Dimorphous with metastibnite, compare bismuthinite, guanajuatite, animonselite.
IMA Status:
Valid Species (Pre-IMA) 1832
Locality:
Ichinokawa, Shikoku, Japan. Link to MinDat.org Location Data.
Name Origin:
From the Greek, stimmi or stibi, "antimony," thence to the Latin, stibium. Also from the Greek anthemon, "flower" in allusion to the form of crystal druses.
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Physical Properties of Stibnite
Cleavage:
{010} Perfect
Color:
Lead gray, Bluish lead gray, Steel gray, Black.
Density:
4.63
Diaphaneity:
Opaque
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Striated - Parallel lines on crystal surface or cleavage face.
Hardness:
2 - Gypsum
Luminescence:
Non-fluorescent.
Luster:
Metallic
Magnetism:
Nonmagnetic
Streak:
blackish gray
Optical Properties of Stibnite
RL Anisotrophism:
Strong.
RL Color:
White.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Stibnite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
34.20
55.20
420 nm
33.60
54.50
440 nm
33.00
53.80
460 nm
32.80
52.80
480 nm
32.80
51.80
500 nm
32.80
50.70
520 nm
32.80
49.50
540 nm
32.60
48.50
560 nm
31.80
46.80
580 nm
31.20
45.50
600 nm
30.70
44.40
620 nm
30.60
43.50
640 nm
30.80
42.60
660 nm
31.20
41.80
680 nm
31.00
41.20
700 nm
30.60
40.50
Calculated Relative Intensity Colors of Stibnite in Air
Relative Intensity
0%
30%
60%
90%
100%
120%
150%
180%
210%
240%
270%
280%
R1
R2
Calculated Properties of Stibnite
Electron Density:
Bulk Density (Electron Density)=4.03 gm/cc note: Specific Gravity of Stibnite =4.56 gm/cc.
Fermion Index:
Fermion Index = 0.0021239012 Boson Index = 0.9978760988
Photoelectric:
PEStibnite = 240.35 barns/electron U=PEStibnite x rElectron Density= 967.90 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Stibnite is Not Radioactive
Stibnite Classification
Dana Class:
02.11.02.01(02)Sulfides - Including Selenides and Tellurides
Chemical Formula: 
