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Kellyite

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Kellyit
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Kellyit
bräunliche Aggregate von Kellyit, Bald Knob, Sparta, Alleghany County, North Carolina, USA; BB ~ 1 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: USA/North Carolina/Alleghany Co./Sparta/Bald Knob
Mineral: Kellyite
Image: 1592423528
License: Usage for Mineralienatlas project only
Kellyit

bräunliche Aggregate von Kellyit, Bald Knob, Sparta, Alleghany County, North Carolina, USA; BB 1 mm
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-06-17
Locality: Bald Knob / Sparta / Alleghany Co. / North Carolina / USA

Collectors Summary

Color goldgelb, zitronengelb
Streak color gelblich weiß
Hardness (Mohs) 2.5
Crystal System hexagonal, P63

Chemism

Chemical formula

(Mn2+,Mg,Al)3(Si,Al)2O5(OH)4

Chemical composition

Aluminium, Magnesium, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 332.50322738 u; Number of atoms in the formula: 18

Info

Empirical formula:

(Mn0.6Mg0.3Al0.1)3(Si0.75Al0.25)2O5(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.21

4

22.22

1.0079470

4.0317880
Oxygen

O

43.31

9

50.00

15.9994300

143.9948700
Magnesium

Mg

6.58

0.9

5.00

24.3050600

21.8745540
Aluminium

Al

6.49

0.8

4.44

26.9815382

21.5852306
Silicon

Si

12.67

1.5

8.33

28.0855300

42.1282950
Manganese

Mn

29.74

1.8

10.00

54.9380499

98.8884898

Analysis wt%

SiO2 : 17.60, Al2O3 : 28.55, Fe2O3 : 2.18, MnO : 38.84, MgO : 2.97, H2O : 10.82 (Ref: American Mineralogist 74)

Strunz 9th edition incl. updates

9.ED.15

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
D: Schichtsilikate (Phyllosilikate) mit [Kaolinit]-Schichten, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
15:Serpentin-Gruppe

Lapis Classification

VIII/H.27-110

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

Classification by Hölzel

9.EM.330

9: SILICATES
E: Phyllosilicates
M: Serpentine-Group
3: Lizardite-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Kaolinite-Serpentine Group  ⇒ Serpentine subgroup

Optical Properties

Color

goldgelb, zitronengelb

Streak color

gelblich weiß

Diaphaneity (Transparency)

transparent

max. Birefringence

0.007
Birefringence chart\! Kellyite title=Birefringence chart Kellyite

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

1.639

RI value γ / ε

1.646

Ri mean

1.641

2V angle

Biaxial (-) 23°!

Crystallography

Crystal System

hexagonal

Class (H-M)

6

Space Group number

173

Space Group

P63

Cell parameters a (Å)

5.438

Cell parameters b (Å)

-

Cell parameters c (Å)

14.04

Cell parameters a/b or c/a

2.582

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volume (ų)

359.564

X-Ray Powder Diffraction

7.0(90),
3.51(100),
2.67(40),
2.53(60),
2.34(40),
2.15(10),
1.954(30),
1.570(30)
XRD chart Kellyite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.5

Density (g/cm³)

3.07

3.071 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

USA/North Carolina/Alleghany Co./Sparta/Bald Knob

Preface

Author (Name, Year)

Peacor & Essene & Simmons & Bigelow, 1974

References

American Mineralogist 59 (1974), 1153

IMA group assignments

 
Kaolinite-Serpentine Group
 
 
 

 
 
Serpentine subgroup
 
monoklin
 

 
 
 
Amesite
Mg2Al(SiAl)O5(OH)4
triklin
C1

 
 
 
Antigorite
(Mg,Fe2+)3Si2O5(OH)4
monoklin
Cm

 
 
 
Berthierine
(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
monoklin
C2/m

 
 
 
Brindleyite
(Ni,Mg,Fe2+)2Al(SiAl)O5(OH)4
monoklin
 

 
 
 
Caryopilite
Mn2+3Si2O5(OH)4
monoklin
Cm

 
 
 
Chrysotile
Mg3Si2O5(OH)4
 
 

 
 
 
Cronstedtite
Fe22+Fe3+(SiFe3+)O5(OH)4
trigonal
P31m

 
 
 
Fraipontite
(Zn,Al)3(Si,Al)2O5(OH)4
monoklin
 

 
 
 
Guidottiite
Mn2Fe3+(SiFe3+)O5(OH)4
hexagonal
P63

 
 
 
Kellyite
(Mn2+,Mg,Al)3(Si,Al)2O5(OH)4
hexagonal
P63

 
 
 
Lizardite
Mg3Si2O5(OH)4
monoklin
Cm

 
 
 
Népouite
(Ni,Mg)3Si2O5(OH)4
orthorhombisch
Ccm21

 
 
 
Pecoraite
Ni3Si2O5(OH)4
monoklin
 

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Actuality: 27. Nov 2024 - 02:24:29

Other languages

German

Kellyit

French

Kellyite

English

Kellyite

Spanish

Kellyíta

Simplified Chinese

锰铝蛇纹石

CNMNC (IMA)-Number

IMA 1974-002

CNMNC symbol

Symbol

Kly

Locations with GPS information

IDs

GUSID (Global unique identifier short form) FHrs153FkkiqI9SMELntbw
GUID (Global unique identifier) D7EC7A14-C59D-4892-AA23-D48C10B9ED6F
Database ID 1914