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Boralsilite

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 7
Cleavages prismatisch deutlich, aber die Idizes des Prismas wurden nicht genannt
Fracture nicht genannt
Crystal System monoklin, C2/m

Chemism

Chemical formula

Al16[O5|(BO4)6|(SiO4)2]

Chemical composition

Aluminium, Silicium, Bor, Sauerstoff

Unit weight: 1144.7247812 u; Number of atoms in the formula: 61

Info

Empirical formula:

Al16[O5(BO4)6(SiO4)2]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Boron

B

5.67

6

9.84

10.8117000

64.8702000

Oxygen

O

51.71

37

60.66

15.9994300

591.9789100

Aluminium

Al

37.71

16

26.23

26.9815382

431.7046112

Silicon

Si

4.91

2

3.28

28.0855300

56.1710600

Analysis wt%

SiO2 : 10.50, B2O3 : 18.25, Al2O3 : 71.26 (Ref: berechnet)

Strunz 9th edition incl. updates

9.BD.30

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

Lapis Classification

VIII/B.31-045

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
31: Kationen mit Koordinationszahlen zwischen [8] und [12]; Beryllium- und Bor-Inselsilikate

Classification by Hölzel

9.AK.110

9: SILICATES
A: Nesosilicates
K: Boro and Beryllo Nesosilicates
1: C small; Dumortierite-Kornerupine-Group

Dana 8th edition

56.03.03.01

56: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O
03: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O with [Si2O7] with borate groups

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.025

Birefringence chart\! Boralsilite title=Birefringence chart Boralsilite

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

1.629

RI value β

1.640

RI value γ / ε

1.654

Ri mean

1.641

2V angle

Biaxial (+) 82°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

14.767

Cell parameters b (Å)

5.574

Cell parameters c (Å)

15.079

Cell parameters a/b or c/a

2.649

Cell parameters c/b

2.705

Cell parameters α

90°

Cell parameters β

91.97

Cell parameters γ

90°

Z

2

Volume (ų)

1240.438

X-Ray Powder Diffraction

5.41(70),
5.19(100),
4.95(60),
4.31(70),
3.59(30),
3.378(60),
3.275(30),
2.162(40)

XRD chart Boralsilite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

7

Density (g/cm³)

3.07 (berechnet)

3.065 ( ρ calc. Mineralienatlas )

Cleavages

prismatisch deutlich, aber die Idizes des Prismas wurden nicht genannt

Fracture

nicht genannt

Tenacity

nicht erwähnt

Preface

Author (Name, Year)

Grew & McGee & Yates & Peacor & Rouse & Huijsmans & Shearer & Wiedenbe

References

American Mineralogist 83 (1998), 638

Other languages

German

Boralsilit

Spanish

Boralsilita

French

Boralsilite

English

Boralsilite

Russian

Боралсилит

CNMNC (IMA)-Number

IMA 1996-029

CNMNC symbol

Symbol

Bor

Locations with GPS information

IDs

GUSID (Global unique identifier short form) EzMvD8pTVkC1H_tfY3zJag
GUID (Global unique identifier) 0F2F3313-53CA-4056-B51F-FB5F637CC96A
Database ID 450