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Hellandite-(Gd)

Collectors Summary

Color gelbgrün
Hardness (Mohs) 5.00 - 5.50
Cleavages fehlt

Chemism

Chem­ical formula

(Ca,Y)4(Gd,Y)2(Al,Fe3+,Ti4+)[(Be,Li)2(O,F,OH)2|B4Si4O22]

Chem­ical com­po­si­tion

Aluminium, Beryllium, Calcium, Eisen, Gadolinium, Lithium, Silicium, Titan, Yttrium, Bor, Fluor, Sauerstoff, Wasserstoff

Unit weight: 1085.76775772 u; Number of atoms in the formula: 41.2

Info

Empirical formula:

(Ca0.75Y0.25)4(Gd0.75Y0.25)2(Al0.6Fe0.3Ti0.1)[(Be0.75Li0.25)2(O0.6F0.3(OH)0.1)2B4Si4O22]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.02

0.2

0.49

1.0079470

0.2015894
Lithium

Li

0.32

0.5

1.21

6.9412000

3.4706000
Beryllium

Be

1.25

1.5

3.64

9.0121823

13.5182735
Boron

B

3.98

4

9.71

10.8117000

43.2468000
Oxygen

O

34.48

23.4

56.80

15.9994300

374.3866620
Fluorine

F

1.05

0.6

1.46

18.9984033

11.3990420
Aluminium

Al

1.49

0.6

1.46

26.9815382

16.1889229
Silicon

Si

10.35

4

9.71

28.0855300

112.3421200
Calcium

Ca

11.07

3

7.28

40.0784000

120.2352000
Titanium

Ti

0.44

0.1

0.24

47.8671000

4.7867100
Iron

Fe

1.54

0.3

0.73

55.8452000

16.7535600
Yttrium

Y

12.28

1.5

3.64

88.9058520

133.3587780
Gadolinium

Gd

21.72

1.5

3.64

157.2530000

235.8795000

Lapis Clas­sifica­tion

VIII/F.36-012

VIII: SILIKATE
F: Ketten- und Bandsilikate
36: Komplexe Kettenstrukturen (Zylinderketten u.a.)

Min­eral sta­tus

Mineralstatus fragwürdig

IMA Classification

IMA Clas­sifica­tion

 Hellandite group

Optical Properties

Color

gelbgrün

Crystals 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

5.00 - 5.50

Cleav­ages

fehlt

References

American Mineralogist, Volume 84, pages 913–921, 1999

IMA group assignments

Other languages

German

Hellandit-(Gd)

French

Hellandite-(Gd)

English

Hellandite-(Gd)

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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RRUFF - References and PDF downloads - search for: Hellandite-(Gd)
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Mineral Dealer

German pages

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