Mineralogy Database

Burkeite Mineral Data

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General Burkeite Information

Help on Chemical  Formula: Chemical Formula: Na6(CO3)(SO4)2
Help on Composition: Composition: Molecular Weight = 390.08 gm
   Sodium  35.36 %  Na   47.67 % Na2O
   Carbon   3.08 %  C    11.28 % CO2
   Sulfur  16.44 %  S    41.05 % SO3
   Oxygen  45.12 %  O
          ______        ______ 
          100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na6(CO3)(SO4)2
Help on Environment: Environment: Continental evaporite deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1921
Help on Locality: Locality: Searles Lake, San Bernardino Co. California. Found in the lake clays as porphyroblastic crystals. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for William Edmund Burke (1880-1966), chemical engineer, American Potash and Chemical Co., who discovered the artificial salt.
Help on Name Pronunciation: Name Pronunciation: Burkeite Say BURKEITE
Help on Synonym: Synonym: ICSD 71020
  PDF 24-1134
 

Burkeite Image

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  Burkeite

Comments: Translucent to opaque vuggy mass of burkeite.
Location: Searles Lake, San Bernardino County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Burkeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7654:1:0.1867
Help on Cell Dimensions: Cell Dimensions: a = 21.15, b = 27.63, c = 5.16, Z = 12; V = 3,015.37 Den(Calc)= 2.58
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.78(1), 2.58(0.8), 3.78(0.8),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Burkeite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Gray, Gray white, White, Light brown, Pink.
Help on Density: Density: 2.57
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Fluorescent and phosphorescent, Short UV=yellow-white, Long UV=yellow-white.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white
 

Optical Properties of Burkeite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1848,KPDmeas= 0.1855,KC= 0.187
Ncalc = 1.48
Help on Optical Data: Optical Data: Biaxial (-), a=1.448, b=1.489, g=1.493, bire=0.0450, 2V(Calc)=32, 2V(Meas)=34. Dispersion r > v distinct.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
 

Calculated Properties of Burkeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.53 gm/cc
note: Specific Gravity of Burkeite =2.57 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0017883428
Boson Index = 0.9982116572
Help on Photoelectric: Photoelectric: PEBurkeite = 1.59 barns/electron
U=PEBurkeite x rElectron Density= 4.03 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Burkeite is Not Radioactive
 

Burkeite Classification

Help on  Dana Class: Dana Class: 32.01.01.01 (32)Compound Sulfates
  (32.01)(anhydrous) with simple bi-anionic formula
  (32.01.01)Dana Group
 
32.01.01.01 Burkeite Na6(CO3)(SO4)2 P mmm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 07.BD.25 07 - SULFATES (SELENATES, TELLURATES)
  07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O
  07.BD -With only large cations
 
07.BD.25 Burkeite Na6(CO3)(SO4)2 P mmm 2/m 2/m 2/m
 

Other Burkeite Information

Help on See Also: See Also: Links to other databases for Burkeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Burkeite

Na6(CO3)(SO4)2
Dana No: 32.01.01.01 Strunz No: 07.BD.25
Locality:

 

Notes:

 

 


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