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Guimarãesite

Big Photo

Guimarãesite occurrence, Piauí valley, Taquaral, Itinga, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
© Knut Eldjarn

Show Guimarãesite Photos (7)
Formula:
Ca
 
2
(Zn,Mg,Fe
2+
 
)
 
5
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
System:Monoclinic


Roscherite Group.

Classification of Guimarãesite

IMA status:Approved 2006
Strunz 8th edition ID:7/D.01-53
Nickel-Strunz 10th (pending) edition ID:8.DA.10

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations
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Type Occurrence of Guimarãesite

Type Locality:Guimarãesite occurrence, Piauí valley, Taquaral, Itinga, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil

Crystallography of Guimarãesite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Cell Parameters:a = 15.98Å, b = 11.84Å, c = 6.63Å
β = 95.15°
Ratio:a:b:c = 1.35 : 1 : 0.56
Unit Cell Volume:V 1,249.35 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
9.48 (90)
5.98 (100)
4.82 (80)
3.152 (90)
3.052 (70)
2.961 (70)
2.841 (70)

Chemical Properties of Guimarãesite

Formula:
Ca
 
2
(Zn,Mg,Fe
2+
 
)
 
5
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
All elements listed in formula:Be, Ca, Fe, H, Mg, O, P, Zn

Relationship of Guimarãesite to other Species

Member of Group:
Roscherite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
8.DA.05Bearsite
Be
 
2
[OH|AsO
 
4
] · 4H
 
2
O
8.DA.05Moraesite
Be
 
2
[OH|PO
 
4
] · 4H
 
2
O
8.DA.10Roscherite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)
 
5
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
8.DA.10Zanazziite
Ca
 
2
(Mg,Fe)(Mg,Fe,Al)
 
4
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
8.DA.10Greifensteinite
Ca
 
2
(Fe
2+
 
, Mn)
 
5
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
8.DA.10Atencioite
Ca
 
2
Fe
2+
 
Mg
 
2
Fe
2+
2
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
8.DA.10Ruifrancoite
Ca
 
2
[ ]
 
2
(Fe
3+
 
,Mn
2+
 
,Mg)
 
4
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
(OH,H
 
2
O)
 
2
 · 4H
 
2
O
8.DA.10Footemineite
Ca
 
2
Mn
2+
 
Mn
2+
2
Mn
2+
2
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
8.DA.15Uralolite
Ca
 
2
Be
 
4
[OH|PO
 
4
]
 
3
 · 5H
 
2
O
8.DA.20Weinebeneite
CaBe
 
3
[OH|PO
 
4
]
 
2
 · 4H
 
2
O
8.DA.25Tiptopite
K
 
2
(Na,Ca)
 
2
Li
 
3
Be
 
6
[OH|(PO
 
4
)
 
3
]
 
2
 · H
 
2
O
8.DA.30Veszelyite
(Cu,Zn)
 
2
Zn(PO
 
4
)
 
2
·2H
 
2
O
8.DA.35Kipushite
(Cu,Zn)
 
5
Zn[(OH)
 
3
|PO
 
4
]
 
2
 · H
 
2
O
8.DA.35Philipsburgite
(Cu,Zn)
 
6
[(OH)
 
3
|(AsO
 
4
,PO
 
4
)]
 
2
 · H
 
2
O
8.DA.40Spencerite
Zn
 
4
[OH|PO
 
4
]
 
2
 · 3H
 
2
O
8.DA.45Glucine
CaBe
 
4
[(OH)
 
2
|PO
 
4
]
 
2
 · 0.5H
 
2
O

Other Names for Guimarãesite

Synonyms:
IMA2006-028
Other Languages:
German:Guimaraesit
Spanish:Guimaraesita

Other Information

Health Warning: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 Guimarãesite

Search Engines:
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    • External Links:
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  • Look for Guimarãesite on Wikipedia
  • Look for Guimarãesite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Guimarãesite in the Natural History Museum (London) online catalogue
    • Mineral Dealers:
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    Localities for Guimarãesite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Brazil
     
    • Southeast Region
      • Minas Gerais
        • Jequitinhonha valley
          • Itinga
            • Taquaral
              • Piauí valley
    		IMA website
    Mineral and/or Locality
    Google
     
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