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Amstallite

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Amstallit
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Amstallit
Weiße prismatische Amstallit-xx (ohne Maßstab) von der Typlokalität Graphitbergbau Weinberg, Amstall, Bez. Krems-Land, NÖ, AT. In Paragenese mit weiteren weißlichen unbestimmten Mineralien, vmtl. Alunogen/Pickeringit; Ex Van den Broucke Sammlung (sh.: https://www.mindat.org/mesg-560223.html).
Copyright: Wikipedia-user: David Hospital; Contribution: oliverOliver
Location: Österreich/Niederösterreich/Krems-Land, Bezirk/Mühldorf, Marktgemeinde/Amstall/Weinberg (Graphitbergbau)
Mineral: Amstallite
Image: 1702042301
License: Creative Commons - Attribution-ShareAlike 4.0 International  (CC BY-SA) V.4.0
Amstallit

Weiße prismatische Amstallit-xx (ohne Maßstab) von der Typlokalität Graphitbergbau Weinberg, Amstall, Bez. Krems-Land, NÖ, AT. In Paragenese mit weiteren weißlichen unbestimmten Mineralien, vmtl. A...

Copyright: Wikipedia-user: David Hospital
Contribution: oliverOliver 2023-12-08
Locality: Weinberg (Graphitbergbau) / Amstall / Mühldorf, Marktgemeinde / Krems-Land, Bezirk / Niederösterreich / Österreich

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 4
Crystal System monoklin, C2/c

Chemism

Chemical formula

CaAl(Si,Al)4O8(OH)4·(H2O,Cl)

Chemical composition

Aluminium, Calcium, Chlor, Silicium, Sauerstoff, Wasserstoff

Unit weight: 396.6978074 u; Number of atoms in the formula: 24.5

Info

Empirical formula:

CaAl(Si0.75Al0.25)4O8(OH)4·((H2O)0.75Cl0.25)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.40

5.5

22.45

1.0079470

5.5437085

Oxygen

O

51.42

12.75

52.04

15.9994300

203.9927325

Aluminium

Al

13.60

2

8.16

26.9815382

53.9630764

Silicon

Si

21.24

3

12.24

28.0855300

84.2565900

Chlorine

Cl

2.23

0.25

1.02

35.4532000

8.8633000

Calcium

Ca

10.10

1

4.08

40.0784000

40.0784000

Analysis wt%

CaO : 13.80, Al2O3 : 22.84, SiO2 : 49.41, Cl : 1.75, H2O : 12.40 (Ref: Neues Jahrbuch für Mineralogie, (Monatshefte) 87)

Strunz 9th edition incl. updates

9.DP.25

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
P: Übergangsstrukturen: Ketten- und Bandsilikate - Schichtsilikat
25:Amstallit-Gruppe

Lapis Classification

VIII/G.07-040

VIII: SILIKATE
G: Übergangsstrukturen zwischen Ketten- und Schichtsilikaten

Classification by Hölzel

9.DU.320

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
U: Chains to Phyllosilicates
3: Prehnite-Group

Dana 8th edition

72.01.04.01

72: Phyllosilicates Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
01: Phyllosilicates Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.005

Birefringence chart\! Amstallite title=Birefringence chart Amstallite

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

1.533

RI value β

1.534

RI value γ / ε

1.538

Ri mean

1.535

2V angle

Biaxial (+) 57°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

18.830

Cell parameters b (Å)

11.517

Cell parameters c (Å)

5.190

Cell parameters a/b or c/a

1.635

Cell parameters c/b

0.451

Cell parameters α

90°

Cell parameters β

100.87

Cell parameters γ

90°

Z

4

Volume (ų)

1105.335

X-Ray Powder Diffraction

9.75(100),
5.43(70),
4.714(60),
4.069(40),
3.816(90),
3.603(100),
3.175(60),
2.628(40)

XRD chart Amstallite

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)

2.40 (gemessen)

2.384 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Quint, 1987

References

Neues Jahrbuch für Mineralogie, Monatshefte (1987), 253

Other languages

German

Amstallit

Spanish

Amstallita

French

Amstallite

English

Amstallite

Russian

Амсталлит

CNMNC (IMA)-Number

IMA 1986-030

CNMNC symbol

Symbol

Ams

Locations with GPS information

IDs

GUSID (Global unique identifier short form) gOeeHEpwqkG_GmKsaelsXA
GUID (Global unique identifier) 1C9EE780-704A-41AA-BF1A-62AC69E96C5C
Database ID 113