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Stevensite (Stevensit)

Pictures (4 Images total)

Stevensit psm. nach Pektolith
Views (File:
1276450409
): 1527
Stevensit psm. nach Pektolith
Größe: 52x30 mm; Fundort: Interstate 80 Roadcut, Paterson, Passaic Co., New Jersey, USA
Copyright: John Sobolewski; Contribution: slugslayer
Location: USA/New Jersey/Passaic Co./Paterson/Interstate 80 Roadcut
Mineral: Stevensite
Image: 1276450409
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Stevensit psm. nach Pektolith

Größe: 52x30 mm; Fundort: Interstate 80 Roadcut, Paterson, Passaic Co., New Jersey, USA
Copyright: John Sobolewski
Contribution: slugslayer 2010-06-13
Locality: Interstate 80 Roadcut / Paterson / Passaic Co. / New Jersey / USA
Stevensit psm. nach Pektolith
Views (File:
1276450105
): 1338
Stevensit psm. nach Pektolith
Größe: 43x24 mm; Fundort: Fort Lee, Bergen Co., New Jersey, USA
Copyright: John Sobolewski; Contribution: slugslayer
Location: USA/New Jersey/Bergen Co./Fort Lee
Mineral: Stevensite
Image: 1276450105
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Stevensit psm. nach Pektolith

Größe: 43x24 mm; Fundort: Fort Lee, Bergen Co., New Jersey, USA
Copyright: John Sobolewski
Contribution: slugslayer 2010-06-13
Locality: Fort Lee / Bergen Co. / New Jersey / USA
Stevensit psm. nach Pektolith
Views (File:
1276450430
): 1482
Stevensit psm. nach Pektolith
Größe: 53x40 mm; Fundort: Interstate 80 Roadcut, Paterson, Passaic Co., New Jersey, USA
Copyright: John Sobolewski; Contribution: slugslayer
Location: USA/New Jersey/Passaic Co./Paterson/Interstate 80 Roadcut
Mineral: Stevensite
Image: 1276450430
License: Usage for Mineralienatlas project only
Stevensit psm. nach Pektolith

Größe: 53x40 mm; Fundort: Interstate 80 Roadcut, Paterson, Passaic Co., New Jersey, USA
Copyright: John Sobolewski
Contribution: slugslayer 2010-06-13
Locality: Interstate 80 Roadcut / Paterson / Passaic Co. / New Jersey / USA
Stevensit
Views (File:
1283687798
): 1496
Stevensit
Größe: 8,9 x 5,9 x 4,4 cm, Fundort: Långban, Filipstad, Värmland, Schweden
Copyright: Rob Lavinsky; Contribution: thdun5
Location: Schweden/Värmland, Provinz/Filipstad, Gemeinde/Långban, Distrikt/Långban Fe-Mn-(Ba-As-Pb-Sb) Lagerstätte
Mineral: Stevensite
Image: 1283687798
License: Usage for Mineralienatlas project only
Stevensit

Größe: 8,9 x 5,9 x 4,4 cm, Fundort: Långban, Filipstad, Värmland, Schweden
Copyright: Rob Lavinsky
Contribution: thdun5 2010-09-05
Locality: Långban Fe-Mn-(Ba-As-Pb-Sb) Lagerstätte / Långban, Distrikt / Filipstad, Gemeinde / Värmland, Provinz / Schweden

Collectors Summary

Color beige weiß, gelbbraun, rosa
Streak color weiß
Hardness (Mohs) 2.5
Solubility +++ HCl
Crystal System monoklin,

Chemism

Chemical formula

(Ca|2)0.3Mg3Si4O10(OH)2

Chemical composition

Calcium, Magnesium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 403.313394 u; Number of atoms in the formula: 21.6

Info

Empirical formula:

(Ca2)0.3Mg3Si4O10(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.50

2

9.26

1.0079470

2.0158940
Oxygen

O

47.60

12

55.56

15.9994300

191.9931600
Magnesium

Mg

18.08

3

13.89

24.3050600

72.9151800
Silicon

Si

27.85

4

18.52

28.0855300

112.3421200
Calcium

Ca

5.96

0.6

2.78

40.0784000

24.0470400

Analysis wt%

SiO2 : 57.30, MgO : 27.47, CaO : 0.97, H2O : 13.86 (Ref: American Mineralogist 59)

Strunz 9th edition incl. updates

9.EC.45

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

Lapis Classification

VIII/H.20-040

VIII: SILIKATE
H: Schichtsilikate
20: Tonminerale, regulär geschichtet; Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Montmorillonit-Gruppe

Classification by Hölzel

9.EI.320

9: SILICATES
E: Phyllosilicates
I: Montmorillonite-Saponite-Group

IMA status

Status fragwürdig

Optical Properties

Color

beige weiß, gelbbraun, rosa

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.024
Birefringence chart\! Stevensite title=Birefringence chart Stevensite

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

1.521

RI value β

1.525

RI value γ / ε

1.545

Ri mean

1.530

2V angle

Biaxial (+) 35°!

Optical Data Luminescence

Color LW-UV (365nm)

  

gelblich weiß

Color SW-UV (254nm)

  

gelblich weiß

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

monoklin

Cell parameters a (Å)

5.4

Cell parameters b (Å)

9.1

Cell parameters c (Å)

15.3

Cell parameters a/b or c/a

0.593

Cell parameters c/b

1.681

Cell parameters α

90°

Cell parameters β

97°a

Cell parameters γ

90°

Z

2

Volumne (ų)

746.238

X-Ray Powder Diffraction

26.5(20),
12.7(100),
4.54(60),
3.18(30),
2.55(100),
2.28(10),
1.520(40),
1.306(20)
XRD chart Stevensite

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

Physical Properties

Hardness (Mohs)

2.5

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.15 - 2.75 / Durchschnittlich = 2.45

1.795 ( ρ calc. Mineralienatlas )

Instability

+++ HCl

(Co-)Type locality

(Co-)Type locality

USA/New Jersey/Hudson Co./Hoboken/Bergen Hill

Preface

Author (Name, Year)

Leeds, 1873

References

American Mineralogist 44 (1959), 342

Other languages

German

Stevensit

Spanish

Stevensita

French

Stevensite

English

Stevensite

Russian

Стевенсит

Russian

Стивенсит

Alternative Name

Spanish

Afrodita

Afrodite

German

Aphrodit

Spanish

Aphrodita

Aphrodite

CNMNC symbol

Symbol

Stv

Locations with GPS information