Senarmontite Mineral Data

Senarmontite Mineral Data +

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General Senarmontite Information

Chemical Formula:

Sb2O3

Composition:

Molecular Weight = 275.50 gm

Antimony 88.39 % Sb 105.81 % Sb₂O₃

Oxygen 11.61 % O

______ ______

100.00 % 105.81 % = TOTAL OXIDE

Empirical Formula:

Sb₂O₂

Environment:

Oxidation of stibnite and other antimony minerals.

IMA Status:

Valid Species (Pre-IMA) 1851

Locality:

Djebel-Haminate mine, northwest of Ain-Beida, District of Haracta, Constantine, Algeria. Link to MinDat.org Location Data.

Name Origin:

Named after the French mineralogist, H. Hureau de Senarmot (1808-1862).

Synonym:

ICSD 1944

PDF 43-1071

Senarmontite Image

Images:

Senarmontite

Comments: Perfect octahedral, transparent, light to dark gray senarmontite crystals to 3mm.
Location: Djebel Haminate mine, Ain Beida, Constantine, Algeria. Scale: Pictrure size 1.5 cm.
© Tom Loomis / Dakota Matrix

Senarmontite Crystallography

Cell Dimensions:

a = 11.14, Z = 16; V = 1,382.47 Den(Calc)= 5.29

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

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

By Intensity(I/I_o): 3.218(1), 1.972(0.42), 2.788(0.4),

Crystal Structure:

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Svensson C , Acta Crystallographica, Section B , 31 (1975) p.2016-2018, Refinement of the crystal structure of cubic antiomony trioxide, Sb2O3, Locality: synthetic

View Additional jPOWD Structure files for Senarmontite
[1] [2]

Physical Properties of Senarmontite

Cleavage:

[111] Imperfect, [111] Imperfect, [111] Imperfect

Color:

White, Colorless, Gray.

Density:

5.2 - 5.3, Average = 5.25

Diaphaniety:

Transparent to translucent

Fracture:

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

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

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

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

2 - Gypsum

Luminescence:

None.

Luster:

Adamantine

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Senarmontite

Gladstone-Dale:

CI meas= 0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2055,KPDmeas= 0.207,KC= 0.2148

Optical Data:

Isotropic, n=2.087.

Calculated Properties of Senarmontite

Electron Density:

r_electron=4.50 gm/cc
note: r_Senarmontite=5.25 gm/cc.

Fermion Index

Fermion Index = 0.00005
Boson Index = 0.99995

Photoelectric:

PE_Senarmontite= 303.39 barns/electron
U=PE_Senarmontite x r_electron=1,364.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Senarmontite is Not Radioactive

Senarmontite Classification

Dana Class:

4.3.9.2 (4)Simple Oxides

(4.3)with a cation charge of 3+ (A+++2 O3)

(4.3.9)Dana Group

4.3.9.1 Arsenolite As2O3 F d3m 4/m 3 2/m

4.3.9.2 Senarmontite Sb2O3 F d3m 4/m 3 2/m

Strunz Class:

IV/C.02-20 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.02 - Arsenolite - Sillenite series

IV/C.02-10 Arsenolite As2O3 F d3m 4/m 3 2/m

IV/C.02-20 Senarmontite Sb2O3 F d3m 4/m 3 2/m

IV/C.02-30 Bismite Bi2O3 P 2₁/c 2/m

IV/C.02-35 Sphaerobismoite Bi2O3 P 4₂212 or P 4₁/n Tetra

IV/C.02-40 Sillenite Bi12SiO20 I 23 2 3

IV/C.02-50 Chrombismite! Bi16CrO27 I 4,I 4-,I 4/m Tetra

Other Senarmontite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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

Senarmontite

Sb2O3
Dana No: 4.3.9.2 Strunz No: IV/C.02-20
Locality:

Notes: