (Mohs) 3.5
Cleavages vollkommen (010)
Fracture halbmuschelig bis uneben
Solubility - kalte verdünnte Säuren, +++ warme 20% HCl
Crystal System monoklin, C2/m

Chemism

Chemical formula

(Ba,Ca,K,Na,Sr)5(Si27Al9)O72·22H2O

Additional chem. information

Ba-dominantes Analog von Heulandit; Bei Analysen: Si/Al < 4

Chemical composition

Aluminium, Barium, Calcium, Natrium, Silicium, Strontium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 3024.39026435 u; Number of atoms in the formula: 179

Info

Empirical formula:

(Ba0.55Ca0.25K0.1Na0.05Sr0.05)5(Si27Al9)O72·22H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.47

44

24.58

1.0079470

44.3496680

Oxygen

O

49.73

94

52.51

15.9994300

1,503.9464200

Sodium

Na

0.19

0.25

0.14

22.9897702

5.7474426

Aluminium

Al

8.03

9

5.03

26.9815382

242.8338438

Silicon

Si

25.07

27

15.08

28.0855300

758.3093100

Potassium

K

0.65

0.5

0.28

39.0983100

19.5491550

Calcium

Ca

1.66

1.25

0.70

40.0784000

50.0980000

Strontium

Sr

0.72

0.25

0.14

87.6210000

21.9052500

Barium

Ba

12.49

2.75

1.54

137.3277000

377.6511750

Analysis wt%

SiO2 : 54.26, Al2O3 : 15.27, BaO : 12.76, SrO : 1.03, CaO : 2.65, K2O : 0.58, H2O : 13.10 (Ref: European Journal of Mineralogy 2005)

Strunz 9th edition incl. updates

9.GE.05

9: Silikate (Germanate)
G: Gerüstsilikate (Tektosilikate) mit zeolithischem H2O; Familie der Zeolithe
E: Tafeln mit 4-4-1-1 Struktureinheiten
05:Heulandit-Gruppe

Lapis Classification

VIII/J.23-014

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
23: Zeolith-Gruppe; Blätterzeolithe

Classification by Hölzel

9.FN.203

9: SILICATES
F: Tektosilicates
N: Heulandite-Group

Dana 8th edition

77.01.04.01d

77: Tektosilicates Tectosilicate Zeolite group
01: Tektosilicates Tectosilicate Zeolite group true zeolites
04: Heulandite and related species

IMA status

anerkannt 2003

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Zeolite group  ⇒ HEU zeolite structure group  ⇒ Heulandite series

Optical Properties

Color

farblos bis weiß, selten sehr hell gelblich weiß;

Diaphaneity (Transparency)

durchscheinend bis transparent

Lustre

Glasglanz, Perlmuttglanz

max. Birefringence

0.009

Birefringence chart\! Heulandite-Ba title=Birefringence chart Heulandite-Ba

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

1.506

RI value β

1.506

RI value γ / ε

1.515

Ri mean

1.509

2V angle

Biaxial (+) 38°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

17.738

Cell parameters b (Å)

17.856

Cell parameters c (Å)

7.419

Cell parameters a/b or c/a

0.993

Cell parameters c/b

0.415

Cell parameters α

90°

Cell parameters β

116.55

Cell parameters γ

90°

Z

1

Volume (ų)

2102.017

X-Ray Powder Diffraction

7.94(66), 5.12 (59), 4.65(66), 3.978(97), 3.181(56), 2.973(100), 2.807(65)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.5

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.35

2.389 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (010)

Fracture

halbmuschelig bis uneben

Instability

- kalte verdünnte Säuren, +++ warme 20% HCl

Preface

Author (Name, Year)

Larsen & Nordrum & Döbelin & Armbruster & Petersen & Erambert, 2005

References

Merkle, A.B., and M. Slaughter (1968), Bestimmung und Verfeinerung der Struktur von Heulandit - American Mineralogist 53, 1120-1138. (in englisch)

Alberti, A. (1972), Über die Kristallstruktur des Zeolith Heulandit - Tschermaks Mineralogische und Petrographische Mitteilungen 18, 129-146.

European Journal of Mineralogy 17 (2005), 143.

American Mineralogist 90 (2005), 1945.

IMA group assignments

Other languages

German

Heulandit-Ba

Spanish

Heulandita-Ba

English

Heulandite-Ba

French

Heulandite-Ba

Russian

Гейландит-Ba

Alternative Name

Simplified Chinese

片沸石-Ba

Simplified Chinese

钡片沸石

CNMNC (IMA)-Number

IMA 2003-001

CNMNC symbol

Symbol

Hul-Ba

Locations with GPS information

IDs

GUSID (Global unique identifier short form) SsCWGr2skUacwLPjO7moIQ
GUID (Global unique identifier) 1A96C04A-ACBD-4691-9CC0-B3E33BB9A821
Database ID 4466