Burnsite Mineral Data

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General Burnsite Information

Chemical Formula:

KCdCu7O2(SeO3)2Cl9

Composition:

Molecular Weight = 1,200.93 gm

Potassium 3.52 % K 4.24 % K₂O

Cadmium 9.08 % Cd 10.37 % CdO

Copper 36.93 % Cu 41.58 % Cu₂O

Selenium 14.00 % Se 19.68 % SeO₂

Chlorine 25.18 % Cl 25.18 % Cl

- % Cl -5.68 % -O=Cl₂

Oxygen 11.28 % O

______ ______

100.00 % 95.37 % = TOTAL OXIDE

Empirical Formula:

K_1.08Cd_0.97Cu_6.98O_2.08(SeO₃)_2.13Cl_8.53

Environment:

Fumarole deposits. Similarity to ilinskite; structure

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

North Breach of the great fissure eruption, Tolbachik volcano, Kamchatka, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Peter C. Burns (1966-), Canadian-born mineralogist and crystallographer.

Synonym:

IMA2000-050

Burnsite Image

Images:

Burnsite Cotunnite

Comments: Images of burnsite grains (dark) in intimate intergrowth with cotunnite (light). Images obtained by scanning electron microscopy.
Location: North Breach of the great fissure Tolbachik volcano eruption (1975-1976), Kamchatka Peninsula, Russia. Scale: Scale bar: 20 µ-m.
© Canadian Mineralogist

Burnsite Crystallography

Axial Ratios:

a:c = 1:1.76766

Cell Dimensions:

a = 8.7805, c = 15.521, Z = 2; V = 1,036.31 Den(Calc)= 3.85

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 7.779(1)(002), 3.814(0.8)(200), 4.391(0.8)(110),3.066(0.7)(203), 2.501(0.6)(213), 2.19(0.5)(220), 2.582(0.5)(006), 6.823(0.5)(101), 1.919(0.4)(216),

Crystal Structure:

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Burns P C , Krivovichev S V , Filatov S K , The Canadian Mineralogist , 40 (2002) p.1587-1595, New Cu coordination polyhedra in the crystal structure of burnsite,, KCdCu7O2(SeO3)2Cl9

Physical Properties of Burnsite

Cleavage:

{001} Good

Color:

Dark red.

Diaphaneity:

Opaque to translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

1-1.5 - Talc or a little harder

Luster:

Vitreous - Metallic

Streak:

red

Optical Properties of Burnsite

Gladstone-Dale:

CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2379,KC= 0.237
Ncalc = 1.91

Optical Data:

Uniaxial (-), e=1.912, w=1.92, bire=0.0080.

RL Bireflectance:

Weak.

Calculated Properties of Burnsite

Electron Density:

Bulk Density (Electron Density)=3.56 gm/cc
note: Specific Gravity of Burnsite =3.85 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Burnsite= 53.29 barns/electron
U=PE_Burnsite x r_electron= 189.51 barns/cc.

Radioactivity:

GRapi = 46.85 (Gamma Ray American Petroleum Institute Units)
Concentration of Burnsite per GRapi unit = 2.13 (%)

Estimated Radioactivity from Burnsite - barely detectable

Burnsite Classification

Dana Class:

33.03.06.01 (33)Selenates and Tellurates

(33.03)with other anion groups

(33.03.06)Dana Group

33.03.06.01 Burnsite! KCdCu7O2(SeO3)2Cl9 P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

04.JG.35 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JG -Selenites with additional anions, without H2O

04.JG.35 Burnsite! KCdCu7O2(SeO3)2Cl9 P 6₃/mmc 6/m 2/m 2/m

Other Burnsite Information

References:

NAME( AmMin, 88:1175) PHYS. PROP.(AmMin, 88:1175) OPTIC PROP.(AmMin, 88:1175)

See Also:

Links to other databases for Burnsite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Ask about Burnsite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Burnsite

KCdCu7O2(SeO3)2Cl9
Dana No: 33.03.06.01 Strunz No: 04.JG.35
Locality:

Notes: