Mineralogy Database

Chessexite Mineral Data

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General Chessexite Information

Help on Chemical  Formula: Chemical Formula: (K,Na)4Ca2Mg3Al8(SiO4)2(SO4)10(OH)10•40(H2O)
Help on Composition: Composition: Molecular Weight = 2,528.59 gm
   Potassium   3.09 %  K     3.73 % K2O
   Sodium      1.82 %  Na    2.45 % Na2O
   Calcium     3.17 %  Ca    4.44 % CaO
   Magnesium   2.88 %  Mg    4.78 % MgO
   Aluminum    8.54 %  Al   16.13 % Al2O3
   Silicon     2.22 %  Si    4.75 % SiO2
   Hydrogen    3.59 %  H    32.06 % H2O
   Sulfur     12.68 %  S    31.66 % SO3
   Oxygen     62.01 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2Na2Ca2Mg3Al8(SiO4)2(SO4)10(OH)10�40(H2O)
Help on Environment: Environment: Coating fluorite.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Maine mine, Autun, Saone et Loire, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ronald Chessex (1929-), Swiss petrologist and professor, University of Geneva.

Chessexite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4899:1:0.3572
Help on Cell Dimensions: Cell Dimensions: a = 13.7, b = 27.96, c = 9.99, Z = 2; V = 3,826.69 Den(Calc)= 2.19
Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 13.91(1), 4.85(0.9), 3.982(0.6),

Physical Properties of Chessexite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: White.
Help on Density: Density: 2.21
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Luster: Luster: Silky
Help on Streak: Streak: white

Optical Properties of Chessexite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.12 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.112 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2125,KPDmeas= 0.2106,KC= 0.2392
Ncalc = 1.52 - 1.53
Help on Optical Data: Optical Data: Biaxial (+), a=1.456, b=1.46, g=1.48, bire=0.0240, 2V(Calc)=50, 2V(Meas)=47.

Calculated Properties of Chessexite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.26 gm/cc
note: Specific Gravity of Chessexite =2.19 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0052216723
Boson Index = 0.9947783277
Help on Photoelectric: Photoelectric: PEChessexite = 1.95 barns/electron
U=PEChessexite x relectron= 4.40 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 45.95 (Gamma Ray American Petroleum Institute Units)
Concentration of Chessexite per GRapi unit = 2.18 (%)

Estimated Radioactivity from Chessexite - barely detectable


Chessexite Classification

Help on  Dana Class: Dana Class: (32)Compound Sulfates
  (32.04)(hydrous) with poly-anionic formula
  (32.04.06)Dana Group Chessexite (K,Na)4Ca2Mg3Al8(SiO4)2(SO4)10(OH)10•40(H2O) Unk Ortho
Help on  Strunz Class: Strunz Class: 07.DG.35 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
07.DG.35 Chessexite (K,Na)4Ca2Mg3Al8(SiO4)2(SO4)10(OH)10•40(H2O) Unk Ortho

Other Chessexite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Chessexite :
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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Dana No: Strunz No: 07.DG.35





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