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Trimounsite-(Y)

Collectors Summary

Color hellbraun
Streak color weiß
Hardness (Mohs) 7
Cleavages keine
Fracture uneben
Solubility - HCl, HNO3, H2SO4
Crystal System monoklin, P21/c

Chemism

Chem­ical formula

(Y,Dy,Er,Yb,Gd,Ho,Tb,Sm)2Ti2SiO9

Chem­ical com­po­si­tion

Dysprosium, Erbium, Gadolinium, Holmium, Samarium, Silicium, Terbium, Titan, Ytterbium, Yttrium, Sauerstoff

Unit weight: 513.3425472 u; Number of atoms in the formula: 14

Info

Empirical formula:

(Y0.55Dy0.25Er0.1Yb0.05Gd0.05Ho0Tb0Sm0)2Ti2SiO9

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

28.05

9

64.29

15.9994300

143.9948700
Silicon

Si

5.47

1

7.14

28.0855300

28.0855300
Titanium

Ti

18.65

2

14.29

47.8671000

95.7342000
Yttrium

Y

19.05

1.1

7.86

88.9058520

97.7964372
Gadolinium

Gd

3.06

0.1

0.71

157.2530000

15.7253000
Dysprosium

Dy

15.83

0.5

3.57

162.5001000

81.2500500
Erbium

Er

6.52

0.2

1.43

167.2593000

33.4518600
Ytterbium

Yb

3.37

0.1

0.71

173.0430000

17.3043000

Anal­y­sis wt%

Ø SiO2 : 11.77, TiO2 : 34.47, Y2O3 : 34.62, Sm2O3 : 0.40, Gd2O3 : 1.92, Tb2O3 : 0.71, Dy2O3 : 5.67, Ho2O3 : 0.79, Er2O3 : 5.04, Yb2O3 : 4.83, Ln2O3 : 53.98 (Ref: European Journal of Mineralogy 90)

Strunz 9th edi­tion incl. updates

9.AG.25

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
G: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in meist [6] und > [6] Koordination
25:

Lapis Clas­sifica­tion

VIII/B.12-030

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
12: Kationen mit Koordinationszahlen zwischen [8] und [12]

Clas­sifica­tion by Hölzel

9.AG.470

9: SILICATES
A: Nesosilicates
G: Nesosilicates with Cation: O
4: C small + large; Titanite-Group

Dana 8th edi­tion

52.04.08.01

52: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
04: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or > [6] coordination

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

hellbraun

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent bis durchscheinend

RI value α / ω / n

2.10>

RI value β

2.10>

RI value γ / ε

2.10>

Ri mean

2.10>

2V angle

Biaxial (-) nd

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell param­e­ters a (Å)

12.299

Cell param­e­ters b (Å)

11.120

Cell param­e­ters c (Å)

4.858

Cell param­e­ters a/b or c/a

1.106

Cell param­e­ters c/b

0.437

Cell param­e­ters α

90°

Cell param­e­ters β

95.62

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

661.21

X-Ray Pow­der Diffrac­tion

3.44(90),
2.820(100),
2.777(40),
2.359(40),
2.117(50),
1.959(60),
1.643(60),
1.628(50)
XRD chart Trimounsite-(Y)

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)

7

VHN (Hard­ness Vick­ers)

1300 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

5

5.156 ( ρ calc. Mineralienatlas )

Cleav­ages

keine

Frac­ture

uneben

Tenac­ity

spröde

Insta­bil­ity

- HCl, HNO3, H2SO4

(Co-)Type locality

(Co-)Type locality

Frankreich/Okzitanien (Occitanie), Region/Ariège, Département/Foix, Arrondissement/Luzenac/Trimouns Talksteinbruch

Preface

Author (Name, Year)

Piret & Deliens & Pinet, 1990

References

European Journal of Mineralogy 2 (1990), 725

Other languages

German

Trimounsit-(Y)

Spanish

Trimounsita-(Y)

English

Trimounsite-(Y)

French

Trimounsite-(Y)

Russian

Тримунсит-(Y)

CNMNC (IMA)-Number

IMA 1989-042

CNMNC symbol

Symbol

Tmo-Y

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

German pages

 DeWikiPedia - search for: Trimounsit-(Y)
Google-Bilder-Suche - search for: Trimounsit-(Y)
Mineralienatlas.de (Forum) - search for: Trimounsit-(Y)

English pages

 Mindat - search for: Trimounsite-(Y)
Webmineral - search for:Trimounsite-(Y)
Handbook-of-Mineralogy - search for: Trimounsite-(Y)
RRUFF - Raman, XRD and other mineral data - search for: Trimounsite-(Y)
RRUFF - References and PDF downloads - search for: Trimounsite-(Y)
American-Mineralogist-Crystal-Structure-Database - search for: Trimounsite-(Y)
Strahlen.org - search for: Trimounsite-(Y)

Russian pages

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Mineral Dealer

German pages

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Locations with GPS information