Desautelsite Mineral Data

Desautelsite Mineral Data +

[Newest Minerals] [Minerals for Sale] [Tsumeb Mine] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa and Mastercard are Welcome

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).

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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Desautelsite

Electron Density:

r_electron=2.17 gm/cc
note: r_Desautelsite=2.13 gm/cc.

Fermion Index

Fermion Index = 0.02257
Boson Index = 0.97743

Photoelectric:

PE_Desautelsite= 4.67 barns/electron
U=PE_Desautelsite x r_electron= 10.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Desautelsite is Not Radioactive

Desautelsite Classification

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

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

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 -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

Search for Desautelsite using:

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

Visit our Advertisers for Desautelsite :

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

Rockshop.cz

T G Fine Minerals

Wrights Rock Shop

Translate Desautelsite Mineral Data :

Ask about Desautelsite 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 Desautelsite Specimen Label here :

Desautelsite

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

Notes: