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Gerenite-(Y)

Collectors Summary

Color cremeweiß
Streak color weiß
Hardness (Mohs) 5
Cleavages undeutlich {010}
Fracture uneben
Solubility ++ Raumtemp. in HCl, HNO3
Crystal System triklin, P1

Chemism

Chemical formula

(Ca,Na)2(Y,Ce)3[Si6O18]·2H2O

Chemical composition

Calcium, Cerium, Natrium, Silicium, Yttrium, Sauerstoff, Wasserstoff

Unit weight: 869.2712951 u; Number of atoms in the formula: 35

Info

Empirical formula:

(Ca0.75Na0.25)2(Y0.75Ce0.25)3[Si6O18]·2H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.46

4

11.43

1.0079470

4.0317880

Oxygen

O

36.81

20

57.14

15.9994300

319.9886000

Sodium

Na

1.32

0.5

1.43

22.9897702

11.4948851

Silicon

Si

19.39

6

17.14

28.0855300

168.5131800

Calcium

Ca

6.92

1.5

4.29

40.0784000

60.1176000

Yttrium

Y

23.01

2.25

6.43

88.9058520

200.0381670

Cerium

Ce

12.09

0.75

2.14

140.1161000

105.0870750

Strunz 9th edition incl. updates

9.CJ.45

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
J: ~[Si6O18]12- sechser-Einfachringe, ohne inselartig, komplexe [Anionen]
45:

Lapis Classification

VIII/E.13-020

VIII: SILIKATE
E: Ringsilikate
13: Sechserringe [Si6O18] 12-

Classification by Hölzel

9.CD.560

9: SILICATES
C: Cyclosilicates
D: ~[Si6O18]-rings, without borate
5: Other structures

Dana 8th edition

61.01.06.01

61: Cyclosilicates Cyclosilicate Six-Membered Rings
01: Cyclosilicates Cyclosilicate Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

cremeweiß

Streak color

weiß

max. Birefringence

0.009

Birefringence chart\! Gerenite-(Y) title=Birefringence chart Gerenite-(Y)

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

1.602

RI value β

1.607

RI value γ / ε

1.611

Ri mean

1.607

2V angle

Biaxial (+) 73°

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

9.257

Cell parameters b (Å)

9.684

Cell parameters c (Å)

5.520

Cell parameters a/b or c/a

0.956

Cell parameters c/b

0.570

Cell parameters α

97.37

Cell parameters β

100.52

Cell parameters γ

116.57

Z

1

Volume (ų)

422.556

X-Ray Powder Diffraction

8.44(80),
8.01(50),
4.51(50),
4.06(30),
3.76(70),
2.973(100),
2.930(60),
2.203(40)

XRD chart Gerenite-(Y)

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.52 (berechnet)

3.416 ( ρ calc. Mineralienatlas )

Cleavages

undeutlich {010}

Fracture

uneben

Tenacity

spröde

Instability

++ Raumtemp. in HCl, HNO3

Preface

Author (Name, Year)

Jambor & Roberts & Grice, 1998

References

Canadian Mineralogist 36 (1998), 793

Other languages

German

Gerenit-(Y)

Spanish

Gerenita-(Y)

English

Gerenite-(Y)

French

Gerenite-(Y)

Russian

Джеренит-(Y)

CNMNC (IMA)-Number

IMA 1993-034

CNMNC symbol

Symbol

Gnt-Y

Locations with GPS information

IDs

GUSID (Global unique identifier short form) IGDdnHiJNEK6UyhiaZaK2g
GUID (Global unique identifier) 9CDD6020-8978-4234-BA53-286269968ADA
Database ID 1367