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Laphamite

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Laphamit
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Laphamit

Bildbreite: 1,5 mm; Fundort: Burnside, Northumberland Co., Pennsylvania, USA

Copyright: Christian Rewitzer
Contribution: Hg 2008-05-27
Locality: Burnside / Northumberland Co. / Pennsylvania / USA

Collectors Summary

Color grau-weiß, stark feurig roten internen Reflektionen, goldgelb bei Kratzern
Streak color rot orange
Hardness (Mohs) 1.5
Crystal System monoklin, P21/n

Chemism

Chem­ical formula

As2Se3

Chem­ical com­po­si­tion

Arsen, Selen

Unit weight: 386.732204 u; Number of atoms in the formula: 5

Info

Empirical formula:

As2Se3

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Arsenic

As

38.75

2

40.00

74.9216020

149.8432040

Selenium

Se

61.25

3

60.00

78.9630000

236.8890000

Anal­y­sis wt%

As : 47.00, Se : 43.70, S : 8.70 (Ref: Mineralogical Magazine 86)

Strunz 9th edi­tion incl. updates

2.FA.30

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
F: Sulfide, Arsenide, Alkaide; Sulfide mit Halogeniden, Oxiden, Hydroxiden (H2O)
A: mit As, (Sb), S
30:Auripigment-Gruppe

Lapis Clas­sifica­tion

II/F.02-080

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
F: Sulfide mit nichtmetallischem Charakter
2: Arsen-Sulfide

Clas­sifica­tion by Hölzel

2.KA.240

2: SULFIDES
K: Nonmetallic Sulfides, HalideSulfides, etc.
A: With As,Sb,V
2: Orpiment-Group

Dana 8th edi­tion

02.11.06.01

02: Sulfide Minerals
11: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=2:3

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

grau-weiß, stark feurig roten internen Reflektionen, goldgelb bei Kratzern

Streak color

rot orange

Diaphane­ity (Trans­parency)

durchscheinend bis teilweise opak

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/n

Cell param­e­ters a (Å)

11.86

Cell param­e­ters b (Å)

9.756

Cell param­e­ters c (Å)

4.265

Cell param­e­ters a/b or c/a

1.216

Cell param­e­ters c/b

0.437

Cell param­e­ters α

90°

Cell param­e­ters β

90.17

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

493.485

X-Ray Pow­der Diffrac­tion

4.87(70),
3.72(40),
2.905(60),
2.833(100),
2.773(80),
2.516(40),
1.777(50),
1.709(50)

XRD chart Laphamite

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)

1.5

VHN (Hard­ness Vick­ers)

18 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.5

5.205 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

USA/Pennsylvania/Northumberland Co./Burnside

Preface

Author (Name, Year)

Dunn & Peacor & Criddle & Finkelman, 1986

References

Mineralogical Magazine 50 (1986), 279

CNMNC Newsletter No. 50; Mineralogical Magazine, 31 [Formel]

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

Laphamite

As2Se3

monoklin : 2/m : P21/n

2.FA.30

Anorpiment

As2S3

triklin : 1 : P1

2.FA.30

Orpiment

As2S3

monoklin : 2/m : P21/n

2.FA.30

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

Duranusite

As4S

II/F.02-010

Dimorphite

As4S3

orthorhombisch : mmm : Pnma

II/F.02-020

Bonazziite

As4S4

monoklin : 2/m : C2/c

II/F.02-025

Realgar

AsS

monoklin : 2/m : P21/n

II/F.02-030

Pararealgar

AsS

monoklin : 2/m : P21/c

II/F.02-040

Alacránite

As8S9

monoklin : 2/m : P2/c

II/F.02-050

Uzonite

As4S5

monoklin : 2/m : P21/m

II/F.02-060

Anorpiment

As2S3

triklin : 1 : P1

II/F.02-065

Orpiment

As2S3

monoklin : 2/m : P21/n

II/F.02-070

Laphamite

As2Se3

monoklin : 2/m : P21/n

II/F.02-080

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

Orpiment

As2S3

monoklin : 2/m : P21/n

2.KA.200

Anorpiment

As2S3

triklin : 1 : P1

2.KA.210

Getchellite

AsSbS3

monoklin : 2/m : P21/a

2.KA.220

Laphamite

As2Se3

monoklin : 2/m : P21/n

2.KA.240

Wakabayashilite

[(As,Sb)6S9][As4S5]

orthorhombisch : mm2 : Pna21

2.KA.270

'Jeromite'

As(S,Se)2

amorph

2.KA.280

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

Orpiment

As2S3

monoklin : 2/m : P21/n

02.11.01.01

Getchellite

AsSbS3

monoklin : 2/m : P21/a

02.11.01.02

Stibnite

Sb2S3

orthorhombisch : mmm : Pbnm

02.11.02.01

Antimonselite

Sb2Se3

orthorhombisch : mmm : Pbnm

02.11.02.02

Bismuthinite

Bi2S3

orthorhombisch : mmm : Pbnm

02.11.02.03

Guanajuatite

Bi2Se3

orthorhombisch : mmm : Pbnm

02.11.02.04

Metastibnite

Sb2S3

amorph

02.11.03.01

Wakabayashilite

[(As,Sb)6S9][As4S5]

orthorhombisch : mm2 : Pna21

02.11.04.01

Pääkkönenite

Sb2AsS2

monoklin : 2/m : C2/m

02.11.05.01

Laphamite

As2Se3

monoklin : 2/m : P21/n

02.11.06.01

Tetradymite

Bi2Te2S

trigonal : 3m : R3m

02.11.07.01

Tellurobismuthite

Bi2Te3

02.11.07.02

Tellurantimony

Sb2Te3

trigonal : 3m : R3m

02.11.07.03

Paraguanajuatite

Bi2(Se,S)3

trigonal : 3m : R3m

02.11.07.04

Kawazulite

Bi2(Te,Se,S)3

trigonal : 3m : R3m

02.11.07.05

Skippenite

Bi2Se2(Te,S)

trigonal : 3m : R3m

02.11.07.06

Montbrayite

(Au,Ag,Sb,Bi,Pb)23(Te,Sb,Bi,Bi,Pb)38

triklin : 1 : P1

02.11.08.01

Ottemannite

Sn2S3

orthorhombisch : mmm : Pnam

02.11.09.01

CNMNC (IMA)-Number

IMA 1985-021

CNMNC symbol

Symbol

Lpm

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

German pages

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