Berryite Mineral Data

Berryite Mineral Data +

General Berryite Information

Chemical Formula:

Pb3(Ag,Cu)5Bi7S16

Composition:

Molecular Weight = 3,026.05 gm

Copper 5.25 % Cu

Silver 8.91 % Ag

Bismuth 48.34 % Bi

Lead 20.54 % Pb

Sulfur 16.95 % S

______

100.00 %

Empirical Formula:

Pb₃Ag_2.5Cu_2.5Bi₇S₁₆

Environment:

In quartz veins with other sulfides and sulfosalts, and in siderite-rich cryolite.

IMA Status:

Approved IMA 1966

Locality:

From the Missouri mine, Park Co., and the Mike mine, San Juan Co., Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

For Professor Leonard Gascoigne Berry (1914-1982), mineralogist, Queen's University, Toronto, Canada, who obtained the first X-ray powder pattern of the mineral.

Synonym:

IMA1965-013

Berryite Image

Images:

Berryite Aikinite

Comments: Fine-grained, gray, metallic granular berryite with silvery, metallic, prismatic aikinite.
Location: Mike Mine, San Juan County, Colorado. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Berryite Crystallography

Axial Ratios:

a:b:c =3.1601:1:7.1922

Cell Dimensions:

a = 12.707, b = 4.021, c = 28.92, Z = 2; beta = 102.6° V = 1,442.08 Den(Calc)= 6.97

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.47(1), 2.89(0.8), 2.8(0.7),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Topa D , Makovicky E , Putz H , Mumme W G , The Canadian Mineralogist , 44 (2006) p.465-480, The crystal structure of berryite, Cu3Ag2Pb3Bi7S16, Locality: Grube Clara, Black Forest, Germany, Note: y-coordinates corrected by author

Physical Properties of Berryite

Cleavage:

[???] Indistinct

Color:

Blue gray, Gray.

Density:

6.7

Diaphaniety:

Opaque

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Optical Properties of Berryite

RL Anisotrophism:

Distinct to strong, from gray-white to red-brown.

RL Color:

Gray white.

RL Pleochroism:

Weak to distinct.

Calculated Properties of Berryite

Electron Density:

r_electron=5.86 gm/cc
note: r_Berryite=6.97 gm/cc.

Fermion Index

Fermion Index = 0.04666
Boson Index = 0.95334

Photoelectric:

PE_Berryite=1,327.26 barns/electron
U=PE_Berryite x r_electron=7,783.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Berryite is Not Radioactive

Berryite Classification

Dana Class:

3.6.15.1 (3)Sulfides - Sulfosalts

(3.6)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.6.15)Dana Group

3.6.15.1 Berryite Pb3(Ag,Cu)5Bi7S16 P 2₁/m 2/m

Strunz Class:

II/E.33-50 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts (Pb-Cu/Ag) with predominant Vismut x = 6.0 - 1.6

II/E.33 - Izoklakeite - Berryite series

II/E.33-05 Izoklakeite Pb27(Cu,Fe)2(Sb,Bi)19S57 Pnnm 2/m 2/m 2/m

II/E.33-10 Giessenite Pb13(Cu,Ag)(Bi,Sb)9S28(?) P 2₁/n 2/m

II/E.33-15 Tintinaite Pb22Cu4(Sb,Bi)30S69 Pnnm 2/m 2/m 2/m

II/E.33-20 Kobellite Pb22Cu4(Bi,Sb)30S69 Pnmm 2/m 2/m 2/m

II/E.33-30 Eclarite Pb9(Cu,Fe)Bi12S28 P nma 2/m 2/m 2/m

II/E.33-40 Nuffieldite Pb2Cu(Pb,Bi)Bi2S7 Pbnm 2/m 2/m 2/m

II/E.33-50 Berryite Pb3(Ag,Cu)5Bi7S16 P 2₁/m 2/m

Other Berryite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Berryite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Berryite Specimen Label here :

Berryite

Pb3(Ag,Cu)5Bi7S16
Dana No: 3.6.15.1 Strunz No: II/E.33-50
Locality:

Notes: