Guimaraesite Mineral Data (original) (raw)

General Guimaraesite Information

Help on Chemical Formula: Chemical Formula:

Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O

Help on Composition: Composition:

Molecular Weight = 1,107.66 gm

Calcium 7.24 % Ca 10.13 % CaO

Magnesium 3.84 % Mg 6.37 % MgO

Beryllium 3.25 % Be 9.03 % BeO

Zinc 13.28 % Zn 16.53 % ZnO

Iron 5.04 % Fe 6.49 % FeO

Phosphorus 16.78 % P 38.44 % P2O5

Hydrogen 1.46 % H 13.01 % H2O

Oxygen 49.11 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Ca2Zn2.25Mg1.75Fe2+Be4(PO4)6(OH)4•6(H2O)

Help on Environment: Environment:

Roscherite group. Zinc analog of zanazziite.

Help on IMA Status: IMA Status:

Proposed IMA 2006

Help on Locality: Locality:

Granite pegmatite near the Piau� river, Itinga county, Minas Gerais, Brazil Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Commission on New Minerals, Nomenclature and Classification (CNMNC)

Help on Synonym: Synonym:

IMA2006-028

Guimaraesite Image

Click Here for Larger Guimaraesite Image in a New Browser Window Images:

Click Here for Larger Guimaraesite Image Guimaraesite Comments: Brown guimaraesite spheres and crystal aggregates.. Location: Piaui district, Itinga, Minas Gerais, Brazil.Scale: Specimen size 2 mm. © Diederik Visser

Click Here for Larger Guimaraesite Image in a New Browser Window Images:

Click Here for Larger Guimaraesite Image Guimaraesite Comments: Botryoidal guimaraesite on eosphorite. Location: Piaul District, Itinga, Minas Gerais, Brazil.Scale: Specimen size 1.1 x 0.9 x 0.8 cm. © Rob Lavinsky

Guimaraesite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =1.3496:1:0.5599

Help on Cell Dimensions: Cell Dimensions:

a = 15.98, b = 11.84, c = 6.63, Z = 2; beta = 95.15° V = 1,249.35 Den(Calc)= 2.94

Help on Crystal System: Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 5.98(1), 3.152(0.9), 9.48(0.9),4.82(0.8), 2.708(0.8), 2.961(0.7), 3.052(0.7), 2.841(0.7),

Physical Properties of Guimaraesite

Help on Color: Color:

Brown.

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Habit: Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Help on Luster: Luster:

Vitreous (Glassy)

Optical Properties of Guimaraesite

Help on Optical Data: Optical Data:

NCalc= 1.61 - from Gladstone-Dale relationship (KC = 0.2086) where Ncalc=Dcalc*KC+1

Calculated Properties of Guimaraesite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Guimaraesite =2.94 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Help on Photoelectric: Photoelectric:

PEGuimaraesite = 9.74 barns/electron
U=PEGuimaraesite x rElectron Density= 28.37 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Guimaraesite is Not Radioactive

Guimaraesite Classification

Help on Dana Class: Dana Class:

42.07.07.06 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq � x(H2O)

(42.07.07)Roscherite group

42.07.07.01 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1

42.07.07.03 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m

42.07.07.04 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m

42.07.07.05 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1

42.07.07.06 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m

42.07.07.07 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1

42.07.07.08 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m

Help on Strunz Class: Strunz Class:

08.DA.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DA -With small (and occasionally larger) cations

08.DA.10 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4•6(H2O) C1 1

08.DA.10 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4•6(H2O) C 2/c 2/m

08.DA.10 Footemineite! Ca2MnMn2Mn2Be4(PO4)6(OH)4•6H2O P1 1

08.DA.10 Atencioite! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4•6H2O P1 1

08.DA.10 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4•6(H2O) C 2/c 2/m

08.DA.10 Ruifrancoite! Ca2([],Mn)2(Fe,Mn,Mg)4Be4(PO4)6(OH)4•6H2O C 2/c 2/m

08.DA.10 Guimaraesite Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O C 2/c 2/m

Other Guimaraesite Information

Help on See Also: See Also:

Links to other databases for Guimaraesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Guimaraesite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Guimaraesite :

A Bijoux Google Search for Guimaraesite
Adam's Minerals Google Search for Guimaraesite
Cape Minerals Google Search for Guimaraesite
Dakota Matrix Minerals Google Search for Guimaraesite
Excalibur Mineral Corp. Google Search for Guimaraesite
Exceptional Minerals Google Search for Guimaraesite
John Betts Fine Minerals Search for Guimaraesite
McDougall Minerals Google Search for Guimaraesite
Mineral News Website Link
Rock and Mineral Shows Google Search for Guimaraesite
Weinrich Minerals, Inc. Google Search for Guimaraesite

Ask about Guimaraesite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

Print or Cut-and-Paste your Guimaraesite Specimen Label here :

Guimaraesite

Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4•6H2O
Dana No: 42.07.07.06 Strunz No: 08.DA.10
Locality:

Notes: