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Pearceite-M2a2b2c (Pearceit-M2a2b2c)

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Pearceit M2a2b2c
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Pearceit M2a2b2c

Ucchucchacua, Peru. 4,4 x 3,7 cm

Copyright: Rob Lavinsky
Contribution: Collector 2009-01-05
Locality: Uchucchacua Mine / Oyon, Provinz / Lima, Region / Peru

Collectors Summary

Lustre Metallglanz
Solubility +++ HNO3
Crystal System monoklin, C2/c

Additional information / Summary

Es sind mehrere Polytypen bekannt

Chemism

Chem­ical formula

[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]

Addi­tional chem. informa­tion

As > Sb – Zelleinheit Typ 222 – alter Name: Arsenpolybasit

Chem­ical com­po­si­tion

Antimon, Arsen, Kupfer, Silber, Schwefel

Unit weight: 2141.069673 u; Number of atoms in the formula: 29

Info

Empirical formula:

[Ag9CuS4][(Ag0.75Cu0.25)6(As0.75Sb0.25)2S7]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Sulfur

S

16.47

11

37.93

32.0655000

352.7205000

Copper

Cu

7.42

2.5

8.62

63.5463000

158.8657500

Arsenic

As

5.25

1.5

5.17

74.9216020

112.3824030

Silver

Ag

68.01

13.5

46.55

107.8682200

1,456.2209700

Antimony

Sb

2.84

0.5

1.72

121.7601000

60.8800500

Strunz 9th edi­tion incl. updates

2.GB.15

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
G: Sulfoarsenide, Sulfoantimonide, Sulfobismuthide
B: Insel(Neso)-Sulfarsenide, usw., mit zusätzlichen Schwefel (S)
15:Pearceit-Polybasit-Gruppe

Clas­sifica­tion by Hölzel

2.GA.362

2: SULFIDES
G: SnS Archetype
A: With Cu,Ag,Fe (without Pb)
3: Pearceite-Polybasite-Group

IMA sta­tus

anerkannt 2006, ehemaliger Name Arsenpolybasit wurde aufgesplittet in Pearceit-M2a2b2c u. Pearceit-T2ac

Min­eral sta­tus

Polytype

Var­i­ety / poly­type of

Pearceite-Tac

Optical Properties

Diaphane­ity (Trans­parency)

opak, durchscheinend

Lus­tre

Metallglanz

RI value α / ω / n

2.72

RI value β

2.72

RI value γ / ε

2.72

Ri mean

2.72

2V angle

Biaxual (-) 22° (gemessen)

Ori­enta­tion

X = c, Y = a, Z = b

Dis­per­sion

sehr stark

Anisotropism

mäßig in reflektiertem Licht

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell param­e­ters a (Å)

26.007

Cell param­e­ters b (Å)

15.015

Cell param­e­ters c (Å)

24.02

Cell param­e­ters a/b or c/a

1.732

Cell param­e­ters c/b

1.6

Cell param­e­ters α

90°

Cell param­e­ters β

90.02°

Cell param­e­ters γ

90°

Volumne (ų)

9379.692

Physical Properties

Insta­bil­ity

+++ HNO3

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

Cupropearceite

[Cu6As2S7][Ag9CuS4]

trigonal : 3m : P3m1

2.GB.15

Cupropolybasite

[Cu6Sb2S7][Ag9CuS4]

trigonal : 3m : P3m1

2.GB.15

'Pearceite-M2a2b2c' (Pol.v. Pearceite-Tac)

[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]

monoklin : 2/m : C2/c

2.GB.15

'Pearceite-T2ac' (Pol.v. Pearceite-Tac)

[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]

trigonal : 32 : P321

2.GB.15

Pearceite-Tac

[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]

trigonal : 3m : P3m1

2.GB.15

Polybasite

(Ag,Cu)16Sb2S11

2.GB.15

'Polybasite-M2a2b2c' (Pol.v. Polybasite)

[Ag9CuS4][(Ag,Cu)6(Sb,As)2S7]

monoklin : 2/m : C2/c

2.GB.15

'Polybasite-T2ac' (Pol.v. Polybasite)

[Ag9CuS4][(Ag,Cu)6(Sb,As)2S7]

trigonal : 32 : P321

2.GB.15

'Polybasite-Tac' (Pol.v. Polybasite)

[Ag9CuS4][(Ag,Cu)6(Sb,As)2S7]

trigonal : 3m : P3m1

2.GB.15

Selenopolybasite

[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]

trigonal : 3m : P3m1

2.GB.15

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

Pearceite-Tac

[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]

trigonal : 3m : P3m1

2.GA.300

Polybasite

(Ag,Cu)16Sb2S11

2.GA.32

'Polybasite-T2ac' (Pol.v. Polybasite)

[Ag9CuS4][(Ag,Cu)6(Sb,As)2S7]

trigonal : 32 : P321

2.GA.320

'Polybasite-M2a2b2c' (Pol.v. Polybasite)

[Ag9CuS4][(Ag,Cu)6(Sb,As)2S7]

monoklin : 2/m : C2/c

2.GA.322

'Polybasite-Tac' (Pol.v. Polybasite)

[Ag9CuS4][(Ag,Cu)6(Sb,As)2S7]

trigonal : 3m : P3m1

2.GA.340

Cupropolybasite

[Cu6Sb2S7][Ag9CuS4]

trigonal : 3m : P3m1

2.GA.345

Cupropearceite

[Cu6As2S7][Ag9CuS4]

trigonal : 3m : P3m1

2.GA.350

Selenopolybasite

[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]

trigonal : 3m : P3m1

2.GA.355

'Pearceite-T2ac' (Pol.v. Pearceite-Tac)

[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]

trigonal : 32 : P321

2.GA.360

'Pearceite-M2a2b2c' (Pol.v. Pearceite-Tac)

[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]

monoklin : 2/m : C2/c

2.GA.362

Fettelite

[Ag6As2S7][Ag10HgAs2S8]

monoklin : 2 : C2

2.GA.370

'Fettelite-T' (Pol.v. Fettelite)

[Ag6As2S7][Ag10HgAs2S8]

trigonal : 3m : P3m1

2.GA.375

Benleonardite

Ag15Cu(Sb,As)2S7Te4

2.GA.380

Larosite

(Cu,Ag)21(Pb,Bi)2S13

2.GA.390

Other languages

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Pearceit-M2a2b2c

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Pearceite-M2a2b2c

Russian

Пирсеит-M2a2b2c

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Locations with GPS information




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