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Natisite

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NATISIT
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NATISIT (SNr: 00725.)

Fundgebiet Alluaiv im Lovozero Massiv, auf der Halbinsel Kola, Russland BB.: ca. 9mm

Collection: Daniel Neumann
Copyright: Daniel Neumann
Contribution: Neumann 2012-10-13
Locality: Alluaiv / Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color grünlich grau, gelbgrün
Streak color weiß
Hardness (Mohs) 3.5
Solubility - kalte verdünnte Säuren
Crystal System tetragonal, P4/nmm

Chemism

Chem­ical formula

Na2(TiO)SiO4

Chem­ical com­po­si­tion

Natrium, Silicium, Titan, Sauerstoff

Unit weight: 201.9293204 u; Number of atoms in the formula: 9

Info

Empirical formula:

Na2(TiO)SiO4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

39.62

5

55.56

15.9994300

79.9971500

Sodium

Na

22.77

2

22.22

22.9897702

45.9795404

Silicon

Si

13.91

1

11.11

28.0855300

28.0855300

Titanium

Ti

23.70

1

11.11

47.8671000

47.8671000

Anal­y­sis wt%

Ø SiO2 : 29.77, TiO2 : 38.93, Nb2O5 : 0.72, FeO : 0.52, Na2O : 30.32 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 85)

Strunz 9th edi­tion incl. updates

9.AG.40

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

Lapis Clas­sifica­tion

VIII/B.13-010

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

Clas­sifica­tion by Hölzel

9.AG.400

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

Dana 8th edi­tion

52.04.04.01

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
04: Natisite - Yftisite group

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

grünlich grau, gelbgrün

Streak color

weiß

max. Birefrin­gence

0.076

Birefringence chart\! Natisite title=Birefringence chart Natisite

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

1.756

RI value γ / ε

1.680

Ri mean

1.731

2V angle

Uniaxial (-)

Optical Data Luminescence

Color SW-UV (254nm)

 

bläulich weiß

Most Common Acti­vator

TiO6

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

tetragonal

Class (H-M)

4/mmm

Space Group number

129

Space Group

P4/nmm

Cell param­e­ters a (Å)

6.50

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

5.07

Cell param­e­ters a/b or c/a

0.780

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

214.208

X-Ray Pow­der Diffrac­tion

5.05(80),
3.96(50),
2.709(100),
2.521(50),
2.349(60),
1.689(70),
1.611(50),
1.100(60)

XRD chart Natisite

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)

3.5

VHN (Hard­ness Vick­ers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.15

3.131 ( ρ calc. Mineralienatlas )

Insta­bil­ity

- kalte verdünnte Säuren

Preface

Author (Name, Year)

Men'shikov & Pakhomovskiy & Goyko & Bussen & Mer'kov, 1975

References

Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 104 (1975), 314

Other languages

German

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Spanish

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English

Natisite

French

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Russian

Натисит

CNMNC (IMA)-Number

IMA 1974-035

CNMNC symbol

Symbol

Nts

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