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Brewsterite-Ba (Brewsterit-Ba)

Collectors Summary

Color weiß, farblos, blassrosa
Streak color weiß
Hardness (Mohs) 4
Crystal System monoklin, , P21/m

Chemism

Chemical formula

(Ba,Sr,Ca)(Al2Si6)O16·5H2O

Chemical composition

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

Unit weight: 681.2345164 u; Number of atoms in the formula: 40

Info

Empirical formula:

(Ba0.6Sr0.3Ca0.1)(Al2Si6)O16·5H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.48

10

25.00

1.0079470

10.0794700

Oxygen

O

49.32

21

52.50

15.9994300

335.9880300

Aluminium

Al

7.92

2

5.00

26.9815382

53.9630764

Silicon

Si

24.74

6

15.00

28.0855300

168.5131800

Calcium

Ca

0.59

0.1

0.25

40.0784000

4.0078400

Strontium

Sr

3.86

0.3

0.75

87.6210000

26.2863000

Barium

Ba

12.10

0.6

1.50

137.3277000

82.3966200

Strunz 9th edition incl. updates

9.GE.20

9: Silikate (Germanate)
G: Gerüstsilikate (Tektosilikate) mit zeolithischem H2O; Familie der Zeolithe
E: Tafeln mit 4-4-1-1 Struktureinheiten
20:

Lapis Classification

VIII/J.23-090

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

Classification by Hölzel

9.FN.262

9: SILICATES
F: Tektosilicates
N: Heulandite-Group

Dana 8th edition

77.01.07.01a

77: Tektosilicates Tectosilicate Zeolite group
01: Tektosilicates Tectosilicate Zeolite group true zeolites
07: Brewsterite and related species

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Zeolite group  ⇒ BRE zeolite structure group  ⇒ Brewsterite series

Optical Properties

Color

weiß, farblos, blassrosa

Streak color

weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.014

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

1.514

RI value β

1.516

RI value γ / ε

1.528

Ri mean

1.519

2V angle

Biaxial (+) 45°

Optical Data Luminescence

Color LW-UV (365nm)

 

gelblich weiß

Color SW-UV (254nm)

 

gelblich weiß

LW-UV Other Colors

 

bläulich weiß

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m, 2

Space Group number

11, 4

Space Group

, P21/m

Cell parameters a (Å)

6.790

Cell parameters b (Å)

17.581

Cell parameters c (Å)

7.735

Cell parameters a/b or c/a

0.386

Cell parameters c/b

0.440

Cell parameters α

90°

Cell parameters β

94.50

Cell parameters γ

90°

Z

2

Volumne (ų)

920.519

X-Ray Powder Diffraction

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4

VHN (Hardness Vickers)

190 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.453

2.458 ( ρ calc. Mineralienatlas )

IMA group assignments

Other languages

German

Brewsterit-Ba

Spanish

Brewsterita-Ba

French

Brewsterite-Ba

English

Brewsterite-Ba

Russian

Брюстерит-Ba

Alternative Name

Barium-Brewsterite

Brewsterit-(Ba)

Brewsterite-(Ba)

CNMNC symbol

Symbol

Brw-Ba

Locations with GPS information