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Merwinite

Pictures (1 Images total)

Merwinit
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Merwinit
Gelbbraune schlierige Einschlüsse umschließen weiße Körner, BB = 6,1 mm; Fundort: Stbr. Caspar, Ettringer Bellerberg, Ettringen, Eifel, Rheinland-Pfalz, Deutschland.
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A031686, Donator: Willi Schüller
Location: Deutschland/Rheinland-Pfalz/Mayen-Koblenz-Kreis/Mayen/Ettringen/Bellerberg/Ettringer Bellerberg (Stbr. Caspar)
Mineral: Merwinite
Image: 1417636084
License: Usage for Mineralienatlas project only
Merwinit (SNr: A031686)

Gelbbraune schlierige Einschlüsse umschließen weiße Körner, BB = 6,1 mm; Fundort: Stbr. Caspar, Ettringer Bellerberg, Ettringen, Eifel, Rheinland-Pfalz, Deutschland.
Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2014-12-03
Locality: Ettringer Bellerberg (Stbr. Caspar) / Bellerberg / Ettringen / Mayen / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland

You find additional specimen at the Geolitho Museum

Collectors Summary

Color farblos, blassgrün
Streak color weiß
Hardness (Mohs) 6
Solubility +++ HCl
Crystal System monoklin, P21/a

Chemism

Chemical formula

Ca3Mg(SiO4)2

Chemical composition

Calcium, Magnesium, Silicium, Sauerstoff

Unit weight: 328.70676 u; Number of atoms in the formula: 14

Info

Empirical formula:

Ca3Mg(SiO4)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

38.94

8

57.14

15.9994300

127.9954400
Magnesium

Mg

7.39

1

7.14

24.3050600

24.3050600
Silicon

Si

17.09

2

14.29

28.0855300

56.1710600
Calcium

Ca

36.58

3

21.43

40.0784000

120.2352000

Analysis wt%

SiO2 : 35.50, Al2O3 : 0.66, CaO : 49.96, MgO : 11.62, FeO : 1.22 (Ref: American Mineralogist 21)

Strunz 9th edition incl. updates

9.AD.15

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
D: Insel(Neso)silikate ohne weitere Anionen; Kationen in oktahedraler [6] und gewöhnlich größerer Koordination
15:Merwinit-Gruppe

Lapis Classification

VIII/A.07-010

VIII: SILIKATE
A: Inselsilikate mit [SiO4] 4--Baugruppen
7: Kationen in oktaedrischer Koordination [6]

Classification by Hölzel

9.AB.440

9: SILICATES
A: Nesosilicates
B: Olivine-Group

Dana 8th edition

51.04.02.01

51: Nesosilicate Minerals
04: Nesosilicates Nesosilicate Insular SiO4 Groups Only with cations in [6] and >[6] coordination

IMA status

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

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, blassgrün

Streak color

weiß

max. Birefringence

0.016
Birefringence chart\! Merwinite title=Birefringence chart Merwinite

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

1.706

RI value β

1.712

RI value γ / ε

1.724

Ri mean

1.714

2V angle

Biaxial (+) 71°

Optical Data Luminescence

Color LW-UV (365nm)

  

orange

Color SW-UV (254nm)

  

gelb

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/a

Cell parameters a (Å)

13.254

Cell parameters b (Å)

5.293

Cell parameters c (Å)

9.328

Cell parameters a/b or c/a

2.504

Cell parameters c/b

1.762

Cell parameters α

90°

Cell parameters β

91.90

Cell parameters γ

90°

Z

4

Volumne (ų)

654.031

X-Ray Powder Diffraction

4.70(50),
2.752(40),
2.674(100),
2.652(50),
2.452(80),
2.211(40),
2.031(30),
1.909(30)
XRD chart Merwinite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6

VHN (Hardness Vickers)

730 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.15 (gemessen)

3.338 ( ρ calc. Mineralienatlas )

Instability

+++ HCl

(Co-)Type locality

(Co-)Type locality

USA/Kalifornien (California)/Riverside Co./Crestmore/Crestmore Quarries/Wet Weather Quarry

Preface

Occurrences

Metamorph (metasomatisch) in Kalk- und Dolomit-Skarnen.

Associations

Åkermanit, Spurrit, Larnit.

Author (Name, Year)

Larsen & Foshag, 1921

References

  • Handbook of Mineralogy (Anthony et al.), 2 (1995), 537
  • DEER, HOWIE, ZUSSMAN (1986), Rock Forming Minerals: Disilicates and Ring Silicates, Longman Scientific, 322

Other languages

German

Merwinit

Spanish

Merwinita

French

Merwinite

English

Merwinite

Russian

Мервинит

Simplified Chinese

镁硅钙石

Alternative Name

Simplified Chinese

镁蔷薇辉石

CNMNC symbol

Symbol

Mw

Rock part of

Locations with GPS information

IDs

GUSID (Global unique identifier short form) lvhHDkDPgkaPLMAG-TTdtA
GUID (Global unique identifier) 0E47F896-CF40-4682-8F2C-C006F934DDB4
Database ID 2478