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Gerstmannite

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Gerstmannit
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Gerstmannit

farbloses Aggregat von Gerstmannit auf Trägermaterial, Sterling Mine, Ogdensburg, Sussex Co., New Jersey, USA; BB 1 mm
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2022-01-15
Locality: Sterling Mine / Sterling Hill / Ogdensburg / Franklin Mining District / Sussex Co. / New Jersey / USA

Collectors Summary

Color weiß, hellrosa
Streak color weiß
Hardness (Mohs) 4.5
Solubility ++ verdünnte HCl
Crystal System orthorhombisch, Bbcm

Chemism

Chem­ical formula

(Mg,Mn)2ZnSiO4(OH)2

Chem­ical com­po­si­tion

Magnesium, Mangan, Silicium, Zink, Sauerstoff, Wasserstoff

Unit weight: 255.43401895 u; Number of atoms in the formula: 12

Info

Empirical formula:

(Mg0.75Mn0.25)2ZnSiO4(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.79

2

16.67

1.0079470

2.0158940
Oxygen

O

37.58

6

50.00

15.9994300

95.9965800
Magnesium

Mg

14.27

1.5

12.50

24.3050600

36.4575900
Silicon

Si

11.00

1

8.33

28.0855300

28.0855300
Manganese

Mn

10.75

0.5

4.17

54.9380499

27.4690250
Zinc

Zn

25.61

1

8.33

65.4094000

65.4094000

Strunz 9th edi­tion incl. updates

9.AE.25

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
E: Insel(Neso)silikate mit zusätzlichem (O,OH,F,H2O); Kationen in tetrahedralrt [4] und meist größerer Koordination
25:Gerstmannit-Gruppe

Lapis Clas­sifica­tion

VIII/B.03-020

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
3: Kationen in tetraedrischer oder oktaedrischer Koordination [4/6]

Clas­sifica­tion by Hölzel

9.AI.170

9: SILICATES
A: Nesosilicates
I: Nesosilicates with OH
1: C small; Beryllite-Euclase-Topaz-Group

Dana 8th edi­tion

52.02.01.04

52: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
02: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
01: Euclase group

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

weiß, hellrosa

Streak color

weiß

Diaphane­ity (Trans­parency)

durchscheinend bis opak

max. Birefrin­gence

0.013
Birefringence chart\! Gerstmannite title=Birefringence chart Gerstmannite

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

1.665

RI value β

1.675

RI value γ / ε

1.678

Ri mean

1.673

2V angle

Biaxial (-) 55°~

Optical Data Luminescence

Color LW-UV (365nm)

  

grünlich

LW-UV Intensity

extrem schwach

MW-UV (320nm)

  

nicht fluoreszierend

Color SW-UV (254nm)

  

nicht fluoreszierend

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mmm

Space Group number

64

Space Group

Bbcm

Cell param­e­ters a (Å)

8.185

Cell param­e­ters b (Å)

18.65

Cell param­e­ters c (Å)

6.256

Cell param­e­ters a/b or c/a

0.439

Cell param­e­ters c/b

0.335

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

8

Volumne (ų)

954.98

X-Ray Pow­der Diffrac­tion

9.326(80),
4.806(50),
3.418(80),
2.983(60),
2.758(70),
2.598(100),
2.466(50),
2.332(70)
XRD chart Gerstmannite

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)

4.5

VHN (Hard­ness Vick­ers)

280 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.68

3.553 ( ρ calc. Mineralienatlas )

Insta­bil­ity

++ verdünnte HCl

(Co-)Type locality

(Co-)Type locality

USA/New Jersey/Sussex Co./Franklin Mining District/Ogdensburg/Sterling Hill/Sterling Mine

Preface

Author (Name, Year)

Moore & Araki, 1977

References

American Mineralogist 62 (1977), 51

Other languages

German

Gerstmannit

Spanish

Gerstmannita

English

Gerstmannite

French

Gerstmannite

Russian

Герстманнит

CNMNC (IMA)-Number

IMA 1975-030

CNMNC symbol

Symbol

Gmn

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

German pages

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

English pages

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

Russian pages

 Webmineral.ru - search for: Герстманнит

Mineral Dealer

German pages

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

Locations with GPS information