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Magnesiocarpholite

Collectors Summary

Color hellgün, gräulich
Hardness (Mohs) 5 - 5.5
Solubility +- HCl
Crystal System orthorhombisch, Ccca

Chemism

Chemical formula

MgAl2Si2O6(OH)4

Chemical composition

Aluminium, Magnesium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 298.4652844 u; Number of atoms in the formula: 19

Info

Empirical formula:

MgAl2Si2O6(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.35

4

21.05

1.0079470

4.0317880

Oxygen

O

53.61

10

52.63

15.9994300

159.9943000

Magnesium

Mg

8.14

1

5.26

24.3050600

24.3050600

Aluminium

Al

18.08

2

10.53

26.9815382

53.9630764

Silicon

Si

18.82

2

10.53

28.0855300

56.1710600

Analysis wt%

SiO2 : 39.90, Al2O3 : 33.10, FeO : 4.70, MgO : 10.51, H2O : 10.50 (Ref: Contributions to Mineralogy and Petrology 79)

Strunz 9th edition incl. updates

9.DB.05

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
B: Ketten- und Bandsilikate mit 2 periodischen Ketten SiO6; mit zusätzlich O, OH, H2O Pyroxen-verwandte Mineralien
05:Karpholith-Gruppe

Lapis Classification

VIII/F.03-010

VIII: SILIKATE
F: Ketten- und Bandsilikate
3: Zweierketten [Si2O6] 4-

Classification by Hölzel

9.DE.210

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
E: Orthorhombic Pyroxenes and Pyroxenoides
2: Carpholite-Group

Hey's Chemical Index of Minerals

16.19.12

16: Silicates Containing Aluminum and other Metals
19: Aluminosilicates of Fe and Mg

Dana 8th edition

65.01.05.03

65: Inosilicate Minerals
01: Inosilicates Inosilicate Single-Width Unbranched Chains, W=1 with chains P=2
05: Carpholite group

IMA status

anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

hellgün, gräulich

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.026~

Birefringence chart\! Magnesiocarpholite title=Birefringence chart Magnesiocarpholite

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

1.59

RI value β

1.60

RI value γ / ε

1.616

Ri mean

1.602

2V angle

Biaxial (+) 78°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

68

Space Group

Ccca

Cell parameters a (Å)

13.708

Cell parameters b (Å)

20.081

Cell parameters c (Å)

5.108

Cell parameters a/b or c/a

0.683

Cell parameters c/b

0.254

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volume (ų)

1406.081

X-Ray Powder Diffraction

5.66(100),
5.02(20),
3.793(30),
2.738(30),
2.594(60),
2.351(20),
2.043(20),
1.848(20)

XRD chart Magnesiocarpholite

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 - 5.5

VHN (Hardness Vickers)

530 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.82 (berechnet)

2.82 ( ρ calc. Mineralienatlas )

Instability

+- HCl

Preface

Author (Name, Year)

Goffé & Goffé-Urbano & Saliot, 1973

References

American Mineralogist 65 (1980), 406.

Contributions to Mineralogy and Petrology 76 (1981), 260.

American Mineralogist (1981) 66, 1080-1085.

Mineralogical Magazine (1992) 56, 835-838.

Handbook of Mineralogy (Anthony et al.), 2 (1995), 496

European Journal of Mineralogy 13 (2001), 533.

Bertoldi, C., Dachs, E., and Theye, T. Calorimetric data for naturally occurring magnesiocarpholite and ferrocarpholite. American Mineralogist 91 (2006), 441-445.

Other languages

Spanish

Magnesiocarfolita

French

Magnesiocarpholite

English

Magnesiocarpholite

German

Magnesiokarpholith

Russian

Магнезиокарфолит

Alternative Name

German

Magnesiocarpholit

Spanish

Magnesiocarpholita

German

Magnesiokarpholit

CNMNC (IMA)-Number

IMA 1978-027

CNMNC symbol

Symbol

Mcar

Locations with GPS information

IDs

GUSID (Global unique identifier short form) inZMVmpUCEiKSoVqAyyypQ
GUID (Global unique identifier) 564C768A-546A-4808-8A4A-856A032CB2A5
Database ID 2309