Greifensteinite Mineral Data

General Greifensteinite Information

Chemical Formula:

Ca2Be4(Fe++,Mn)5(PO4)6(OH)4•6(H2O)

Composition:

Molecular Weight = 1,108.19 gm

Calcium 7.09 % Ca 9.92 % CaO

Magnesium 0.20 % Mg 0.33 % MgO

Manganese 4.26 % Mn 5.51 % MnO

Beryllium 3.31 % Be 9.19 % BeO

Aluminum 0.56 % Al 1.06 % Al₂O₃

Iron 17.34 % Fe 22.30 % FeO

Phosphorus 16.66 % P 38.17 % P₂O₅

Hydrogen 1.51 % H 13.53 % H₂O

Oxygen 49.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_1.96Be_4.07Fe²⁺_3.44Mn²⁺_0.86Al_0.23Mg_0.09(PO₄)_5.96(OH)_3.65�6.5(H₂O)

Environment:

Miarolitic cavities in lithium-rich granite pegmatite. (Fe-dominant analogue of monoclinic roscherite and zanazziite; structure)

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Greifenstein, Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2001-044

Greifensteinite Image

Images:

Greifensteinite

Comments: Tabular crystal of greifensteinite impaled on acicular tourmaline.
Location: Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Greifensteinite Crystallography

Axial Ratios:

a:b:c =1.338:1:0.5618

Cell Dimensions:

a = 15.903, b = 11.885, c = 6.677, Z = 2; beta = 94.68° V = 1,257.79 Den(Calc)= 2.93

Crystal System:

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.48(1)(110), 3.96(0.9)(400), 2.783(0.8)(240),5.94(0.8)(020), 2.638(0.7)(600), 2.982(0.7)(202), 3.068(0.6)(510), 4.82(0.6)(310),

Physical Properties of Greifensteinite

Cleavage:

{100} Parting

Color:

Dark olive green.

Density:

2.93

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

green

Optical Properties of Greifensteinite

Gladstone-Dale:

CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2157,KPDmeas= 0.2157,KC= 0.2144
Ncalc = 1.63

Optical Data:

Biaxial (-), a=1.624, b=1.634, g=1.638, bire=0.0140

Calculated Properties of Greifensteinite

Electron Density:

Bulk Density (Electron Density)=2.90 gm/cc
note: Specific Gravity of Greifensteinite =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Greifensteinite}= 7.92 barns/electron
U=PE_{Greifensteinite} x rElectron Density= 22.96 barns/cc.

Radioactivity:

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

Greifensteinite Classification

Dana Class:

42.07.07.04 (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

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 Greifensteinite Information

References:

NAME( AmMin, 88:1176) PHYS. PROP.(AmMin, 88:1176) OPTIC PROP.(AmMin, 88:1176)

See Also:

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

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Greifensteinite

Ca2Be4(Fe++,Mn)5(PO4)6(OH)4•6(H2O)
Dana No: 42.07.07.04 Strunz No: 08.DA.10
Locality:

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