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Alflarsenite (Alflarsenit)

Additional Functions

Collectors Summary

Color farblos bis weiß, Aggregate beige
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 4
Cleavages keine
Fracture uneben
Crystal System monoklin, P21

Additional information / Summary

Ein Mineral der Zeolith-Gruppe

Chemism

Chemical formula

NaCa2Be3Si4O13(OH)·2H2O

Additional chem. information

Zeolith-Gruppe

Chemical composition

Beryllium, Calcium, Natrium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 503.5558521 u; Number of atoms in the formula: 31

Info

Empirical formula:

NaCa2Be3Si4O13(OH)·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.00

5

16.13

1.0079470

5.0397350

Beryllium

Be

5.37

3

9.68

9.0121823

27.0365469

Oxygen

O

50.84

16

51.61

15.9994300

255.9908800

Sodium

Na

4.57

1

3.23

22.9897702

22.9897702

Silicon

Si

22.31

4

12.90

28.0855300

112.3421200

Calcium

Ca

15.92

2

6.45

40.0784000

80.1568000

Analysis wt%

SiO2 : 47.04, BeO : 14.74, SrO : 0.66, CaO : 22.14, Na2O : 6.06, H2O : 8.86 (Ref: European Journal of Mineralogy 2009)

Strunz 9th edition incl. updates

9.GH.

9: Silikate (Germanate)
G: Gerüstsilikate (Tektosilikate) mit zeolithischem H2O; Familie der Zeolithe
H: Unklassifizierte [Zeolithe]

Lapis Classification

VIII/G.07-027

VIII: SILIKATE
G: Übergangsstrukturen zwischen Ketten- und Schichtsilikaten

Classification by Hölzel

9.FM.310

9: SILICATES
F: Tektosilicates
M: Mordenite-Group

IMA status

anerkannt Aug. 2008

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Zeolite group  ⇒ unassigned zeolite structure group

Optical Properties

Color

farblos bis weiß, Aggregate beige

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend bis transparent

Lustre

Glasglanz

max. Birefringence

0.005

Birefringence chart\! Alflarsenite title=Birefringence chart Alflarsenite

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

1.578

RI value β

1.580

RI value γ / ε

1.583

Ri mean

1.580

2V angle

Biaxial (+) 79°

Crystallography

Crystal System

monoklin

Class (H-M)

2

Space Group number

4

Space Group

P21

Cell parameters a (Å)

7.122

Cell parameters b (Å)

19.838

Cell parameters c (Å)

9.807

Cell parameters a/b or c/a

0.359

Cell parameters c/b

0.494

Cell parameters α

90°

Cell parameters β

111.28

Cell parameters γ

90°

Z

4

Volume (ų)

1291.121

Crystal structure

aufgeklärt, siehe Joel D. Grice, Gunnar Raade, Mark A. Cooper: Alflarsenite: structure and relationship to other Be-Si and zeolite framework structures. Can. Mineral. 48 (2010) S. 255-266.

X-Ray Powder Diffraction

9.095(100), 6.279(42), 4.189(32), 3.972(76), 3.205(37), 2.964(70), 2.915(92), 2.757(33)

XRD chart Alflarsenite

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

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)

2.60 ber.

2.59 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

uneben

Tenacity

sehr spröde

Preface

Name from

dem autodidaktischen Mineralogen Alf Olav Larsen (geb. 1952), der an der Erstbeschreibung von sechs Mineralien beteiligt war und als der Experte für die Mineralogie der Syenitpegmatite des Plutonkomplexes von Larvik gilt.

Author (Name, Year)

Gunnar Raade et al., 2009

Additional Information

FTIR Spektrum in der Erstbeschreibung

References

G. Raade, J.D. Grice, M.A. Cooper: Alflarsenite, a new beryllium-silicate zeolite from a syenitic pegmatite in the Larvik plutonic complex, Oslo Region, Norway. Eur. J. Mineral. 21 (2009) S.893–900.

IMA Homepage, Minerals Approved in August 2008
Mineralien Welt 01/11, Neue Mineralien, Steffen Jahn
http://www.iza-online.org/natural/Datasheets/Alflarsenite/Alflarsenite.htm

IMA group assignments

Other languages

German

Alflarsenit

English

Alflarsenite

Russian

Альфларсенит

CNMNC (IMA)-Number

IMA 2008-023

CNMNC symbol

Symbol

Alf

IDs

GUSID (Global unique identifier short form) Md-N_iDskUiLLbCpIGVxeQ
GUID (Global unique identifier) FE8DDF31-EC20-4891-8B2D-B0A920657179
Database ID 4952