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Weissite

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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 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

Volumne (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

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

Weissite

Cu2-xTe {x ≈ 0.21}

hexagonal : 6/mmm : P6/mmm

2.BA.30

Rickardite

Cu3-xTe2

orthorhombisch : mmm : Pmmn

2.BA.30

'Argentite' (Var.v. Acanthite)

ß-Ag2S

kubisch : m3m : Im3m

2.BA.30a

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

Weissite

Cu2-xTe {x ≈ 0.21}

hexagonal : 6/mmm : P6/mmm

II/B.04-010

Rickardite

Cu3-xTe2

orthorhombisch : mmm : Pmmn

II/B.04-020

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

Berzelianite

Cu2Se

kubisch : m3m : Fm3m

2.BA.200

Bellidoite

Cu2Se

tetragonal : 4/m, : P42/n,

2.BA.210

Umangite

Cu3Se2

tetragonal : 42m : P421m

2.BA.220

Athabascaite

Cu5Se4

2.BA.230

Weissite

Cu2-xTe {x ≈ 0.21}

hexagonal : 6/mmm : P6/mmm

2.BA.250

Rickardite

Cu3-xTe2

orthorhombisch : mmm : Pmmn

2.BA.260

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

Acanthite

Ag2S

monoklin : 2/m : P21/n

02.04.01.01

Naumannite

Ag2Se

orthorhombisch : 222 : P212121

02.04.01.02

Aguilarite

Ag4SeS

02.04.01.03

Hessite

Ag2Te

monoklin : 2/m : P21/c

02.04.02.01

Cervelleite

Ag4TeS

monoklin : 2/m : P21/n

02.04.02.02

Uytenbogaardtite

Ag3AuS2

trigonal : 3m : R3c

02.04.03.01

Fischesserite

Ag3AuSe2

kubisch : 432 : I4132

02.04.03.02

Petzite

Ag3AuTe2

kubisch : 432 : I4132

02.04.03.03

Jalpaite

Ag3CuS2

tetragonal : 4/mmm : I41/amd

02.04.04.01

Selenojalpaite

Ag3CuSe2

tetragonal : 4/mmm : I41/amd

02.04.04.02

Mckinstryite

Ag5Cu3S4

orthorhombisch : mmm, mm2 : Pnma

02.04.05.01

Stromeyerite

AgCuS

orthorhombisch : mm2 : Cmc21

02.04.06.01

Eucairite

CuAgSe

orthorhombisch : mmm : Pmmn

02.04.06.02

Chalcocite

Cu2S

monoklin : 2/m : P21/c

02.04.07.01

Djurleite

Cu31S16

monoklin : 2/m : P21/n

02.04.07.02

Digenite

Cu1.8S

trigonal : 3m : R3m

02.04.07.03

Roxbyite

Cu58S32

triklin : 1 : P1

02.04.07.04

Anilite

Cu7S4

orthorhombisch : mmm : Pnma

02.04.07.05

Geerite

Cu8S5

trigonal : 32, 3m, 3m : R32, R3m, R3m

02.04.07.06

Spionkopite

Cu39S28

trigonal : 3m, 32, 3m : P3m1, P321, P3m1

02.04.07.07

Weissite

Cu2-xTe {x ≈ 0.21}

hexagonal : 6/mmm : P6/mmm

02.04.08.01

Bellidoite

Cu2Se

tetragonal : 4/m, : P42/n,

02.04.09.01

Alternative Name

Weissite (of Crawford)

Simplified Chinese

韦氏碲铜矿

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

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