Bartonite Mineral Data

Bartonite Mineral Data +

General Bartonite Information

Chemical Formula:

K3Fe10S14

Composition:

Molecular Weight = 1,124.69 gm

Potassium 10.43 % K

Iron 49.66 % Fe

Sulfur 39.92 % S

______

100.00 %

Empirical Formula:

K₃Fe²⁺₁₀S₁₄

Environment:

In clots with other sulfides and silicates in an alkalic diatreme which intruded Franciscan rocks.

IMA Status:

Approved IMA 1981

Locality:

Coyote Peak diatreme, 16 miles SW of Orick, Humboldt Co. California. Link to MinDat.org Location Data.

Name Origin:

For Paul B. Barton, Jr., sulfide petrologist with the U.S. Geological Society.

Synonym:

ICSD 100746

PDF 35-476

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Bartonite Crystallography

Axial Ratios:

a:c = 1:1.9787

Cell Dimensions:

a = 10.424, c = 20.626, Z = 4; V = 2,241.22 Den(Calc)= 3.33

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm

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

By Intensity(I/I_o): 2.998(1), 5.99(0.77), 1.833(0.4),

Crystal Structure:

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Evans H T , Clark J R , American Mineralogist , 66 (1981) p.376-384, The crystal structure of bartonite, a potassium iron sulfide, and its, relationship to pentlandite and djerfisherite

Physical Properties of Bartonite

Cleavage:

[112] Distinct

Color:

Black brown.

Density:

3.305

Diaphaniety:

Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Streak:

black

Optical Properties of Bartonite

RL Color:

Yellowish green-gray to yellowish green-brown.

RL Pleochroism:

Very weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Bartonite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	21.70	18.30
420 nm	16.70	14.40
440 nm	17.70	17.20
460 nm	18.40	18.60
480 nm	19.40	19.50
500 nm	19.70	20.60
520 nm	20.30	21.40
540 nm	20.90	21.80
560 nm	21.90	22.70
580 nm	22.70	23.20
600 nm	23.40	23.70
620 nm	23.90	24.30
640 nm	24.70	25.10
660 nm	25.00	25.50
680 nm	25.20	26.10
700 nm	26.40	26.50

**Calculated Relative Intensity Colors of Bartonite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	450%	490%
R₁
R₂

Calculated Properties of Bartonite

Electron Density:

r_electron=3.20 gm/cc
note: r_Bartonite=3.33 gm/cc.

Fermion Index

Fermion Index = 0.01353
Boson Index = 0.98647

Photoelectric:

PE_Bartonite= 18.21 barns/electron
U=PE_Bartonite x r_electron= 58.34 barns/cc.

Radioactivity:

GRapi = 144.76 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Bartonite - barely detectable

Bartonite Classification

Dana Class:

2.9.19.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.9.19)Dana Group

2.9.19.1 Bartonite K3Fe10S14 I 4/mmm 4/m 2/m 2/m

2.9.19.2 Chlorbartonite! K6Fe24S26(Cl,S) I 4/mmm 4/m 2/m 2/m

Strunz Class:

II/F.07-20 II - Sulfides and sulphosalts

II/F - Sulfides with nonmetallic properties, Alkalisulfides

II/F.07 - Rasvumite - Bartonite series

II/F.07-10 Rasvumite KFe2S3 C mcm 2/m 2/m 2/m

II/F.07-20 Bartonite K3Fe10S14 I 4/mmm 4/m 2/m 2/m

II/F.07-30 Chlorbartonite! K6Fe24S26(Cl,S) I 4/mmm 4/m 2/m 2/m

Other Bartonite Information

References:

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

See Also:

Links to other databases for Bartonite :
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 Bartonite Specimen Label here :

Bartonite

K3Fe10S14
Dana No: 2.9.19.1 Strunz No: II/F.07-20
Locality:

Notes: