Berzelianite Mineral Data

Berzelianite Mineral Data +

General Berzelianite Information

Chemical Formula:

Cu2Se

Composition:

Molecular Weight = 206.05 gm

Copper 61.68 % Cu

Selenium 38.32 % Se

______

100.00 %

Empirical Formula:

Cu₂Se

Environment:

With other selenides in hydrotherma veinlets in dolomite.

IMA Status:

Valid Species (Pre-IMA) 1850

Locality:

Skrikerum, Kalmar, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named after Jons Jacob Berzelius (1779-1848), Swedish chemist who discovered the element selenium.

Synonym:

ICSD 238

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Berzelianite Image

Images:

Click Here for Larger Berzelianite Image

Berzelianite Athabascaite Umangite

Comments: Reflected light photomicrograph of umangite (pinkish), berzelianite (gray), athabascaite (small white areas in berzelianite), calcite (olive).
Location: Sierra de Umango, La Rioja, Argentin. Scale: Not Given.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Berzelianite Bellidoite Umangite

Comments: Dark bellidoite inclusions in black berzelianite with white umangite.
Location: Habri, near Tisnov, Jihomoravsky, Czech Republi. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Berzelianite

Comments: Blue-black metallic massive berzelianite.
Location: Bukov, Western Moravia, Severocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Berzelianite Novakite

Comments: Gray metallic dendritic novakite in white calcite with tarnished black berzelianite.
Location: Cerny Dul, Bohemia, Vychodocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Berzelianite Umangite

Comments: Black massive umangite intergrown with dark blue metallic berzelianite.
Location: Borsov, Bohemia, Vychodocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Berzelianite Crystallography

Cell Dimensions:

a = 5.739, Z = 4; V = 189.02 Den(Calc)= 7.24

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 2.02(1), 3.32(0.9), 1.726(0.8),

Crystal Structure:

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Borchert W , Zeitschrift fur Kristallographie , 106 (1945) p.5-24, Gitterumwandlungen im system Cu2-x Se

View Additional jPOWD Structure files for Berzelianite
[1] [2] [3] [4]

Physical Properties of Berzelianite

Cleavage:

None

Color:

Bluish gray, Gray, Black.

Density:

6.7

Diaphaniety:

Opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite).

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2 - Gypsum

Luster:

Metallic

Streak:

shining

Optical Properties of Berzelianite

RL Anisotrophism:

Isotropic, sometimes anisotropic.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Berzelianite in Air**
λ	R	∑ R(λ)
400 nm	25.80
420 nm	27.20
440 nm	28.60
460 nm	29.40
480 nm	29.40
500 nm	28.60
520 nm	27.80
540 nm	25.80
560 nm	24.30
580 nm	22.70
600 nm	21.20
620 nm	20.00
640 nm	19.00
660 nm	18.00
680 nm	17.00
700 nm	16.20

**Calculated Relative Intensity Colors of Berzelianite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	420%
R

Calculated Properties of Berzelianite

Electron Density:

r_electron=6.47 gm/cc
note: r_Berzelianite=7.24 gm/cc.

Fermion Index

Fermion Index = 0.02912
Boson Index = 0.97088

Photoelectric:

PE_Berzelianite= 59.11 barns/electron
U=PE_Berzelianite x r_electron= 382.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Berzelianite is Not Radioactive

Berzelianite Classification

Dana Class:

2.4.10.1 (2)Sulfides - Including Selenides and Tellurides

(2.4)where Am Bn Xp, with (m+n):p=2:1

(2.4.10)Dana Group

2.4.10.1 Berzelianite Cu2Se F m3m 4/m 3 2/m

Strunz Class:

II/B.03-10 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Selenides with predominant Copper

II/B.03 - Bertzeliannite - Athabascaite series

II/B.03-10 Berzelianite Cu2Se F m3m 4/m 3 2/m

II/B.03-20 Bellidoite Cu2Se P 4₁/m 4/m

II/B.03-30 Crookesite Cu7(Tl,Ag)Se4 I 4 4

II/B.03-40 Sabatierite Cu4TlSe3 P 4/mmm 4/m 2/m 2/m

II/B.03-50 Umangite Cu3Se2 P 2₁2₁2 2 2 2

II/B.03-60 Athabascaite Cu5Se4 Unk Ortho

Other Berzelianite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Berzelianite

Cu2Se
Dana No: 2.4.10.1 Strunz No: II/B.03-10
Locality:

Notes: