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Desautelsite Mineral Data

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General Desautelsite Information

Help on Chemical  Formula: Chemical Formula: Mg6Mn+++2(CO3)(OH)16•4(H2O)
Help on Composition: Composition: Molecular Weight = 659.89 gm
   Magnesium  22.10 %  Mg   36.65 % MgO
   Manganese  16.65 %  Mn   21.50 % MnO
   Hydrogen    3.67 %  H    32.76 % H2O
   Carbon      1.82 %  C     6.67 % CO2
   Oxygen     55.76 %  O
             ______        ______ 
             100.00 %       97.58 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg6Mn2+2(CO3)(OH)16•4(H2O)
Help on Environment: Environment: Imbedded in brucite and in serpentinites.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Cedar Hill Quarry, Lancaster County, Pennsylvania, USA. Artinite locality and old talc prospect, 1 mile NE of Paicacho Peak, San Benito Co. California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Paul E. Desautels (1920-1991), curator of minerals at the U. S. National Museum of Natural History (Smithstonian Institution).
Help on Name Pronunciation: Name Pronunciation: Desautelsite + Pronunciation Say DESAUTELSITE

Desautelsite Image

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Comments: Serpentinite with scaly reddish-orange crystals of desautelsite.
Location: Artinite Pit, San Benito County, California, USA. Scale: 3 x 4 cm.
© John Veevaert

Desautelsite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:7.50882
Help on Cell Dimensions: Cell Dimensions: a = 6.23, c = 46.78, Z = 3; V = 1,572.41 Den(Calc)= 2.09
Help on Crystal System: Crystal System: Trigonal Space Group: R 3m or R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.76(1), 2.332(0.6), 3.88(0.6),

Physical Properties of Desautelsite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Bright orange.
Help on Density: Density: 2.13
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Pearly
Help on Streak: Streak: light orange

Optical Properties of Desautelsite

Help on Dichroism (e): Dichroism (e): light orange.
Help on Dichroism (w): Dichroism (w): deep orange.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.087 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.107 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.267,KPDmeas= 0.262,KC= 0.2411
Ncalc = 1.5 - 1.51
Help on Optical Data: Optical Data: Uniaxial (-), e=1.547, w=1.569, bire=0.0220.

Calculated Properties of Desautelsite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.17 gm/cc
note: Specific Gravity of Desautelsite =2.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEDesautelsite = 4.67 barns/electron
U=PEDesautelsite x rElectron Density= 10.13 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Desautelsite is Not Radioactive

Desautelsite Classification

Help on  Dana Class: Dana Class: 16b.06.02.04 (16b)Carbonates - Hydroxyl or Halogen
  (16b.06)Dana Type
  (16b.06.02)Sjorgrenite-Hydrotalcite Group (Hydrotalcite Subgroup:Rhombohedral)
16b.06.02.01 Hydrotalcite Mg6Al2(CO3)(OH)16•4(H2O) R 3m 3 2/m
16b.06.02.02 Stichtite Mg6Cr2(CO3)(OH)16•4(H2O) R 3m 3 2/m
16b.06.02.03 Pyroaurite Mg6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
16b.06.02.04 Desautelsite Mg6Mn2(CO3)(OH)16•4(H2O) R 3m or R 3m Trig
16b.06.02.05 Droninoite! Ni3FeCl(OH)8•2H2O R 3m, R 3m or R 32 Trig
Help on  Strunz Class: Strunz Class: 05.DA.50 05 - CARBONATES (NITRATES)
  05.D - Carbonates with Additional Anions, with H2O
  05.DA -With medium-sized cations
05.DA.50 Desautelsite Mg6Mn2(CO3)(OH)16•4(H2O) R 3m or R 3m Trig
05.DA.50 Comblainite Ni6Co2(CO3)(OH)16•4(H2O) R 3m 3 2/m
05.DA.50 Hydrotalcite Mg6Al2(CO3)(OH)16•4(H2O) R 3m 3 2/m
05.DA.50 Pyroaurite Mg6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
05.DA.50 Reevesite Ni6Fe2(CO3)(OH)16•4(H2O) R 3m 3 2/m
05.DA.50 Stichtite Mg6Cr2(CO3)(OH)16•4(H2O) R 3m 3 2/m
05.DA.50 Takovite Ni6Al2(OH)16(CO3,OH)•4(H2O) R 3m 3 2/m

Other Desautelsite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Desautelsite :
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: 16b.06.02.04 Strunz No: 05.DA.50





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