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Laphamite (Laphamit)

Additional Functions

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]

Other languages

German

Laphamit

Spanish

Laphamita

English

Laphamite

French

Laphamite

Russian

Лафамит

Japanese

ﾗﾌｧﾏｲﾄ

CNMNC (IMA)-Number

IMA 1985-021

CNMNC symbol

Symbol

Lpm