Greifensteinite Mineral Data

Greifensteinite Mineral Data

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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 - PrismaticH-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),

Crystal Structure:

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Rastsvetaeva R K , Gurbanova O A , Chukanov N V , Doklady Chemistry , 383 (2002) p.78-81, Crystal structure of greifensteinite, Ca2Be4(Fe2+,Mn)5(PO4)6(OH)4*6H2O, Locality: Greifenstein, Saxony, Germany

Physical Properties of Greifensteinite

Cleavage:

[100] Parting

Color:

Dark olive green.

Density:

2.93

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Greifensteinite

Electron Density:

r_electron=2.90 gm/cc
note: r_{Greifensteinite}=2.93 gm/cc.

Fermion Index

Fermion Index = 0.0373
Boson Index = 0.9627

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Greifensteinite is Not Radioactive

Greifensteinite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.7)Dana Group

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

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

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

42.7.7.5 IMA2004-041! Ca2Fe[]Mg2Fe2Be4(PO4)6(OH)4·6(H2O) P1 1

Strunz Class:

VII/D.01-55 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, mostly cations of small size: Be, Li

VII/D.01 - Moraesite - Uralolite - Roscherite series

VII/D.01-10 Moraesite Be2(PO4)(OH)·4(H2O) Cc,C 2/c Mono

VII/D.01-20 Bearsite Be2(AsO4)(OH)·4(H2O) Cc or C 2/c Mono

VII/D.01-30 Glucine CaBe4(PO4)2(OH)4·0.5(H2O) ? Mono

VII/D.01-35 Weinebeneite CaBe3(PO4)2(OH)2·5(H2O) Cc m

VII/D.01-40 Uralolite Ca2Be4(PO4)3(OH)3·5(H2O) P 2₁/n 2/m

VII/D.01-50 Zanazziite Ca2(Mg,Fe)(Mg,Fe,Al,Mn,Fe)4Be4(PO4)6(OH)4·6(H2O) C 2/c 2/m

VII/D.01-55 Greifensteinite Ca2Be4(Fe,Mn)5(PO4)6(OH)4·6(H2O) C 2/c 2/m

VII/D.01-60 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4·6(H2O) C1 1

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Greifensteinite

Ca2Be4(Fe++,Mn)5(PO4)6(OH)4·6(H2O)
Dana No: 42.7.7.4 Strunz No: VII/D.01-55
Locality:

Notes: