Desautelsite Mineral Data + Say DESAUTELSITE


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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).
 

Desautelsite Image

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Desautelsite

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: TrigonalSpace 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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.17 gm/cc
note: rDesautelsite =2.13 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.02257
Boson Index = 0.97743
Help on Photoelectric: Photoelectric:

PEDesautelsite = 4.67 barns/electron
U=PEDesautelsite x relectron= 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.6.2.4 (16b)Carbonates - Hydroxyl or Halogen
  (16b.6)Dana Type
  (16b.6.2)Sjorgrenite-Hydrotalcite Group (Hydrotalcite Subgroup:Rhombohedral)
 
16b.6.2.1 Hydrotalcite Mg6Al2(CO3)(OH)16·4(H2O) R 3m 3 2/m
 
16b.6.2.2 Stichtite Mg6Cr2(CO3)(OH)16·4(H2O) R 3m 3 2/m
 
16b.6.2.3 Pyroaurite Mg6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m
 
16b.6.2.4 Desautelsite Mg6Mn2(CO3)(OH)16·4(H2O) R 3m or R 3m Trig
Help on  Strunz Class: Strunz Class: V/E.03-40 V - Nitrates, Carbonates and Borates
  V/E - Water-bearing carbonates with unfamiliar anions
  V/E.03 - Hydrotalcite group
 
V/E.03-10 Hydrotalcite Mg6Al2(CO3)(OH)16·4(H2O) R 3m 3 2/m
 
V/E.03-20 Stichtite Mg6Cr2(CO3)(OH)16·4(H2O) R 3m 3 2/m
 
V/E.03-30 Pyroaurite Mg6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m
 
V/E.03-40 Desautelsite Mg6Mn2(CO3)(OH)16·4(H2O) R 3m or R 3m Trig
 
V/E.03-50 Takovite Ni6Al2(OH)16(CO3,OH)·4(H2O) R 3m 3 2/m
 
V/E.03-60 Reevesite Ni6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m
 
V/E.03-70 Comblainite Ni6Co2(CO3)(OH)16·4(H2O) R 3m 3 2/m
 
V/E.03-80 Sergeevite Ca2Mg11(CO3)9(HCO3)4(OH)4·6(H2O) R 32 3 2
 

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Desautelsite

Mg6Mn+++2(CO3)(OH)16·4(H2O)
Dana No: 16b.6.2.4 Strunz No: V/E.03-40
Locality:

 

Notes:

 

 
   
 
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