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Griffithite

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Griffithit vom Griffith Park, Los Angeles
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Griffithit vom Griffith Park, Los Angeles (SNr: J4M11)

Griffithit ist eine eisenreiche Varietät von Saponit, auch Ferri-Saponit genannt. Belegstück, Bildbreite ca. 3 mm. Funddatum 1970er-Jahre.

Collection: prospector56
Copyright: prospector56
Contribution: prospector56 2020-11-09
Locality: Griffith Park / Santa Monica Mts. / Los Angeles Co. / Kalifornien (California) / USA

Collectors Summary

Color Meist dunkelgrün bis braun
Crystal System Monoklin,

Additional information / Summary

Griffithit ist eine eisenreiche Varietät von Saponit, auch Ferrisaponit genannt, vorkommend in Basalt-Mandeln.

Chemism

Chem­ical formula

4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) [1]

Empir­ical formula (anal­y­sis)

Mg2.4Fe2+1.2Ca0.4Al1.5Fe3+0.5Si5O18·7(H2O)

Chem­ical com­po­si­tion

Aluminium, Calcium, Eisen, Gold, Magnesium, Silicium, Yttrium, Bor, Fluor, Iod, Kalium, Sauerstoff, Schwefel, Stickstoff, Wasserstoff, Wolfram

Unit weight: 366.1919972 u; Number of atoms in the formula: 21

Info

Empirical formula:

Mg2.4Fe2+1.2Ca0.4Al1.5Fe3+0.5Si5O18·7(H2O)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.93

7

33.33

1.0079470

7.0556290

Oxygen

O

34.95

8

38.10

15.9994300

127.9954400

Magnesium

Mg

6.64

1

4.76

24.3050600

24.3050600

Aluminium

Al

7.37

1

4.76

26.9815382

26.9815382

Silicon

Si

7.67

1

4.76

28.0855300

28.0855300

Calcium

Ca

10.94

1

4.76

40.0784000

40.0784000

Iron

Fe

30.50

2

9.52

55.8452000

111.6904000

IMA sta­tus

Kein anerkanntes Mineral (Varietät)

Var­i­ety / poly­type of

Saponite

Optical Properties

Color

Meist dunkelgrün bis braun

Crystallography

Crystal Sys­tem

Monoklin

Preface

Occurrences

Erscheint in mandelförmigen Hohlräumen in einem Basalt vom Cahuenga-Pass, Griffith Park, Los Angeles, Kalifornien.

External links

Mineralogy Database

References

  • Faust, G.T.: Thermal analysis and x-ray studies of griffithite. J. Wash. Acad. Sci, 45, 66-70 (1955).
  • Roberts, W.L.; Campbell, T.J., & Rapp, G.R. (1974): Encyclopedia of Minerals; S. 248.
  • Dana, E.S. & Ford, W.E.; 4. Aufl. (1949): DANA'S TEXTBOOK OF MINERALOGY, S. 673
  • Ramdohr, P. & Strunz, H. (1978): Klockmanns Lehrbuch der Mineralogie; S. 754
  • Betechtin, A.G.; (Aufl. 1974): Lehrbuch der speziellen Mineralogie; S. 586
  • Fleischer, M. (1975): Glossary of Mineral Species; S. 46 m.w.N.
  • Gebhard, G. (1985): Mineralienlexikon; o.S.

Other languages

German

Griffithit

English

Griffithite

Alternative Name

German

Ferristrontianit

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

German pages

DeWikiPedia - search for: Griffithit
Google-Bilder-Suche - search for: Griffithit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Griffithit

English pages

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

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Griffithit
Crystal-Treasure.com - search for: Griffithit
Bosse - search for: Griffithit

Locations with GPS information