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Terskite (Terskit)

Pictures (3 Images total)

Terskit
Views (Image: 1263221721): 813
Terskit

Bildbreite: 15 mm; Fundort: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville Co., Québec, Kanada
Copyright: Stephan Wolfsried
Contribution: Hg 2010-01-11
Locality: Poudrette Quarry (Demix Quarry; Uni-Mix Quarry; Desourdy Quarry) / Mont Saint-Hilaire / La Vallée-du-Richelieu RCM / Montérégie, Region / Québec / Kanada
Terskit
Views (Image: 1081188326): 880
Terskit

Fliederfarbenes bis blasslila Umwandlungsprodukt von Eudialyt - Terskit; Bildbreite: 6 mm; Fundort: Alluaiv-Berg, Lovozero-Massiv, Kola-Halbinsel, Russland;
Collection: McSchuerf
Copyright: McSchuerf
Contribution: Mineralienatlas 2004-04-05
Locality: Alluaiv / Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland
Eudialyt (xx) ummantelt von weißem Terskit
Views (Image: 1241340365): 1352
Eudialyt (xx) ummantelt von weißem Terskit

in faserigem Aegirin; Größe: 70x45x30 mm; Fundort: Shkatulka-Pegmatit, Umbozero, Alluaiv, Lovozero, Kola Peninsula, Russland
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-05-03
Locality: Shkatulka-Pegmatit / Umbozero / Alluaiv / Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color weiß, helllila
Streak color weiß
Hardness (Mohs) 5.25
Solubility - verdünnte HCl oder HNO3
Crystal System orthorhombisch, Pnc2

Chemism

Chem­ical formula

Na4Zr(H4Si6O18)

Chem­ical com­po­si­tion

Natrium, Silicium, Zirconium, Sauerstoff, Wasserstoff

Unit weight: 643.7179888 u; Number of atoms in the formula: 33

Info

Empirical formula:

Na4Zr(H4Si6O18)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.63

4

12.12

1.0079470

4.0317880
Oxygen

O

44.74

18

54.55

15.9994300

287.9897400
Sodium

Na

14.29

4

12.12

22.9897702

91.9590808
Silicon

Si

26.18

6

18.18

28.0855300

168.5131800
Zirconium

Zr

14.17

1

3.03

91.2242000

91.2242000

Anal­y­sis wt%

Ø SiO2 : 56.30, ZrO2 : 17.80, MnO : 0.40, Na2O : 19.00, H2O : 6.37 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 83)

Strunz 9th edi­tion incl. updates

9.DM.40

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
M: Ketten- und Bandsilikate mit 6-periodischen Einfachketten
40:Terskit-Gruppe

Lapis Clas­sifica­tion

VIII/F.23-020

VIII: SILIKATE
F: Ketten- und Bandsilikate
23: Dreierbänder [Si6O15/17] 6-/10- und modifizierte Dreierbänder

Clas­sifica­tion by Hölzel

9.CD.520

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

Dana 8th edi­tion

78.07.15.01

78: Unclassified Silicate Minerals
07: Unclassified silicates wholly unclassified silicates

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

weiß, helllila

Streak color

weiß

max. Birefrin­gence

0.008
Birefringence chart\! Terskite title=Birefringence chart Terskite

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

1.576

RI value β

1.582

RI value γ / ε

1.584

Ri mean

1.581

2V angle

Biaxial (-) 53°

Optical Data Luminescence

Lumi­nes­cence

fluoreszierend

Color LW-UV (365nm)

  

gelblich weiß

LW-UV Intensity

mittel

MW-UV (320nm)

  

grün

Color SW-UV (254nm)

  

grün

SW-UV Other Col­ors

  

gelblich weiß

Most Common Acti­vator

(UO2)2+ (Uranyl-Ion) als Verunreinigungen

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mm2

Space Group number

30

Space Group

Pnc2

Cell param­e­ters a (Å)

14.12

Cell param­e­ters b (Å)

14.69

Cell param­e­ters c (Å)

7.51

Cell param­e­ters a/b or c/a

0.961

Cell param­e­ters c/b

0.511

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

1557.745

X-Ray Pow­der Diffrac­tion

4.84(60),
4.07(50),
3.49(50),
3.31(100),
2.716(70),
2.610(80),
2.554(80),
2.102(60)
XRD chart Terskite

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)

5.25

VHN (Hard­ness Vick­ers)

478 (40g)

Density (g/cm³)

2.71

2.745 ( ρ calc. Mineralienatlas )

Insta­bil­ity

- verdünnte HCl oder HNO3

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Karnasurt, Berg/Jubiläumspegmatit (Yubileinaya; Yubileinoye; Jubilejnaja)

Kanada/Québec/Montérégie, Region/Lajammerais, RCM/Varennes & Saint-Amable/Saint-Amable sill/Demix-Varennes Quarry

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Alluaiv

Preface

Author (Name, Year)

Khomyakov & Semenov & Voronkov & Nechelyustov, 1983

References

Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 112 (1983), 226

Other languages

German

Terskit

Spanish

Terskita

English

Terskite

French

Terskite

Russian

Терскит

Traditional Chinese

突矽鈉鋯石

Simplified Chinese

突硅钠锆石

CNMNC (IMA)-Number

IMA 1982-039

CNMNC symbol

Symbol

Ter

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

German pages

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

English pages

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

Russian pages

 Webmineral.ru - search for: Терскит

Mineral Dealer

German pages

 hausen - Mineralgroßhandel - search for: Terskit
Crystal-Treasure.com - search for: Terskit
Bosse - search for: Terskit
Edelsteine Neuburg - Gundolf Fischer - search for: Terskit

Locations with GPS information