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Guimarãesite

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Big Photo

Piauí valley, Taquaral, Itinga, Jequitinhonha valley, Minas Gerais, Brazil
© M. Burkhardt

Show Guimarãesite Photos (15)



Formula:
Ca
 
2
(Zn,Mg,Fe
2+
 
)
 
5
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
System:Monoclinic
Member of:Roscherite Group


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, 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)
2.708 (80)

Chemical Properties of Guimarãesite

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

Relationship of Guimarãesite to other Species

Member of:Roscherite Group
Other Members of Group:

- +
Atencioite
Ca
 
2
Fe
2+
3
Mg
 
2
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
Footemineite
Ca
 
2
Mn
2+
 
Mn
2+
2
Mn
2+
2
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
Greifensteinite
Ca
 
2
Fe
2+
5
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
Roscherite
Ca
 
2
Mn
2+
5
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
Ruifrancoite
Ca
 
2
◻
 
2
(Fe
3+
 
,Mn
2+
 
,Mg)
 
4
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
(OH,H
 
2
O)
 
2
 · 4H
 
2
O
Zanazziite
Ca
 
2
Mg
 
5
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
 · 6H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

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

References for Guimarãesite

Reference List:

- +
Chukanov N V et al (2007) Guimarãesite, a new Zn-dominant monoclinic roscherite-group mineral from Itinga, Minas Gerais, Brazil, New Data on Minerals. Moscow, 42, 11-15

Internet Links for Guimarãesite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    • Localities for Guimarãesite

    Hide Locality List
    (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
     
    • Minas Gerais
      • Jequitinhonha valley
        • Itinga
          • Taquaral
            • Piauí valley
    		IMA website
    Luis Menezes
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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