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Wairakite

Pictures (2 Images total)

Wairakit
Views (Image: 1540300478): 530
Wairakit

Tohi-Izu Mine, Shizuoka, Honshu, Japan. Bildbreite 1,3 mm

Collection: Ulrich Baumgärtl
Copyright: Ulrich Baumgärtl
Contribution: Ulrich Baumgärtl 2018-10-23
Locality: Toi Mine / Toi, Dorf / Izu, Stadt / Shizuoka, Präfektur / Chubu, Region / Honshu / Japan
Analcim-Wairakit
Views (Image: 1632153582): 140
Analcim-Wairakit (SNr: AR-AnWai-1-1-3)

Typische deltoidikositetraedrische Analcim-Wairakit-Mischkristalle aus dem Albitit der Alpe Rosso, gefunden in Orcesco am Ende der Seilbahn an der Erzverladestelle (nahe der Eisenbahnverbindung zwi...

Collection: Klaus Schäfer
Copyright: Klaus Schäfer
Contribution: Klaus Schäfer 2021-09-20
Locality: Orcesco / Druogno / Vigezzo, Valle (Tal) / Verbano-Cusio-Ossola, Provinz / Piemont (Piemonte), Region / Italien

Collectors Summary

Color farblos, weiß
Streak color weiß
Hardness (Mohs) 5.75
Solubility +++ Säuren
Crystal System monoklin, I2/a

Chemism

Chem­ical formula

CaAl2Si4O12·2H2O

Chem­ical com­po­si­tion

Aluminium, Calcium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 434.4074044 u; Number of atoms in the formula: 25

Info

Empirical formula:

CaAl2Si4O12·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.93

4

16.00

1.0079470

4.0317880

Oxygen

O

51.56

14

56.00

15.9994300

223.9920200

Aluminium

Al

12.42

2

8.00

26.9815382

53.9630764

Silicon

Si

25.86

4

16.00

28.0855300

112.3421200

Calcium

Ca

9.23

1

4.00

40.0784000

40.0784000

Anal­y­sis wt%

SiO2 : 55.90, Al2O3 : 23.00, CaO : 11.70, Na2O : 1.06, H2O : 8.50 (Ref: Mineralogical Magazine 55)

Strunz 9th edi­tion incl. updates

9.GB.05

9: Silikate (Germanate)
G: Gerüstsilikate (Tektosilikate) mit zeolithischem H2O; Familie der Zeolithe
B: Ketten von einfach verbundenen vierer-Ringen
05:Analcim-Gruppe

Lapis Clas­sifica­tion

VIII/J.27-030

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
27: Zeolith-Gruppe; Würfelzeolithe

Clas­sifica­tion by Hölzel

9.FJ.200

9: SILICATES
F: Tektosilicates
J: Singly connected 4-Ring Chains

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Zeolite group  ⇒ ANA zeolite structure group

Optical Properties

Color

farblos, weiß

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent bis durchscheinend

max. Birefrin­gence

0.004

Birefringence chart\! Wairakite title=Birefringence chart Wairakite

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

1.498

RI value β

1.500

RI value γ / ε

1.502

Ri mean

1.500

2V angle

Biaxial (+)- 88°!

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

I2/a

Cell param­e­ters a (Å)

13.69

Cell param­e­ters b (Å)

13.68

Cell param­e­ters c (Å)

13.56

Cell param­e­ters a/b or c/a

1.001

Cell param­e­ters c/b

0.991

Cell param­e­ters α

90°

Cell param­e­ters β

90.50

Cell param­e­ters γ

90°

Z

8

Volumne (ų)

2539.409

X-Ray Pow­der Diffrac­tion

6.830(30),
5.560(80),
3.423(40),
3.409(50),
3.386(100),
2.916(40),
2.911(30),
2.894(30)

XRD chart Wairakite

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)

5.75

VHN (Hard­ness Vick­ers)

630 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.26

2.272 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ Säuren

Preface

Author (Name, Year)

Steiner, 1955

References

Canadian Mineralogist 35 (1997), 1571

IMA group assignments



 
 
 
(NH4)(AlSi2O6)
tetragonal
I41/a

 
 
 
Na(Si2Al)O6·H2O
orthorhombisch
Ibca

 
 
 
Ca3Li2Be3(SiO4)3F2
kubisch
I213

 
 
 
CsBSi2O6
tetragonal
I41/acd

 
 
 
K(AlSi2)O6
tetragonal
I41/a

 
 
 
(Cs,Na)(Si2Al)O6·nH2O
kubisch
Ia3d

 
 
 
CaAl2Si4O12·2H2O
monoklin
I2/a

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Actuality: 21. Jun 2022 - 14:32:00

Other languages

German

Wairakit

Spanish

Wairakita

French

Wairakite

English

Wairakite

Russian

Вайракит

Simplified Chinese

斜钙沸石

Alternative Name

Calcium-Analcime

CNMNC symbol

Symbol

Wrk

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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American-Mineralogist-Crystal-Structure-Database - search for: Wairakite
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Russian pages

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German pages

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