Chessexite Mineral Data

Chessexite Mineral Data

[Mineral Specimens] [Mineral Locations] [About Us] [Search] [Register]
Greenside Minerals
Newest website on the Internet for top quality, affordable minerals from around the World
We specialize in minerals from the UK and Ireland

General Chessexite Information

Chemical Formula:

(K,Na)4Ca2Mg3Al8(SiO4)2(SO4)10(OH)10·40(H2O)

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

Empirical Formula:

K₂Na₂Ca₂Mg₃Al₈(SiO₄)₂(SO₄)₁₀(OH)₁₀·40(H₂O)

Environment:

Coating fluorite.

IMA Status:

Approved IMA 1982

Locality:

Maine mine, Autun, Saone et Loire, France. Link to MinDat.org Location Data.

Name Origin:

Named for Ronald Chessex (1929-), Swiss petrologist and professor, University of Geneva.

Search for Chessexite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Chessexite Crystallography

Axial Ratios:

a:b:c =0.4899:1:0.3572

Cell Dimensions:

a = 13.7, b = 27.96, c = 9.99, Z = 2; V = 3,826.69 Den(Calc)= 2.19

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 13.91(1), 4.85(0.9), 3.982(0.6),

Physical Properties of Chessexite

Cleavage:

[???] Indistinct

Color:

White.

Density:

2.21

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Luster:

Silky

Streak:

white

Optical Properties of Chessexite

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

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

Electron Density:

r_electron=2.26 gm/cc
note: r_Chessexite=2.19 gm/cc.

Fermion Index

Fermion Index = 0.00522
Boson Index = 0.99478

Photoelectric:

PE_Chessexite= 1.95 barns/electron
U=PE_Chessexite x r_electron= 4.40 barns/cc.

Radioactivity:

GRapi = 45.95 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Chessexite - barely detectable

Chessexite Classification

Dana Class:

32.4.6.1 (32)Compound Sulfates

(32.4)(hydrous) with poly-anionic formula

(32.4.6)Dana Group

32.4.6.1 Chessexite (K,Na)4Ca2Mg3Al8(SiO4)2(SO4)10(OH)10·40(H2O) Unk Ortho

Strunz Class:

VIII/B.26-10 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.26 - Chessexite series

VIII/B.26-10 Chessexite (K,Na)4Ca2Mg3Al8(SiO4)2(SO4)10(OH)10·40(H2O) Unk Ortho

Other Chessexite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

Search for Chessexite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Chessexite :

AA Mineral Specimens

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

MineralsWeb Fine Minerals

T G Fine Minerals

Wrights Rock Shop

Translate Chessexite Mineral Data :

Ask about Chessexite 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 Chessexite Specimen Label here :

Chessexite

(K,Na)4Ca2Mg3Al8(SiO4)2(SO4)10(OH)10·40(H2O)
Dana No: 32.4.6.1 Strunz No: VIII/B.26-10
Locality:

Notes: