Luzonite Mineral Data

Luzonite Mineral Data +

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General Luzonite Information

Chemical Formula:

Cu3AsS4

Composition:

Molecular Weight = 393.82 gm

Copper 48.41 % Cu

Arsenic 19.02 % As

Sulfur 32.57 % S

______

100.00 %

Empirical Formula:

Cu₃AsS₄

Environment:

Low to moderate temperature hydrothermal deposits. Dimorphous with enargite.

IMA Status:

Valid Species (Pre-IMA) 1874

Locality:

Mancayan, Luzon Island, Phillippines. Link to MinDat.org Location Data.

Name Origin:

Named after the locality

Luzonite Image

Images:

Luzonite

Comments: Pinkish-brown metallic luzonite, tarnishing gray, crystalline.
Location: Chin Kuashih, Kagoshima, Taiwan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Luzonite Crystallography

Axial Ratios:

a:c = 1:1.97826

Cell Dimensions:

a = 5.29, c = 10.465, Z = 2; V = 292.85 Den(Calc)= 4.47

Crystal System:

Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: I 42m

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

By Intensity(I/I_o): 3.046(1), 1.855(0.9), 1.592(0.7),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
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Marumo F , Nowacki W , Zeitschrift fur Kristallographie , 124 (1967) p.1-8, A refinement of the crystal structure of luzonite, Cu3AsS4, Locality: Cerro de Pasco, Peru

Physical Properties of Luzonite

Cleavage:

None

Color:

Gray, Dark pink brown, Red.

Density:

4.4 - 4.6, Average = 4.5

Diaphaniety:

Opaque

Fracture:

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

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Streak:

black

Optical Properties of Luzonite

RL Anisotrophism:

Strong, in greenish yellow and purplish.

RL Color:

Pale brownish pink.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Luzonite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	26.50	29.20
420 nm	25.50	27.70
440 nm	24.50	26.20
460 nm	23.80	25.00
480 nm	23.60	24.60
500 nm	23.60	25.00
520 nm	23.90	26.00
540 nm	24.40	27.00
560 nm	25.00	27.90
580 nm	25.60	28.70
600 nm	26.20	29.30
620 nm	27.00	29.90
640 nm	27.70	30.30
660 nm	28.40	30.50
680 nm	28.90	30.50
700 nm	29.00	30.30

**Calculated Relative Intensity Colors of Luzonite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%
R₁
R₂

Calculated Properties of Luzonite

Electron Density:

r_electron=4.18 gm/cc
note: r_Luzonite=4.47 gm/cc.

Fermion Index

Fermion Index = 0.00244
Boson Index = 0.99756

Photoelectric:

PE_Luzonite= 36.75 barns/electron
U=PE_Luzonite x r_electron= 153.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Luzonite is Not Radioactive

Luzonite Classification

Dana Class:

3.2.2.1 (3)Sulfides - Sulfosalts

(3.2)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.2.2)Dana Group

3.2.2.1 Luzonite Cu3AsS4 I 42m 4 2m

3.2.2.2 Famatinite Cu3SbS4 I 42m 4 2m

3.2.2.3 Permingeatite Cu3SbSe4 I 42m 4 2m

Strunz Class:

II/C.06-10 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.06 - Stannite group

II/C.06-10 Luzonite Cu3AsS4 I 42m 4 2m

II/C.06-20 Famatinite Cu3SbS4 I 42m 4 2m

II/C.06-30 Permingeatite Cu3SbSe4 I 42m 4 2m

II/C.06-40 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m

II/C.06-45 Barquillite! Cu2CdGeS4 I 42m 4 2m

II/C.06-50 Kuramite Cu3SnS4 I 42m 4 2m

II/C.06-60 Stannite Cu2FeSnS4 I 42m 4 2m

II/C.06-70 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m

II/C.06-80 Kesterite Cu2(Zn,Fe)SnS4 I 4 4

II/C.06-90 Cernyite Cu2CdSnS4 I 42m 4 2m

II/C.06-100 Velikite Cu2HgSnS4 I 42m 4 2m

II/C.06-110 Hocartite Ag2FeSnS4 I 42m 4 2m

II/C.06-120 Pirquitasite Ag2ZnSnS4 I 42m 4 2m

II/C.06-130 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 4₃2, P 43m, or P m3m Cubic

II/C.06-140 Petrukite (Cu,Fe,Zn)2(Sn,In)S4 P mn2₁ mm2

II/C.06-150 Rhodostannite Cu2FeSn3S8 I 4₁/a 4/m

II/C.06-160 Toyohaite Ag2FeSn3S8 I 4₁/a 4/m

Other Luzonite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Luzonite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Luzonite

Cu3AsS4
Dana No: 3.2.2.1 Strunz No: II/C.06-10
Locality:

Notes: