Desautelsite Mineral Data

General Desautelsite Information

Chemical Formula:

Mg6Mn+++2(CO3)(OH)16•4(H2O)

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

Empirical Formula:

Mg₆Mn²⁺₂(CO₃)(OH)₁₆•4(H₂O)

Environment:

Imbedded in brucite and in serpentinites.

IMA Status:

Approved IMA 1979

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.

Name Origin:

Named after Paul E. Desautels (1920-1991), curator of minerals at the U. S. National Museum of Natural History (Smithstonian Institution).

Name Pronunciation:

Desautelsite + Pronunciation

Desautelsite Image

Images:

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

Axial Ratios:

a:c = 1:7.50882

Cell Dimensions:

a = 6.23, c = 46.78, Z = 3; V = 1,572.41 Den(Calc)= 2.09

Crystal System:

TrigonalSpace Group: R 3m or R 3m

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

By Intensity(I/I_o): 7.76(1), 2.332(0.6), 3.88(0.6),

Physical Properties of Desautelsite

Cleavage:

{0001} Perfect

Color:

Bright orange.

Density:

2.13

Diaphaneity:

Transparent

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Pearly

Streak:

light orange

Optical Properties of Desautelsite

Dichroism (e):

light orange.

Dichroism (w):

deep orange.

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

Optical Data:

Uniaxial (-), e=1.547, w=1.569, bire=0.0220.

Calculated Properties of Desautelsite

Electron Density:

Bulk Density (Electron Density)=2.17 gm/cc
note: Specific Gravity of Desautelsite =2.13 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Desautelsite= 4.67 barns/electron
U=PE_Desautelsite x rElectron Density= 10.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Desautelsite is Not Radioactive

Desautelsite Classification

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

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

References:

NAME( MinRec) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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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Ask about Desautelsite here :
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Print or Cut-and-Paste your Desautelsite Specimen Label here :

Desautelsite

Mg6Mn+++2(CO3)(OH)16•4(H2O)
Dana No: 16b.06.02.04 Strunz No: 05.DA.50
Locality:

Notes: