Guidottiite
A valid IMA mineral species
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About Guidottiite
Formula:
Mn2Fe3+(Fe3+SiO5)(OH)4
Colour:
Black
Lustre:
Vitreous, Silky
Hardness:
4 - 4½
Specific Gravity:
3.33
Crystal System:
Hexagonal
Member of:
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.
Type Locality:
Isostructural with:
Unique Identifiers
Mindat ID:
39763
Long-form identifier:
mindat:1:1:39763:8
GUID
(UUID V4):
(UUID V4):
25f7cd25-19ed-4bdd-b148-1d31a33eb747
IMA Classification of Guidottiite
Approved
IMA Formula:
Mn2Fe3+(SiFe3+)O5(OH)4
Approval year:
2009
First published:
2010
Classification of Guidottiite
9.ED.15
9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
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
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
Mineral Symbols
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.
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 Guidottiite
Vitreous, Silky
Transparency:
Opaque
Comment:
Vitreous in bulk, silky under magnification
Colour:
Black
Hardness:
4 - 4½ on Mohs scale
Cleavage:
Perfect
(001)
(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 Guidottiite
Mindat Formula:
Mn2Fe3+(Fe3+SiO5)(OH)4
Crystallography of Guidottiite
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 Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
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 Diffraction
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Guidottiite
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 Guidottiite
Relationship of Guidottiite to other Species
Member of:
Other Members of this group:
Amesite | Mg2Al(AlSiO5)(OH)4 | Tric. 1 : P1 |
Antigorite | Mg3(Si2O5)(OH)4 | Mon. m : Bm |
Berthierine | (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4 | Mon. m : Bm |
Brindleyite | (Ni,Al)3(Si,Al)2O5(OH)4 | Mon. |
Caryopilite | Mn2+3Si2O5(OH)4 | Mon. |
Chrysotile | Mg3(Si2O5)(OH)4 | Mon. m : Bb |
Cronstedtite | Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4 | Trig. 3m : P3 1m |
Fraipontite | (Zn,Al)3((Si,Al)2O5)(OH)4 | Mon. |
Kellyite | Mn2+2Al(AlSiO5)(OH)4 | Hex. 6 : P63 |
Lizardite | Mg3(Si2O5)(OH)4 | Trig. 3m : P3 1m |
Népouite | Ni3Si2O5(OH)4 | Orth. |
Pecoraite | Ni3(Si2O5)(OH)4 | Mon. |
Related Minerals - Strunz-mindat Grouping
9.ED. | Clinochrysotile | |
9.ED.05 | Dickite | Al2(Si2O5)(OH)4 |
9.ED.05 | Kaolinite | Al2(Si2O5)(OH)4 |
9.ED.05 | Nacrite | Al2(Si2O5)(OH)4 |
9.ED.05 | Odinite | (Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4 |
9.ED.10 | Halloysite | Al2(Si2O5)(OH)4 |
9.ED.10 | Hisingerite | Fe3+2(Si2O5)(OH)4 · 2H2O |
9.ED.10 | Hydrohalloysite | Al2Si2O5(OH)4 · 2H2O |
9.ED.15 | Amesite | Mg2Al(AlSiO5)(OH)4 |
9.ED.15 | Antigorite | Mg3(Si2O5)(OH)4 |
9.ED.15 | Berthierine | (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4 |
9.ED.15 | Brindleyite | (Ni,Al)3(Si,Al)2O5(OH)4 |
9.ED.15 | Caryopilite | Mn2+3Si2O5(OH)4 |
9.ED.15 | Cronstedtite | Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4 |
9.ED.15 | Fraipontite | (Zn,Al)3((Si,Al)2O5)(OH)4 |
9.ED.15 | Greenalite | (Fe2+,Fe3+)2-3Si2O5(OH)4 |
9.ED.15 | Kellyite | Mn2+2Al(AlSiO5)(OH)4 |
9.ED.15 | Lizardite | Mg3(Si2O5)(OH)4 |
9.ED.15 | Manandonite | Li2Al4(Si2AlB)O10(OH)8 |
9.ED.15 | Népouite | Ni3Si2O5(OH)4 |
9.ED.15 | Pecoraite | Ni3(Si2O5)(OH)4 |
9.ED.15 va | Chromoamesite | Mg2(Al,Cr)(AlSiO5)(OH)4 |
9.ED.20 | Allophane | (Al2O3)(SiO2)1.3-2 · 2.5-3H2O |
9.ED.20 | Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
9.ED.20 | Imogolite | Al2SiO3(OH)4 |
9.ED.20 | Neotocite | (Mn,Fe,Mg)SiO3 · H2O |
9.ED.25 | Bismutoferrite | Fe3+2Bi(SiO4)2(OH) |
9.ED.25 | Chapmanite | Fe3+2Sb3+(Si2O5)O3(OH) |
9.ED.30 | Pianlinite | Al2Si2O6(OH)2 |
Fluorescence of Guidottiite
Not fluorescent in UV
Other Information
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 Guidottiite
mindat.org URL:
https://www.mindat.org/min-39763.html
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References for Guidottiite
Localities for Guidottiite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
South Africa (TL) | |
| Wahle et al. (2010) |
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N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa