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Borocookeite

Collectors Summary

Color hellrosa, gelblichgrau
Streak color weiß
Hardness (Mohs) 3
Cleavages vollkommen {001}
Fracture keiner
Crystal System monoklin, C2/m

Chemism

Chemical formula

Li1-1.5Al4-3.5[(OH,F)8|(B,Al)Si3O10]

Chemical composition

Aluminium, Lithium, Silicium, Bor, Fluor, Sauerstoff, Wasserstoff

Unit weight: 510.69952321 u; Number of atoms in the formula: 33.1

Info

Empirical formula:

Li1.3Al3.8[((OH)0.75F0.25)8(B0.75Al0.25)Si3O10]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.18

6

18.13

1.0079470

6.0476820
Lithium

Li

1.77

1.3

3.93

6.9412000

9.0235600
Boron

B

1.59

0.75

2.27

10.8117000

8.1087750
Oxygen

O

50.13

16

48.34

15.9994300

255.9908800
Fluorine

F

7.44

2

6.04

18.9984033

37.9968065
Aluminium

Al

21.40

4.05

12.24

26.9815382

109.2752297
Silicon

Si

16.50

3

9.06

28.0855300

84.2565900

Analysis wt%

SiO2 : 34.19, B2O3 : 4.06, Al2O3 : 41.77, Li2O : 4.65, F : 1.22, H2O : 14.28 (Ref: American Mineralogist 2003)

Strunz 9th edition incl. updates

9.EC.55

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
55:Chlorit Gruppe

Lapis Classification

VIII/H.23-095

VIII: SILIKATE
H: Schichtsilikate
23: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Chlorit-Gruppe

Classification by Hölzel

9.EJ.160

9: SILICATES
E: Phyllosilicates
J: SudoiteChlorite-Group

Dana 8th edition

71.04.01.10

71: Phyllosilicate Minerals
04: Phyllosilicates Phyllosilicate Sheets of Six-Membered Rings interlayered 1:1, 2:1, and octahedra
01: Chlorite group (Tri-Dioctahedral)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Chlorite group

Optical Properties

Color

hellrosa, gelblichgrau

Streak color

weiß

max. Birefringence

0.017
Birefringence chart\! Borocookeite title=Birefringence chart Borocookeite

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

1.574

RI value β

1.580

RI value γ / ε

1.591

Ri mean

1.582

2V angle

Biaxial (+) 72°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

5.110

Cell parameters b (Å)

8.856

Cell parameters c (Å)

14.080

Cell parameters a/b or c/a

0.577

Cell parameters c/b

1.590

Cell parameters α

90°

Cell parameters β

96.93

Cell parameters γ

90°

Z

2

Volume (ų)

632.524

X-Ray Powder Diffraction

14.1(10),
7.05(50),
4.71(70),
3.512(100),
2.807(20),
2.332(10),
2.304(20),
1.946(20)
XRD chart Borocookeite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

3

VHN (Hardness Vickers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.62 (gemessen)

2.681 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}

Fracture

keiner

Tenacity

keine

(Co-)Type locality

(Co-)Type locality

Russland/Sibirien, Föderationskreis/Transbaikalien, Region (Zabaykalsky Krai)/Krasnochikoysky, Rajon/Malkhan Pegmatitfeld (Malchansk; Малханского)/Danburitovaya-Pegmatit/Mokhovaya-Pegmatit

Russland/Sibirien, Föderationskreis/Transbaikalien, Region (Zabaykalsky Krai)/Krasnochikoysky, Rajon/Malkhan Pegmatitfeld (Malchansk; Малханского)/Sosedka-Pegmatit

Preface

Author (Name, Year)

Zakorsky & Peretyazhko & Sapozhnikov & Zhukhlistov & Zvyagin, 2003

References

American Mineralogist 88 (2003), 830

IMA group assignments

Other languages

German

Borocookeit

French

Borocookeite

English

Borocookeite

Spanish

Borocookeíta

Russian

Борокукеит

CNMNC (IMA)-Number

IMA 2000-013

CNMNC symbol

Symbol

Bckt

Locations with GPS information

IDs

GUSID (Global unique identifier short form) s1MWhj0k7ESmg66kD28RFA
GUID (Global unique identifier) 861653B3-243D-44EC-A683-AEA40F6F1114
Database ID 457