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Talc-1A

Collectors Summary

Color farblos, weiß , grün, braun
Streak color weiß
Lustre Perlmuttglanz, Fettglanz, matt
Hardness (Mohs) 1
Cleavages vollkommen {001}
Crystal System triklin, P1

Chemism

Chem­ical formula

Mg3Si4O10(OH)2

Addi­tional chem. informa­tion

Polytyp von Talk

Chem­ical com­po­si­tion

Magnesium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 379.266354 u; Number of atoms in the formula: 21

Info

Empirical formula:

Mg3Si4O10(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.53

2

9.52

1.0079470

2.0158940

Oxygen

O

50.62

12

57.14

15.9994300

191.9931600

Magnesium

Mg

19.23

3

14.29

24.3050600

72.9151800

Silicon

Si

29.62

4

19.05

28.0855300

112.3421200

Strunz 9th edi­tion incl. updates

9.EC.05

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
05:Talk-Gruppe

Min­eral sta­tus

Polytype

Var­i­ety / poly­type of

Talc

Optical Properties

Color

farblos, weiß , grün, braun

Streak color

weiß

Diaphane­ity (Trans­parency)

durchscheinend

Lus­tre

Perlmuttglanz, Fettglanz, matt

max. Birefrin­gence

0.050

Birefringence chart\! Talc-1A title=Birefringence chart Talc-1A

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

1.539 - 1.550

RI value β

1.589 - 1.594

RI value γ / ε

1.589 - 1.600

Ri mean

1.577

2V angle

Biaxial (-) 0° - 30° (gemessen)

Ori­enta­tion

Y ≃ a, Z ≃ b

Dis­per­sion

r > v

Optical Data Luminescence

Color LW-UV (365nm)

 

gelblich weiß

Color SW-UV (254nm)

 

gelblich weiß

Most Common Acti­vator

Mn2+

Other Acti­vators

TiO6, O

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell param­e­ters a (Å)

5.291

Cell param­e­ters b (Å)

9.46

Cell param­e­ters c (Å)

5.29

Cell param­e­ters a/b or c/a

0.559

Cell param­e­ters c/b

0.559

Cell param­e­ters α

98.68°

Cell param­e­ters β

119.9°

Cell param­e­ters γ

85.27°

Z

1

Volumne (ų)

226.9

X-Ray Pow­der Diffrac­tion

9.34(100),
4.66(90),
4.55(30),
3.116(100),
2.595(30),
2.476(60),
1.870(40),
1.527(40)

XRD chart Talc-1A

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

Physical Properties

Hard­ness (Mohs)

1

Density (g/cm³)

2.7 - 2.8 (gemessen) 2.798 (berechnet)

2.775 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen {001}

Tenac­ity

teilbar, flexibel aber nicht elastisch

Radioac­tiv­ity

keine

Preface

Addi­tional Informa­tion

Beim Umgang mit Talkpulver ist Vorsicht geboten. Talk darf nicht eingeatmet werden, da sich in den peripheren Atemwegen durch das feine Pulvers heftige Entzündungen ergeben können - Siehe Quellangabe (Silikose).

References

Zeitschrift für Kristallographie 99 (1938), 264.

Mineralogical Magazine 42 (1978), 107.

Handbook of Mineralogy (Anthony u.w.), 2 (1995), 781.

Steinbruchs-Berufsgenossenschaft - Die Berufskrankheit Silikose

American Mineralogist 89 (2004), 319.

European Journal of Mineralogy 18 (2006), 641.

Zhang, M., Hui, Q., Lou, X.-J., Redfern, A.T., Salje, E.K.H., and Tarantino, S.C. Dehydroxylation, proton migration, and structural changes in heated talc: An infrared spectroscopic study: American Mineralogist (2006) 91, 816-825.

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Talc

Mg3Si4O10(OH)2

monoklin : 2/m : C2/c

9.EC.05

'Talc-1A' (Pol.v. Talc)

Mg3Si4O10(OH)2

triklin : 1 : P1

9.EC.05

Willemseite

(Ni,Mg)3Si4O10(OH)2

monoklin : m : Cc

9.EC.05

Minnesotaite

Fe2+3Si4O10(OH)2

triklin : 1 : P1

9.EC.05

Other languages

English

Talc-1A

German

Talk-1A

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

German pages

DeWikiPedia - search for: Talk-1A
Google-Bilder-Suche - search for: Talk-1A
Mineralogisch-Petrographisches-Institut Hamburg - search for: Talk-1A

English pages

Mindat - search for: Talc-1A
Webmineral - search for:Talc-1A
Handbook-of-Mineralogy - search for: Talc-1A
RRUFF - Raman, XRD and other mineral data - search for: Talc-1A
RRUFF - References and PDF downloads - search for: Talc-1A
American-Mineralogist-Crystal-Structure-Database - search for: Talc-1A
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Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Talk-1A
Crystal-Treasure.com - search for: Talk-1A
Bosse - search for: Talk-1A