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Sphaerobertrandite

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Sphaerobertrandit
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Sphaerobertrandit

Radial angeordnete, blättrige und cremeweiß gefärbte Kristalle von Sphaerobertrandit. Fundort: Berg Sengischorr, Lovozersky Distr., Murmansk Oblast, Russland. Bildbreite 4mm.

Collection: Yi Sun
Copyright: Yi Sun
Contribution: sun-mineral 2019-09-14
Locality: Sengischorr / Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color farblos, beigeweiß, blassgelb, blassbraun
Streak color weiß
Hardness (Mohs) 5
Cleavages vollkommen {001}
Fracture uneben
Crystal System monoklin, P21/c

Chemism

Chem­ical formula

Be3[(OH)2|SiO4]

Chem­ical com­po­si­tion

Beryllium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 153.1345509 u; Number of atoms in the formula: 12

Info

Empirical formula:

Be3[(OH)2SiO4]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.32

2

16.67

1.0079470

2.0158940

Beryllium

Be

17.66

3

25.00

9.0121823

27.0365469

Oxygen

O

62.69

6

50.00

15.9994300

95.9965800

Silicon

Si

18.34

1

8.33

28.0855300

28.0855300

Anal­y­sis wt%

SiO2 : 41.03, Al2O3 : 1.40, BeO : 45.20, H2O : 12.00 (Ref: TrudyIMGRE,1957)

Strunz 9th edi­tion incl. updates

9.AE.50

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

Lapis Clas­sifica­tion

VIII/B.01-025

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

Clas­sifica­tion by Hölzel

9.AI.110

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

Dana 8th edi­tion

52.01.02.01

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

IMA sta­tus

Neudefinition von der CNMNC anerkannt

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos, beigeweiß, blassgelb, blassbraun

Streak color

weiß

max. Birefrin­gence

0.016

Birefringence chart\! Sphaerobertrandite title=Birefringence chart Sphaerobertrandite

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

1.597

RI value β

1.607

RI value γ / ε

1.613

Ri mean

1.606

2V angle

Biaxial (-) 70°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell param­e­ters a (Å)

5.081

Cell param­e­ters b (Å)

4.639

Cell param­e­ters c (Å)

17.664

Cell param­e­ters a/b or c/a

1.095

Cell param­e­ters c/b

3.808

Cell param­e­ters α

90°

Cell param­e­ters β

106.8

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

398.584

X-Ray Pow­der Diffrac­tion

4.885(90),
4.236(60),
3.781(50),
3.161(100),
2.836(70),
2.538(50),
2.318(90),
2.174(50)

XRD chart Sphaerobertrandite

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)

5

VHN (Hard­ness Vick­ers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.52 (berechnet)

2.552 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen {001}

Frac­ture

uneben

Tenac­ity

spröde

Preface

Author (Name, Year)

Semenov, 1957

References

European Journal of Mineralogy 15 (2003), 157

Other languages

Spanish

Esferobertrandita

German

Sphaerobertrandit

French

Sphaerobertrandite

English

Sphaerobertrandite

Russian

Сферобертрандит

Simplified Chinese

球羟硅铍石

Traditional Chinese

球羥矽鈹石

Alternative Name

Spanish

Sphaerobertrandita

CNMNC symbol

Symbol

Sbtd

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

German pages

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

English pages

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

Russian pages

Webmineral.ru - search for: Сферобертрандит

Mineral Dealer

German pages

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

Locations with GPS information