Guidottiite (original) (raw)
A valid IMA mineral species
About GuidottiiteHide
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Formula:
Mn2Fe3+(Fe3+SiO5)(OH)4
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.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:39763:8
25f7cd25-19ed-4bdd-b148-1d31a33eb747
IMA Classification of GuidottiiteHide
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IMA Formula:
Mn2Fe3+(SiFe3+)O5(OH)4
Type description reference:
Classification of GuidottiiteHide
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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
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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.
| Symbol | Source | Reference |
|---|---|---|
| Gdt | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Gdt | Warr (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
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Comment:
Vitreous in bulk, silky under magnification
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
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Mindat Formula:
Mn2Fe3+(Fe3+SiO5)(OH)4
Crystallography of GuidottiiteHide
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Class (H-M):
6 - Pyramidal
Cell Parameters:
a = 5.5472(3) Å, c = 14.296(2) Å
Unit Cell V:
380.97 ų (Calculated from Unit Cell)
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0018323 | Guidottiite | 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 | 2010 | N'chwaning 2 mine, Kalahari manganese field, South Africa | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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
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Type Occurrence of GuidottiiteHide
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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
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Relationship of Guidottiite to other SpeciesHide
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Other Members of this group:
Related Minerals - Strunz-mindat GroupingHide
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| 9.ED. | Clinochrysotile | Mon. 2/m | |
|---|---|---|---|
| 9.ED.05 | Dickite | Al2(Si2O5)(OH)4 | Mon. m : B b |
| 9.ED.05 | Kaolinite | Al2(Si2O5)(OH)4 | Tric. 1 : _P_1 |
| 9.ED.05 | Nacrite | Al2(Si2O5)(OH)4 | Mon. m : B b |
| 9.ED.05 | Odinite | (Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4 | Mon. m : B m |
| 9.ED.10 | Halloysite | Al2(Si2O5)(OH)4 | Mon. m : B b |
| 9.ED.10 | Hisingerite | Fe3+2(Si2O5)(OH)4 · 2H2O | Mon. |
| 9.ED.10 | Hydrohalloysite | Al2Si2O5(OH)4 · 2H2O | Mon. m |
| 9.ED.15 | Amesite | Mg2Al(AlSiO5)(OH)4 | Tric. 1 : _P_1 |
| 9.ED.15 | Antigorite | Mg3(Si2O5)(OH)4 | Mon. m : B m |
| 9.ED.15 | Berthierine | (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4 | Mon. m : B m |
| 9.ED.15 | Brindleyite | (Ni,Al)3(Si,Al)2O5(OH)4 | Mon. |
| 9.ED.15 | Caryopilite | Mn2+3Si2O5(OH)4 | Mon. |
| 9.ED.15 | Cronstedtite | Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4 | Trig. 3_m_ : P_31_m |
| 9.ED.15 | Fraipontite | (Zn,Al)3((Si,Al)2O5)(OH)4 | Mon. |
| 9.ED.15 | Greenalite | (Fe2+,Fe3+)2-3Si2O5(OH)4 | Mon. |
| 9.ED.15 | Kellyite | Mn2+2Al(AlSiO5)(OH)4 | Hex. 6 : _P_63 |
| 9.ED.15 | Lizardite | Mg3(Si2O5)(OH)4 | Trig. 3_m_ : P_31_m |
| 9.ED.15 | Manandonite | Li2Al4(Si2AlB)O10(OH)8 | Orth. 222 : _C_2221 |
| 9.ED.15 | Népouite | Ni3Si2O5(OH)4 | Orth. |
| 9.ED.15 | Pecoraite | Ni3(Si2O5)(OH)4 | Mon. |
| 9.ED.15 va | Chromoamesite | Mg2(Al,Cr)(AlSiO5)(OH)4 | |
| 9.ED.20 | Allophane | (Al2O3)(SiO2)1.3-2 · 2.5-3H2O | Amor. |
| 9.ED.20 | Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 | Orth. |
| 9.ED.20 | Imogolite | Al2SiO3(OH)4 | |
| 9.ED.20 | Neotocite | (Mn,Fe,Mg)SiO3 · H2O | Amor. |
| 9.ED.25 | Bismutoferrite | Fe3+2Bi(SiO4)2(OH) | Mon. m : B m |
| 9.ED.25 | Chapmanite | Fe3+2Sb3+(Si2O5)O3(OH) | Mon. m : B m |
| 9.ED.30 | Pianlinite | Al2Si2O6(OH)2 | Orth. |
Fluorescence of GuidottiiteHide
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Other InformationHide
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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
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References for GuidottiiteHide
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Reference List:
Localities for GuidottiiteHide
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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
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- 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 ⓘ N'Chwaning II Mine (TL) | Wahle et al. (2010) |