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Guidottiite

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About GuidottiiteHide

Charles V. Guidotti
Formula:
Mn2Fe3+(Fe3+SiO5)(OH)4
Colour:
Black
Lustre:
Vitreous, Silky
Hardness:
4 - 4½
Specific Gravity:
3.33
Crystal System:
Hexagonal
Name:
Named in honour of Charles V. Guidotti (19 September 1935, Somerville, Massachusetts, USA - 19 May 2005, Boston, Massachusetts, USA), professor at the University of California, Davis (1962–1969), the University of Wisconsin–Madison (1969–1981), and the University of Maine (1981–2005), for his many contributions to phyllosilicate mineralogy. He also made important contributions to the petrologic studies of metamorphic rocks in the northern Appalachian Mountains of Maine.

Classification of GuidottiiteHide

Approved
Approval Year:
2009
First Published:
2010
9.ED.15

9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
71.1.4.8

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers

Physical Properties of GuidottiiteHide

Vitreous, Silky
Transparency:
Opaque
Comment:
Vitreous in bulk, silky under magnification
Colour:
Black
Hardness:
4 - 4½ on Mohs scale
Cleavage:
Perfect
(001)
Density:
3.33 g/cm3 (Measured)    3.264(27) g/cm3 (Calculated)
Comment:
Measured on bulk sample with impurities. Calculated value is based on sets of microprobe analyses.

Chemical Properties of GuidottiiteHide

Formula:
Mn2Fe3+(Fe3+SiO5)(OH)4
IMA Formula:
Mn2Fe3+(SiFe3+)O5(OH)4

Crystallography of GuidottiiteHide

Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Cell Parameters:
a = 5.5472(3) Å, c = 14.296(2) Å
Ratio:
a:c = 1 : 2.577
Unit Cell V:
380.97 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.21 (100)
3.543 (50)
2.706 (14)
2.568 (39)
2.381 (25)
1.982 (26)
1.640 (12)
1.498 (10)

Type Occurrence of GuidottiiteHide

Place of Conservation of Type Material:
Smithsonian Institution, Washington, D.C., USA, NMNH 174879.
Reference:
Wahle, M.W., Bujnowski, T.J., Guggenheim, S., Kogure, T. (2010) Guidottiite, the Mn-analogue of cronstedtite: A new serpentine group mineral from South Africa. Clays and Clay Minerals: 58: 364-378.

Synonyms of GuidottiiteHide

Relationship of Guidottiite to other SpeciesHide

Other Members of this group:
AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 : P1
AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon. m : Bm
Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.
CaryopiliteMn2+3Si2O5(OH)4Mon.
ChrysotileMg3(Si2O5)(OH)4Mon.
CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
KellyiteMn2+2Al(AlSiO5)(OH)4Hex.
LizarditeMg3(Si2O5)(OH)4
Népouite(Ni,Mg)3(Si2O5)(OH)4Orth.
PecoraiteNi3(Si2O5)(OH)4Mon.

Related Minerals - Nickel-Strunz GroupingHide

9.ED.ClinochrysotileMon. 2/m
9.ED.05DickiteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.05KaoliniteAl2(Si2O5)(OH)4Tric. 1 : P1
9.ED.05NacriteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.05Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4Mon. m : Bm
9.ED.10HalloysiteAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.10HisingeriteFe3+2(Si2O5)(OH)4 · 2H2OMon.
9.ED.10Halloysite-7ÅAl2(Si2O5)(OH)4Mon. m : Bb
9.ED.15AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 : P1
9.ED.15AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
9.ED.15Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon. m : Bm
9.ED.15Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.
9.ED.15CaryopiliteMn2+3Si2O5(OH)4Mon.
9.ED.15ChrysotileMg3(Si2O5)(OH)4Mon.
9.ED.15CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
9.ED.15Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
9.ED.15Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4Mon.
9.ED.15KellyiteMn2+2Al(AlSiO5)(OH)4Hex.
9.ED.15LizarditeMg3(Si2O5)(OH)4
9.ED.15ManandoniteLi2Al4(Si2AlB)O10(OH)8Orth.
9.ED.15Népouite(Ni,Mg)3(Si2O5)(OH)4Orth.
9.ED.15PecoraiteNi3(Si2O5)(OH)4Mon.
9.ED.20Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2OAmor.
9.ED.20ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2OOrth.
9.ED.20ImogoliteAl2SiO3(OH)4
9.ED.20Neotocite(Mn,Fe,Mg)SiO3 · H2OAmor.
9.ED.25BismutoferriteFe3+2Bi(SiO4)2(OH)Mon. m : Bm
9.ED.25ChapmaniteFe3+2Sb3+(Si2O5)O3(OH)Mon. m : Bm

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

71.1.4.7CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m

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 GuidottiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Williams, P.A., Hatert, F., Pasero, M. (2009) New minerals approved in 2009. in International Mineralogical Association: 1-34.
Wahle, M.W., Bujnowski, T.J., Guggenheim, S., Kogure, T. (2010) Guidottiite, the Mn-analogue of cronstedtite: A new serpentine group mineral from South Africa. Clays and Clay Minerals: 58: 364-378.
Belakovskiy, D., Diego Gatta, G., Cámara, F. (2014) New mineral names. American Mineralogist: 99: 242-247.

Internet Links for GuidottiiteHide

Localities for GuidottiiteHide

ⓘ - 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.
South Africa (TL)
 
  • Northern Cape Province
    • Kalahari manganese field
      • Kuruman
        • N'Chwaning Mines
Wahle, M.W., Bujnowski, T.J., Guggenheim, S., Kogure, T. (2010): Guidottiite, the Mn-analogue of cronstedtite: A new serpentine group mineral from South Africa. Clays and Clay Minerals, 58, 364-378.
Mineral and/or Locality  
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