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Guidottiite

A valid IMA mineral species
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About GuidottiiteHide

01432200015422295421103.jpg
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.
Isostructural with:

Unique IdentifiersHide

Mindat ID:
39763
Long-form identifier:
mindat:1:1:39763:8
GUID
(UUID V4):
25f7cd25-19ed-4bdd-b148-1d31a33eb747

IMA Classification of GuidottiiteHide

Classification of GuidottiiteHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
GdtIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
GdtWarr (2020)Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

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.

Chemistry of GuidottiiteHide

Mindat Formula:
Mn2Fe3+(Fe3+SiO5)(OH)4

Crystallography of GuidottiiteHide

Crystal System:
Hexagonal
Class (H-M):
6 - Pyramidal
Space Group:
P63
Setting:
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)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0018323GuidottiiteWahle 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 58 364-3762010N'chwaning 2 mine, Kalahari manganese field, South Africa0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.1480 Å(100)
4.8040 Å(13.97)
4.5538 Å(41.49)
3.9872 Å(16.69)
3.5740 Å(74.03)
3.3832 Å(16.78)
2.8675 Å(5.82)
2.7736 Å(1.07)
2.7228 Å(39.02)
2.5858 Å(95.46)
2.4570 Å(5.28)
2.3971 Å(42.37)
2.3827 Å(4.65)
2.1912 Å(13.14)
2.1449 Å(1.27)
2.1345 Å(1.79)
1.9936 Å(1.07)
1.9908 Å(40.42)
1.8795 Å(1.52)
1.8391 Å(1.68)
1.8157 Å(1.07)
1.8073 Å(13.58)
1.8013 Å(2.68)
1.8013 Å(1.81)
1.7870 Å(1.79)
1.7599 Å(1.62)
1.6967 Å(1.93)
1.6967 Å(1.45)
1.6446 Å(19.72)
1.6188 Å(1.06)
1.6013 Å(33.47)
1.5626 Å(13.12)
1.5559 Å(1.40)
1.5328 Å(1.05)
1.5022 Å(18.31)
1.4614 Å(12.58)
1.4296 Å(3.25)
1.3803 Å(3.45)
1.3784 Å(8.98)
1.3614 Å(14.14)
1.3316 Å(4.80)
1.3291 Å(5.14)
1.2707 Å(1.63)
1.2478 Å(5.38)
1.1986 Å(4.55)
1.1768 Å(2.77)
1.1473 Å(4.31)
1.0956 Å(4.28)
1.0946 Å(2.55)
Comments:
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, 364-376.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Type Occurrence of GuidottiiteHide

General Appearance of Type Material:
Columnar, with grains, ranging in size up to ~3 mm; poorly adhered to each other.
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian Institution), Washington, D.C., USA, NMNH 174879.
Geological Setting of Type Material:
Stratiform manganese deposit.
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. m : Bb
CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
KellyiteMn2+2Al(AlSiO5)(OH)4Hex. 6 : P63
LizarditeMg3(Si2O5)(OH)4Trig. 3m : P3 1m
NépouiteNi3Si2O5(OH)4Orth.
PecoraiteNi3(Si2O5)(OH)4Mon.

Related Minerals - Strunz-mindat 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.10HydrohalloysiteAl2Si2O5(OH)4 · 2H2OMon. m
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.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. 6 : P63
9.ED.15LizarditeMg3(Si2O5)(OH)4Trig. 3m : P3 1m
9.ED.15ManandoniteLi2Al4(Si2AlB)O10(OH)8Orth. 2 2 2 : C2 2 21
9.ED.15NépouiteNi3Si2O5(OH)4Orth.
9.ED.15PecoraiteNi3(Si2O5)(OH)4Mon.
9.ED.15 vaChromoamesiteMg2(Al,Cr)(AlSiO5)(OH)4
9.ED.20Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2OAmor.
9.ED.20ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1Orth.
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
9.ED.30PianliniteAl2Si2O6(OH)2Orth.

Fluorescence of GuidottiiteHide

Not fluorescent in UV

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.

Internet Links for GuidottiiteHide

References for GuidottiiteHide

Localities for GuidottiiteHide

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
South Africa (TL)
 
  • Northern Cape
    • John Taolo Gaetsewe District Municipality
      • Joe Morolong Local Municipality
        • N'Chwaning Mines
Wahle et al. (2010)
 
矿物 and/or 产地  
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