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Merrihueite (Merrihueit)

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Merrihueit
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Merrihueit
Bildbreite: 1 mm; Fundort: Stbr. Caspar, Ettringer Bellerberg, Ettringen, Eifel, Deutschland
Copyright: Fred Kruijen; Contribution: slugslayer
Location: Deutschland/Rheinland-Pfalz/Mayen-Koblenz-Kreis/Mayen/Ettringen/Bellerberg/Ettringer Bellerberg (Stbr. Caspar)
Mineral: Merrihueite
Image: 1249803782
Rating: 10 (votes: 1)
License: Usage for Mineralienatlas project only
Merrihueit

Bildbreite: 1 mm; Fundort: Stbr. Caspar, Ettringer Bellerberg, Ettringen, Eifel, Deutschland
Copyright: Fred Kruijen
Contribution: slugslayer 2009-08-09
Locality: Ettringer Bellerberg (Stbr. Caspar) / Bellerberg / Ettringen / Mayen / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland

You find additional Merrihueit specimen at the Geolitho Museum

Collectors Summary

Color farblos, weiß
Streak color weiß
Hardness (Mohs) 6.5
Crystal System hexagonal, P6/mcc

Chemism

Chemical formula

(K,Na)2(Fe2+,Mg)5Si12O30

Chemical composition

Eisen, Magnesium, Natrium, Silicium, Kalium, Sauerstoff

Unit weight: 1126.9524351 u; Number of atoms in the formula: 49

Info

Empirical formula:

(K0.75Na0.25)2(Fe0.75Mg0.25)5Si12O30

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

42.59

30

61.22

15.9994300

479.9829000
Sodium

Na

1.02

0.5

1.02

22.9897702

11.4948851
Magnesium

Mg

2.70

1.25

2.55

24.3050600

30.3813250
Silicon

Si

29.91

12

24.49

28.0855300

337.0263600
Potassium

K

5.20

1.5

3.06

39.0983100

58.6474650
Iron

Fe

18.58

3.75

7.65

55.8452000

209.4195000

Strunz 9th edition incl. updates

9.CM.05

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
M: ~[Si6O18]12- sechser-Doppelringe
05:Milarit-Gruppe

Lapis Classification

VIII/E.22-060

VIII: SILIKATE
E: Ringsilikate
22: Doppelte Sechserringe [Si12O30] 12-; Milarit/Osumilith-Gruppe

Classification by Hölzel

9.CF.410

9: SILICATES
C: Cyclosilicates
F: ~[Si12O30]12--Rings Milarite-Group

Dana 8th edition

63.02.01a.05

63: Cyclosilicates Cyclosilicate Condensed Rings
02: Cyclosilicates Cyclosilicate Condensed Rings 6-membered rings
01a: Milarite - Osumilite group (Milarite - Osumilite subgroup)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Osumilite Group

Optical Properties

Color

farblos, weiß

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

moderat-nicht wahrnehmbar

RI value α / ω / n

1.559 - 1.592

RI value γ / ε

1.576

2V angle

Uniaxial

Crystallography

Crystal System

hexagonal

Class (H-M)

6/mmm

Space Group number

192

Space Group

P6/mcc

Cell parameters a (Å)

10.16

Cell parameters b (Å)

-

Cell parameters c (Å)

14.32

Cell parameters a/b or c/a

1.409

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volumne (ų)

1280.151

X-Ray Powder Diffraction

7.13(80),
5.03(30),
3.73(100),
3.23(90),
2.92(60),
2.774(100),
2.530(50),
2.166(20)
XRD chart Merrihueite

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)

6.5

VHN (Hardness Vickers)

960 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.636 (berechnet)

2.923 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Rumänien/Harghita, Kreis/Mezö-Madaras

Preface

Author (Name, Year)

Dodd & van Schmus & Marvin, 1965

References

Science 149 (1965), 972

American Mineralogist 50 (1965), 1096

Acta Crytallographica B28 (1972), 267

IMA group assignments

Other languages

German

Merrihueit

French

Merrihueite

English

Merrihueite

Spanish

Merrihueíta

Russian

Меррихьюит

Simplified Chinese

陨铁大隅石

CNMNC (IMA)-Number

IMA 1965-020

CNMNC symbol

Symbol

Mhu

Locations with GPS information