Guimarãesite (original) (raw)
A valid IMA mineral species
About GuimarãesiteHide
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Formula:
Ca2Be4Zn5(PO4)6(OH)4 · 6H2O
Specific Gravity:
2.963 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Djalma Guimarães (5 November 1894, Santa Luzia, Minas Gerais, Brazil - 10 October 1973, Belo Horizonte, Minas Gerais, Brazil), mineralogist and geochemist, in recognition of his important contributions to Brazilian mineralogy and geology. He taught at Ouro the Preto Mining School and at the Federal University of Minas Gerais.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:30764:4
f16bd049-4b71-4dc4-bf54-49fcfe4eca04
IMA Classification of GuimarãesiteHide
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Type description reference:
Chukanov, Nikita V., Atencio, Daniel, Zadov, Alexander E., Filho, Luis A.D. Menezes, Coutinho, Jose M.V. (2007) Guimarãesite, a New Zn-dominant Monoclinic Roscherite-group Mineral from Itinga, Minas Gerais, Brazil. New Data on Minerals, 42. 11-15
Classification of GuimarãesiteHide
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8.DA.10
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations
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.
| Symbol | Source | Reference |
|---|---|---|
| Grã | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of GuimarãesiteHide
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Cleavage:
Perfect
perfect cleavage on {100} and good cleavage on {010} (by analogy)
Fracture:
Irregular/Uneven
Density:
2.963 g/cm3 (Calculated)
Optical Data of GuimarãesiteHide
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RI values:
_n_α = 1.596(2) _n_β = 1.600(2) _n_γ = 1.602(2)
2V:
Measured: 55° to 75°, Calculated: 70°
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Pleochroism:
Non-pleochroic
Chemistry of GuimarãesiteHide
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Mindat Formula:
Ca2Be4Zn5(PO4)6(OH)4 · 6H2O
Crystallography of GuimarãesiteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 15.98(1) Å, b = 11.84(2) Å, c = 6.63(1) Å
β = 95.15(15)°
Ratio:
a:b:c = 1.35 : 1 : 0.56
Unit Cell V:
1,249.35 ų (Calculated from Unit Cell)
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.48 Å | (90) |
| 5.98 Å | (100) |
| 4.82 Å | (80) |
| 3.152 Å | (90) |
| 3.052 Å | (70) |
| 2.961 Å | (70) |
| 2.841 Å | (70) |
| 2.708 Å | (80) |
Geological EnvironmentHide
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Type Occurrence of GuimarãesiteHide
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General Appearance of Type Material:
peripheral zones (up to 0.1 mm thick) in crystals of roscherite-group minerals.
Place of Conservation of Type Material:
under the number DR591 in the Museu de Geociã ncias,
Instituto de Geociã ncias, Universidade de São Paulo, Rua do Lago, 562, 05508080, São Paulo, SP, Brazil.
Geological Setting of Type Material:
late fracture-filling mineral in a phosphate-rich granite pegmatite
Associated Minerals at Type Locality:
Reference:
Chukanov, N.V., Atencio, D., Zadov, A.E., Menezes, L.A.D., Coutinho, J.M.V. (2007) Guimarãesite, a new Zn-dominant monoclinic roscherite-group mineral from Itinga, Minas Gerais, Brazil. New Data on Minerals. Moscow: 42: 11-15.
Synonyms of GuimarãesiteHide
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Other Language Names for GuimarãesiteHide
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Relationship of Guimarãesite to other SpeciesHide
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Other Members of this group:
| Atencioite | Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : _P_1 |
|---|---|---|
| Footemineite | Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : _P_1 |
| Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| Okruschite | Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/m |
| Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O | Mon. 2/m : _B_2/b |
| Zanazziite | Ca2Mg5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 8.DA.05 | Bearsite | Be2(AsO4)(OH) · 4H2O | Mon. |
|---|---|---|---|
| 8.DA.05 | Moraesite | Be2(PO4)(OH) · 4H2O | Mon. m : B b |
| 8.DA.10 | Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/m |
| 8.DA.10 | Zanazziite | Ca2Mg5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Atencioite | Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : _P_1 |
| 8.DA.10 | Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Footemineite | Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : _P_1 |
| 8.DA.10 | Okruschite | Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| 8.DA.15 | Uralolite | Ca2Be4(PO4)3(OH)3 · 5H2O | Mon. 2/m |
| 8.DA.20 | Weinebeneite | CaBe3(PO4)2(OH)2 · 4H2O | Mon. m : B b |
| 8.DA.25 | Tiptopite | K2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O | Hex. 6 : _P_63 |
| 8.DA.40 | Spencerite | Zn4(PO4)2(OH)2 · 3H2O | Mon. 2/m : _P_2/b |
| 8.DA.45 | Glucine | CaBe4(PO4)2(OH)4 · 0.5H2O |
Fluorescence of GuimarãesiteHide
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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 GuimarãesiteHide
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References for GuimarãesiteHide
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Reference List:
Chukanov, Nikita V., Atencio, Daniel, Zadov, Alexander E., Filho, Luis A.D. Menezes, Coutinho, Jose M.V. (2007) Guimarãesite, a New Zn-dominant Monoclinic Roscherite-group Mineral from Itinga, Minas Gerais, Brazil. New Data on Minerals, 42. 11-15
Localities for GuimarãesiteHide
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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.
| Brazil (TL) | |
|---|---|
| Minas Gerais Itinga Taquaral Piauí valley ⓘ Guimarãesite occurrence (TL) | Chukanov et al. (2007) |
| ⓘ Ponte do Piauí claim | Luis Menezes +1 other reference |