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Jeffreyite


You find additional specimen at the Geolitho Museum

Collectors Summary

Hardness (Mohs) 5
Solubility ++ HCl
Crystal System orthorhombisch, C2221

Chemism

Chemical formula

(Ca,Na)2(Be,Al)Si2(O,OH)7

Chemical composition

Aluminium, Beryllium, Calcium, Natrium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 255.047983625 u; Number of atoms in the formula: 13.75

Info

Empirical formula:

(Ca0.75Na0.25)2(Be0.75Al0.25)Si2(O0.75(OH)0.25)7

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.69

1.75

12.73

1.0079470

1.7639073

Beryllium

Be

2.65

0.75

5.45

9.0121823

6.7591367

Oxygen

O

43.91

7

50.91

15.9994300

111.9960100

Sodium

Na

4.51

0.5

3.64

22.9897702

11.4948851

Aluminium

Al

2.64

0.25

1.82

26.9815382

6.7453846

Silicon

Si

22.02

2

14.55

28.0855300

56.1710600

Calcium

Ca

23.57

1.5

10.91

40.0784000

60.1176000

Analysis wt%

SiO2 : 46.70, Al2O3 : 2.80, BeO : 8.10, CaO : 37.40, Na2O : 2.30, H2O : 1.80 (Ref: Canadian Mineralogist 84)

Strunz 9th edition incl. updates

9.BB.10

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
B: Si2O7 Gruppen, ohne nicht-tetrahedrale Anionen; Kationen in tetrahedraler [4] und größerer Koordination
10:

Lapis Classification

VIII/C.02-060

VIII: SILIKATE
C: Gruppensilikate
2: Gruppensilikate [Si2O7] 6-, ohne tetraederfremde Anionen; Melilith-Gruppe mit Anhang

Classification by Hölzel

9.BB.220

9: SILICATES
B: Sorosilicates
B: Melilite-Group

Dana 8th edition

55.04.02.03

55: Sorosilicate Minerals
04: Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with cations in [8] and lower coordination
02: Fresnoite group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

max. Birefringence

0.018

Birefringence chart\! Jeffreyite title=Birefringence chart Jeffreyite

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

1.625

RI value β

1.641

RI value γ / ε

1.643

Ri mean

1.636

2V angle

Biaxial (-) 40°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

222

Space Group number

20

Space Group

C2221

Cell parameters a (Å)

14.90

Cell parameters b (Å)

14.90

Cell parameters c (Å)

40.41

Cell parameters a/b or c/a

1.000

Cell parameters c/b

2.712

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

64

Volume (ų)

8971.424

X-Ray Powder Diffraction

5.00(40),
2.993(90),
2.774(100),
2.541(60),
2.360(40),
2.229(40),
1.866(40),
1.755(50)

XRD chart Jeffreyite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.99 (gemessen)

3.021 ( ρ calc. Mineralienatlas )

Instability

++ HCl

Preface

Author (Name, Year)

Grice & Robinson, 1984

References

Canadian Mineralogist 22 (1984), 443

Other languages

German

Jeffreyit

Spanish

Jeffreyita

French

Jeffreyite

English

Jeffreyite

Russian

Джеффрейит

CNMNC (IMA)-Number

IMA 1982-075

IMA 1982-095

CNMNC symbol

Symbol

Jfy

Locations with GPS information

IDs

GUSID (Global unique identifier short form) VJPbxpZmlkuMOGsg2dDC_g
GUID (Global unique identifier) C6DB9354-6696-4B96-8C38-6B20D9D0C2FE
Database ID 1783