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Desautelsite

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Formula:
Mg6Mn3+2(OH)16[CO3] · 4H2O
Colour:
Bright orange
Hardness:
2
Specific Gravity:
2.13(2)
Crystal System:
Trigonal
Name:
Named by P.J. Dunn, D.R. Peacor, and T.D. Palmer in 1979 in honor of Paul Ernest Desautels (24 September 1920, Philadelphia, Pennsylvania, USA – 25 July 1991), chemist and Curator of Mineralogy, National Museum of Natural History (Smithsonian Institution), Washington, D.C., USA.
Hydrotalcite Group.
Mn3+-analogue of pyroaurite.


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Classification of DesautelsiteHide

Approved
Approval Year:
1978
First Published:
1979
5.DA.50

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
16b.6.2.4

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
6 : AmBn(XO3)pZqxH2O & with (m+n):p = 8:1
11.12.3

11 : Carbonates
12 : Carbonates of Mn

Physical Properties of DesautelsiteHide

Transparency:
Translucent
Colour:
Bright orange
Streak:
Pale orange
Hardness:
Cleavage:
Perfect
Perfect on {0001}
Density:
2.13(2) g/cm3 (Measured)    2.10 g/cm3 (Calculated)

Optical Data of DesautelsiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.569 nε = 1.547
Max Birefringence:
δ = 0.022
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Strong
Comments:
O = deep orange; E = pale orange.

Chemical Properties of DesautelsiteHide

Formula:
Mg6Mn3+2(OH)16[CO3] · 4H2O
IMA Formula:
Mg6Mn3+2CO3(OH)16 · 4H2O

Crystallography of DesautelsiteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Cell Parameters:
a = 3.114(1) Å, c = 23.39(2) Å
Ratio:
a:c = 1 : 7.511
Unit Cell V:
196.43 ų (Calculated from Unit Cell)
Morphology:
As hexagonal scales and plates, flattened on {0001}, with {0001} and {1010}.
Twinning:
By rotation about [0001], common.
Comment:
SG R-3m or R3m; Z = 3/8

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.76 (100)
3.88 (60)
2.622 (50)
2.332 (60)
1.981 (60)
1.768 (20)
1.527 (30)
Comments:
Powder pattern indistinguishable from that of pyroaurite (Fe2+-analogue).

Type Occurrence of DesautelsiteHide

Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts.
National Museum of Natural History, Washington, D.C., USA, 120219.

Synonyms of DesautelsiteHide

Other Language Names for DesautelsiteHide

Relationship of Desautelsite to other SpeciesHide

Other Members of this group:
DroninoiteNi6Fe2+3(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
HydrotalciteMg6Al2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
IowaiteMg6Fe3+2(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
MeixneriteMg6Al2(OH)16(OH)2 · 4H2OTrig. 3m (3 2/m) : R3m
PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2OTrig.
StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.
WoodalliteMg6Cr2(OH)16Cl2 · 4H2OTrig.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Artinite20 photos of Desautelsite associated with Artinite on mindat.org.
Serpentine Subgroup2 photos of Desautelsite associated with Serpentine Subgroup on mindat.org.
Brucite1 photo of Desautelsite associated with Brucite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.DA.AlexkhomyakoviteK6(Ca2Na)(CO3)5Cl·6H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2OMon.
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2OMon.
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2OMon.
5.DA.05UM1986-10-CO:ClHMgMnZnMg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.05UM1987-01-CO:HMgSMg4(CO3)2(OH)4 · 6H2O ?Mon.
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2OMon.
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2OTrig. 3m : R3c
5.DA.15OtwayiteNi2(CO3)(OH)2 · H2OOrth.
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O ?Iso.
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2OHex.
5.DA.25CallaghaniteCu2Mg2(CO3)(OH)6 · 2H2OMon.
5.DA.30Claraite(Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14·7H2OTric.
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2OTric.
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2OHex.
5.DA.40CaresiteFe2+4Al2(OH)12[CO3] · 3H2OTrig.
5.DA.40QuintiniteMg4Al2(OH)12[CO3] · 3H2OHex. 6 2 2 : P63 2 2
5.DA.40CharmariteMn2+4Al2(OH)12[CO3] · 3H2O
5.DA.45Stichtite-2HMg6(Cr,Al)2(CO3)(OH)16 · 4H2OHex.
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2OHex.
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2OHex.
5.DA.45Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2OHex.
5.DA.45Pyroaurite-2HMg6Fe3+2(OH)16(CO3) · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2OHex.
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2OTrig.
5.DA.50HydrotalciteMg6Al2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2OTrig.
5.DA.50StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.
5.DA.50UM1998-10-CO:CoHNiCo6Fe2(CO3)(OH)16 · 4H2O ?
5.DA.55CoalingiteMg10Fe3+2(OH)24[CO3] · 2H2OTrig.

Related Minerals - Dana Grouping (8th Ed.)Hide

16b.6.2.1HydrotalciteMg6Al2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
16b.6.2.2StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
16b.6.2.3PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.12.1RhodochrositeMnCO3Trig. 3m (3 2/m) : R3c
11.12.2HoldawayiteMn6(CO3)2(OH)7(Cl,OH)Mon. 2/m : B2/m
11.12.4KutnohoriteCa(Mn,Mg,Fe)(CO3)2Trig. 3 : R3

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for DesautelsiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Dunn, P.J., Peacor, D.R., Palmer, T.D. (1979) Desautelsite, a new mineral of the pyroaurite group. American Mineralogist: 64: 127-130.
Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012) Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine: 76(5): 1289-1336.

Internet Links for DesautelsiteHide

Localities for DesautelsiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Japan
 
  • Honshu Island
    • Kinki region
      • Mie Prefecture
        • Toba City
Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
  • Shikoku Island
    • Kochi Prefecture
      • Kochi City
Matsubara, S. et al (1984) Bulletin of the National Science Museum, 10, 81-86.
USA
 
  • California
    • Fresno Co.
      • Coalinga
Dunn, P.J., D.R. Peacor and T.D. Palmer (1979) Desautelsite, a new mineral of the pyroaurite group. American Mineralogist: 64: 127-130.
      • Diablo Range
        • Coalinga area
Dunn, P.J., D.R. Peacor and T.D. Palmer (1979) Desautelsite, a new mineral of the pyroaurite group. American Mineralogist: 64: 127-130; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 199.
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Picacho Peak
            • Clear Creek area
www.benitoitemine.com
            • Northeast of Picacho Peak
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 199, 201.
  • Maryland
    • Montgomery Co.
      • Rockville
Min Rec 36:4 pp 435-446
  • Pennsylvania
    • Lancaster Co.
      • State Line Chromite District
        • Fulton Township
Dunn, P.J., D.R. Peacor & T.D. Palmer (1979), Desautelsite, a new mineral of the pyroaurite group: American Mineralogist: 64: 127-130.
Mineral and/or Locality  
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