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Mountainite

Collectors Summary

Color weiß
Streak color weiß
Hardness (Mohs) 3
Solubility +++ Säuren
Crystal System monoklin, P21/a, P21/c, P21/n

Chemism

Chemical formula

KNa2Ca2[Si8O19(OH)]·6H2O

Chemical composition

Calcium, Natrium, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 819.0073814 u; Number of atoms in the formula: 52

Info

Empirical formula:

KNa2Ca2[Si8O19(OH)]·6H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.60

13

25.00

1.0079470

13.1033110

Oxygen

O

50.79

26

50.00

15.9994300

415.9851800

Sodium

Na

5.61

2

3.85

22.9897702

45.9795404

Silicon

Si

27.43

8

15.38

28.0855300

224.6842400

Potassium

K

4.77

1

1.92

39.0983100

39.0983100

Calcium

Ca

9.79

2

3.85

40.0784000

80.1568000

Analysis wt%

SiO2 : 58.50, CaO : 13.40, Na2O : 7.90, K2O : 6.00, H2O : 13.40 (Ref: Mineralogical Magazine 57)

Strunz 9th edition incl. updates

9.GG.10

9: Silikate (Germanate)
G: Gerüstsilikate (Tektosilikate) mit zeolithischem H2O; Familie der Zeolithe
G: Käfige und Doppelkäfige von 4-, 6-, und achtfach-Ringen
10:

Lapis Classification

VIII/H.38-015

VIII: SILIKATE
H: Schichtsilikate
38: Schichtsilikate mit Tetraeder-Doppelschichten und verwandte Strukturen

Classification by Hölzel

9.ES.170

9: SILICATES
E: Phyllosilicates
S: Phyllosilicates with tetrahedral Doublelayers

Dana 8th edition

77.02.03.01

77: Tektosilicates Tectosilicate Zeolite group
02: Tektosilicates Tectosilicate Zeolite group related species

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Zeolite group  ⇒ unassigned zeolite structure group

Optical Properties

Color

weiß

Streak color

weiß

max. Birefringence

0.015

Birefringence chart\! Mountainite title=Birefringence chart Mountainite

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

1.504

RI value β

1.510

RI value γ / ε

1.519

Ri mean

1.511

2V angle

Biaxial (+) 76° (berechnet)

Orientation

Y = b, Z ^ c = 18

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/a, P21/c, P21/n

Cell parameters a (Å)

13.704

Cell parameters b (Å)

6.576

Cell parameters c (Å)

13.751

Cell parameters a/b or c/a

2.084

Cell parameters c/b

2.091

Cell parameters α

90°

Cell parameters β

105.75

Cell parameters γ

90°

Z

2

Volumne (ų)

1192.68

X-Ray Powder Diffraction

13.1(80),
6.6(90),
4.67(80),
4.18(50),
2.94(100),
2.80(70),
1.967(70),
1.719(50)

XRD chart Mountainite

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)

3

Density (g/cm³)

2.36 (gemessen) 2.47 (berechnet)

2.28 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

Preface

Author (Name, Year)

Gard & Taylor & Chalmers, 1957

References

Mineralogical Magazine 31 (1957), 611

Zubkova, N.V. et al., Z. Krist. 224 (2009) S.389-396. - [neue Formel]

http://filinchuk.com/publ/FilArt111.pdf

IMA group assignments

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Mountainite

KNa2Ca2[Si8O19(OH)]·6H2O

monoklin : 2/m : P21/a, P21/c, P21/n

9.GG.10

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Monteregianite-(Y)

KNa2YSi8O19·5H2O

monoklin : 2/m : P21/n

VIII/H.38-010

Mountainite

KNa2Ca2[Si8O19(OH)]·6H2O

monoklin : 2/m : P21/a, P21/c, P21/n

VIII/H.38-015

Rhodesite

KHCa2Si8O19·5H2O

orthorhombisch : mmm : Pmcm

VIII/H.38-020

Günterblassite

(K,Ca,Ba,Na,☐)3Fe[(Si,Al)13O25(OH,O)4]·7H2O

orthorhombisch : mm2 : Pnm21

VIII/H.38-022

Fivegite

K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl {x=0-2}

orthorhombisch : mm2 : Pm21n

VIII/H.38-025

Umbrianite

K7Na2Ca2[Al3Si10O29]F2Cl2

orthorhombisch : mmm : Pmmn

VIII/H.38-028

Delhayelite

K7Na3Ca5Al2Si14O38F4Cl2

orthorhombisch : mmm : Pmmn

VIII/H.38-030

Hydrodelhayelite

KCa2AlSi7O17(OH)2·6H2O

orthorhombisch : mm2 : Pnm21

VIII/H.38-040

Macdonaldite

BaCa4Si16O36(OH)2·10H2O

orthorhombisch : mmm : Cmcm

VIII/H.38-050

Seidite-(Ce)

Na4Sr(Ce,La)Ti[(F,OH)|Si8O22]·5H2O

monoklin : 2/m : C2/c

VIII/H.38-055

Ilímaussite-(Ce)

(Ba,Na)10K3Na4.5Ce5(Nb,Ti)6O6(Si12O36)(Si9O18)(O,OH)24

trigonal : 32 : R32

VIII/H.38-057

Cymrite

Ba(Si,Al)4(O,OH)8·H2O

monoklin : m : Pm

VIII/H.38-060

Kampfite

Ba12(Si11Al5)O31(CO3)8Cl5

monoklin : m : Cc

VIII/H.38-065

Lourenswalsite

(K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12

VIII/H.38-080

Tienshanite

(Na,K)9-10(Ca,Y)2Ba6(Mn2+,Fe2+,Ti4+,Zn)6(Ti,Nb) [(O,F,OH)11|B2O4|Si6O15]6

hexagonal : 6/m : P6/m

VIII/H.38-085

Wickenburgite

Pb3CaAl[Si10O27]·3H2O

trigonal : 3m : P31c

VIII/H.38-090

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Fedorite

(Na,K)2-3(Ca,Na)7[Si4O8(F,Cl,OH)2|(Si4O10)3]·3.5H2O

triklin : 1 : P1

9.ES.100

Delhayelite

K7Na3Ca5Al2Si14O38F4Cl2

orthorhombisch : mmm : Pmmn

9.ES.110

Hydrodelhayelite

KCa2AlSi7O17(OH)2·6H2O

orthorhombisch : mm2 : Pnm21

9.ES.115

Hillesheimite

(K,Ca,Ba,☐)2(Mg,Fe,Ca,☐)2[(Si,Al )13O23(OH)6](OH)·8H2O

orthorhombisch : mmm : Pmmn

9.ES.116

Günterblassite

(K,Ca,Ba,Na,☐)3Fe[(Si,Al)13O25(OH,O)4]·7H2O

orthorhombisch : mm2 : Pnm21

9.ES.117

Rhodesite

KHCa2Si8O19·5H2O

orthorhombisch : mmm : Pmcm

9.ES.120

Fivegite

K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl {x=0-2}

orthorhombisch : mm2 : Pm21n

9.ES.125

Macdonaldite

BaCa4Si16O36(OH)2·10H2O

orthorhombisch : mmm : Cmcm

9.ES.130

Monteregianite-(Y)

KNa2YSi8O19·5H2O

monoklin : 2/m : P21/n

9.ES.150

Mountainite

KNa2Ca2[Si8O19(OH)]·6H2O

monoklin : 2/m : P21/a, P21/c, P21/n

9.ES.170

Cryptophyllite

K2Ca[Si4O10]·5H2O

monoklin : 2/m : P21/n

9.ES.180

Shlykovite

KCa[Si4O9(OH)]·3H2O

monoklin : 2/m : P21/c

9.ES.185

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Lithosite

K6Al4Si8O25·2H2O

monoklin : 2 : P21

77.02.02.01

Mountainite

KNa2Ca2[Si8O19(OH)]·6H2O

monoklin : 2/m : P21/a, P21/c, P21/n

77.02.03.01

Parthéite

Ca2(Si4Al4)O15(OH)2·4H2O

monoklin : 2/m : C2/c

77.02.04.01

Strätlingite

Ca2Al[(OH)6AlSiO2(OH)4]·2.5 H2O

trigonal : 3m : R3m

77.02.05.01

Gaultite

Na4Zn2Si7O18·5H2O

orthorhombisch : mm2 : F2dd

77.02.06.01

Kalborsite

K6Al4Si6BO20(OH)4Cl

tetragonal : 42m : P421c

77.02.07.01

Verplanckite

Ba4Mn2+2Si4O12(OH,H2O)3Cl3

hexagonal : 6/mmm : P6/mmm

77.02.08.01

Other languages

German

Mountainit

Spanish

Mountainita

English

Mountainite

French

Mountainite

Russian

Маунтинит

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German pages

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