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Bertrandite (Bertrandit)

Pictures (144 Images total)

Bertrandit
Views (Image: 1553871114): 562
Bertrandit

Österreich, Rauristal, Neubau, BB 4mm

Collection: Georg Prock
Copyright: Georg Prock
Contribution: Gepro 2019-03-29
Locality: Neubau Naturfreundehaus / Kolm-Saigurn / Raurisertal / Rauris / Zell am See, Bezirk (Pinzgau) / Salzburg / Österreich
Bertrandit
Views (Image: 1554122794): 539
Bertrandit

Österreich, Rauristal, Neubau, BB 3mm

Collection: Georg Prock
Copyright: Georg Prock
Contribution: Gepro 2019-04-01
Locality: Neubau Naturfreundehaus / Kolm-Saigurn / Raurisertal / Rauris / Zell am See, Bezirk (Pinzgau) / Salzburg / Österreich
Bertrandit
Views (Image: 1437457986): 476
Bertrandit

Bärenfallstaumauer, Gasteiner Tal, Österreich, Bildbreite 2 mm

Collection: Kainosit
Copyright: Kainosit
Contribution: Kainosit 2015-07-21
Locality: Bärenfallstaumauer / Naßfeld / Böckstein / Bad Gastein / Gasteinertal / St. Johann im Pongau, Bezirk / Salzburg / Österreich
Bertrandit
Views (Image: 1478282345): 397
Bertrandit

Tittling, Matzersdorf, Krennbruch, Bildbreite 4mm

Collection: Georg Prock
Copyright: Georg Prock
Contribution: Gepro 2016-11-04
Locality: Krennbruch / Matzersdorf / Saldenburg / Freyung-Grafenau, Landkreis / Niederbayern, Bezirk / Bayern / Deutschland
Bertrandit
Views (Image: 1287396281): 4472
Bertrandit

Größe: 0,94 mm; Fundort: Golconda-Pegmatit, Governador Valadares, Minas Gerais, Brasilien

Collection: Domenico Preite
Copyright: Matteo Chinellato
Contribution: Hg 2010-10-18
Locality: Golconda-Pegmatit / Governador Valadares / Doce-Tal / Minas Gerais / Südosten (Região Sudeste) / Brasilien
Bertrandit
Views (Image: 1264079549): 3757
Bertrandit

Bildbreite: 1,8 mm; Fundort: Monte Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola, Piemont (Piemonte), Italien

Copyright: Matteo Chinellato
Contribution: Hg 2010-01-21
Locality: Monte Camoscio / Oltrefiume / Baveno / Verbano-Cusio-Ossola, Provinz / Piemont (Piemonte), Region / Italien

Collectors Summary

Color farblos, blass gelb
Streak color weiß
Lustre Glasglanz Perlmuttglanz
Hardness (Mohs) 6.5
Solubility +++ HF, - andere Säuren
Crystal System orthorhombisch, Cmc21

Chemism

Chem­ical formula

Be4Si2O7(OH)2

Chem­ical com­po­si­tion

Beryllium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 238.2305532 u; Number of atoms in the formula: 17

Info

Empirical formula:

Be4Si2O7(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.85

2

11.76

1.0079470

2.0158940

Beryllium

Be

15.13

4

23.53

9.0121823

36.0487292

Oxygen

O

60.44

9

52.94

15.9994300

143.9948700

Silicon

Si

23.58

2

11.76

28.0855300

56.1710600

Anal­y­sis wt%

SiO2 : 49.90, BeO : 42.62, H2O : 7.94 (Ref: American Mineralogist 36)

Strunz 9th edi­tion incl. updates

9.BD.05

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
D: Si2O7 Gruppen mit zusätzlichen Anionen; Kationen in tetrahedraler [4] und/oder anderer Koordination
05:Bertrandit-Gruppe

Lapis Clas­sifica­tion

VIII/C.07-010

VIII: SILIKATE
C: Gruppensilikate
7: Gruppensilikate [Si2O7] 6-, mit tetraederfremden Anionen (O,OH,F)

Clas­sifica­tion by Hölzel

9.BC.100

9: SILICATES
B: Sorosilicates
C: Bertrandite-Hemimorphite-Group

Dana 8th edi­tion

56.01.01.01

56: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O
01: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O with cations in [4] coordination

IMA sta­tus

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos, blass gelb

Streak color

weiß

Diaphane­ity (Trans­parency)

durchscheinend bis transparent

Lus­tre

Glasglanz Perlmuttglanz

max. Birefrin­gence

0.024

Birefringence chart\! Bertrandite title=Birefringence chart Bertrandite

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

1.590

RI value β

1.605

RI value γ / ε

1.614

Ri mean

1.603

2V angle

Biaxial (-) 74°

Optical Data Luminescence

Lumi­nes­cence

keine Fluoreszenz bekannt

Color LW-UV (365nm)

 

grün

Color SW-UV (254nm)

 

grün

LW-UV Other Col­ors

 

rosa

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

orthorhombisch

Class (H-M)

mm2

Space Group number

36

Space Group

Cmc21

Cell param­e­ters a (Å)

8.721

Cell param­e­ters b (Å)

15.26

Cell param­e­ters c (Å)

4.568

Cell param­e­ters a/b or c/a

0.571

Cell param­e­ters c/b

0.299

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

607.921

Kristall struc­ture

Gruppen aus zwei SiO4 Tetreader

X-Ray Pow­der Diffrac­tion

4.38(100),
3.94(40),
3.19(90),
2.54(80),
2.28(60),
2.22(60),
1.555(30),
1.305(40)

XRD chart Bertrandite

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)

6.5

VHN (Hard­ness Vick­ers)

960 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.59 - 2.6 / Durchschnittlich = 2.59

2.603 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ HF, - andere Säuren

Chem­ical Prop­er­ties and Tests

vor dem Lötrohr nicht schmelzbar

Preface

Gen­er­a­tion con­di­tions

1.in SiO2 reichen Vulkaniten
2.in hydrothermalen Nachphasen
3.in alkalischen Gesteinen
4.selten in Zinnerzen
5.Entstehung von Lagerstätten bei hydrothermaler Durchdringung

Name from

dem franz. Mineralogen E. Bertrand

Author (Name, Year)

Damour, 1883

References

Physics and Chemistry of Minerals 13 (1986), 69

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

Bertrandite

Be4Si2O7(OH)2

orthorhombisch : mm2 : Cmc21

9.BD.05

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

Bertrandite

Be4Si2O7(OH)2

orthorhombisch : mm2 : Cmc21

VIII/C.07-010

Hemimorphite

Zn4Si2O7(OH)2·H2O

orthorhombisch : mm2 : Imm2

VIII/C.07-020

Junitoite

CaZn2Si2O7·H2O

orthorhombisch : mm2 : Ama2

VIII/C.07-030

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

Bertrandite

Be4Si2O7(OH)2

orthorhombisch : mm2 : Cmc21

9.BC.100

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Bertrandite

Be4Si2O7(OH)2

orthorhombisch : mm2 : Cmc21

56.01.01.01

Hemimorphite

Zn4Si2O7(OH)2·H2O

orthorhombisch : mm2 : Imm2

56.01.02.01

Other languages

German

Bertrandit

Spanish

Bertrandita

French

Bertrandite

English

Bertrandite

Russian

Бертрандит

Simplified Chinese

羟硅铍石

Traditional Chinese

羥矽鈹石

Alternative Name

Gel-Betrandite

German

Hessenbergit

Hessenbergite

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Бертрандит

Mineral Dealer

German pages

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

Locations with GPS information




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