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Weissite (Weissit)

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Weissit
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Weissit
schwarzes Aggregat von Weissit neben Quarz und unbestimmten blauen Kristallen (Linarit?), Winston, Sierra County, New Mexico, USA; BB ~ 1 mm
Copyright: Joy Desor; Contribution: openpit
Location: USA/New Mexico/Sierra Co./Winston
Mineral: Weissite
Image: 1591800407
License: Usage for Mineralienatlas project only
Weissit

schwarzes Aggregat von Weissit neben Quarz und unbestimmten blauen Kristallen (Linarit?), Winston, Sierra County, New Mexico, USA; BB 1 mm

Copyright: Joy Desor
Contribution: openpit 2020-06-10
Locality: Winston / Sierra Co. / New Mexico / USA

Collectors Summary

Color bläulichschwarz-met.
Streak color schwarz
Lustre Metallglanz
Hardness (Mohs) 3
Fracture uneben
Solubility +++ HNO3
Crystal System hexagonal, P6/mmm

Chemism

Chemical formula

Cu2-xTe {x ≈ 0.21}

Empirical formula (analysis)

(Cu1.62Ag0.04Au0.04Fe0.04Sb0.04)(Te0.96S0.02Se0.02)

Chemical composition

Kupfer, Tellur

Unit weight: 246.96205888 u; Number of atoms in the formula: 2.78

Info

Empirical formula:

(Cu1.62Ag0.04Au0.04Fe0.04Sb0.04)(Te0.96S0.02Se0.02)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Sulfur

S

0.26

0.02

0.72

32.0655000

0.6413100

Iron

Fe

0.90

0.04

1.44

55.8452000

2.2338080

Copper

Cu

41.68

1.62

58.27

63.5463000

102.9450060

Selenium

Se

0.64

0.02

0.72

78.9630000

1.5792600

Silver

Ag

1.75

0.04

1.44

107.8682200

4.3147288

Antimony

Sb

1.97

0.04

1.44

121.7601000

4.8704040

Tellurium

Te

49.60

0.96

34.53

127.6030000

122.4988800

Gold

Au

3.19

0.04

1.44

196.9665520

7.8786621

Analysis wt%

Te : 53.97, Cu : 45.84 (Ref: Dana, 7th ed. 1)

Strunz 9th edition incl. updates

2.BA.30

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
B: Metallsulfide, M : S > 1 : 1 (hauptsächlich 2 : 1)
A: mit Kupfer (Cu), Silber (Ag), Gold (Au)
30:Rickardit-Gruppe

Lapis Classification

II/B.04-010

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
B: Sulfide, Selenide und Telluride mit Verhältnis Metall : S,Se,Te > 1:1
4: Selenide mit Kupfer vorherrschend

Classification by Hölzel

2.BA.250

2: SULFIDES
B: Sulfides (etc) with Me/S > 1/1 (mostly 2/1)
A: With Cu,Ag,Au
2: Berzelianite-Weissit-Group

Dana 8th edition

02.04.08.01

02: Sulfide Minerals
04: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=2:1

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

bläulichschwarz-met.

Streak color

schwarz

Diaphaneity (Transparency)

opak

Lustre

Metallglanz

Pleochroism

ausgeprägt

Anisotropism

ausgeprägt

Reflectivity: (Lambda nm) ↓, ↑, Ø

(471.1) 37.0, 38.4, 37.70
(548.3) 33.2, 34.2, 33.70
(586.6) 31.2, 32.1, 31.65
(652.3) 28.6, 31.0, 29.80

Reflection chart Weissite

Reflectivity Ø

33.21

Crystallography

Crystal System

hexagonal

Class (H-M)

6/mmm

Space Group number

191

Space Group

P6/mmm

Cell parameters a (Å)

8.3124

Cell parameters b (Å)

-

Cell parameters c (Å)

21.546

Cell parameters a/b or c/a

2.592

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

24

Volume (ų)

1289.289

X-Ray Powder Diffraction

7.18(50),
3.62(90),
3.23(100),
2.53(30),
2.26(20),
2.04(90),
1.992(80),
1.798(30)

XRD chart Weissite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3

VHN (Hardness Vickers)

152 (100g)

Density (g/cm³)

7.383 (berechnet)

7.633 ( ρ calc. Mineralienatlas )

Fracture

uneben

Instability

+++ HNO3

(Co-)Type locality

(Co-)Type locality

USA/Colorado/Gunnison Co./Vulcan District/Good Hope Mine

Type material

National Museum of Natural History, Washington, D.C., USA

Collection number of type material

95782

Preface

Name from

Louis Weiss, dem Besitzer der Good Hope Mine und dem Finder von Rickardit

Author (Name, Year)

Crawford, 1927

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: H301: Giftig bei Verschlucken., H332: Gesundheitsschädlich bei Einatmen., P261: Einatmen von Staub / Rauch / Gas / Nebel / Dampf / Aerosol vermeiden., P301+P310: Bei Verschlucken: Sofort Giftinformationszentrum, Arzt oder … anrufen., P304+P340: Bei Einatmen: Die Person an die frische Luft bringen und für ungehinderte Atmung sorgen., P312: Bei Unwohlsein Giftinformationszentrum, Arzt oder … anrufen., P405: Unter Verschluss aufbewahren., P501: Inhalt / Behälter … zuführen.

References

Handbook of Mineralogy (Anthony et al.), 1 (1990), 573

Lehrbuch der Mineralogie/Rösler (1991)

American Journal of Science 13 (1927), 345

Mineralogical Magazine 77 (2013), 475

Other languages

German

Weissit

Spanish

Weissita

French

Weissite

English

Weissite

Russian

Вейссит

Simplified Chinese

黑碲铜矿

Japanese

ワイス鉱(廃名) 

Alternative Name

Weissite (of Crawford)

Simplified Chinese

韦氏碲铜矿

CNMNC symbol

Symbol

Wst

Locations with GPS information

IDs

GUSID (Global unique identifier short form) rBXSZXS2c0uMGZ7fgMvw1Q
GUID (Global unique identifier) 65D215AC-B674-4B73-8C19-9EDF80CBF0D5
Database ID 4143