Roscherite Mineral Data

Roscherite Mineral Data +

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General Roscherite Information

Chemical Formula:

Ca(Mn++,Fe++)5Be4(PO4)6(OH)4·6(H2O)

Composition:

Molecular Weight = 1,097.90 gm

Calcium 3.65 % Ca 5.11 % CaO

Manganese 18.76 % Mn 24.23 % MnO

Beryllium 3.28 % Be 9.11 % BeO

Iron 6.36 % Fe 8.18 % FeO

Phosphorus 16.93 % P 38.79 % P₂O₅

Hydrogen 1.47 % H 13.13 % H₂O

Oxygen 49.55 % O

______ ______

100.00 % 98.54 % = TOTAL OXIDE

Empirical Formula:

CaMn²⁺_3.75Fe²⁺_1.25Be₄(PO₄)₆(OH)₄·6(H₂O)

Environment:

Cavities in granite. Two polymorphs recorded, A (triclinic) and M (monoclinic).

IMA Status:

Valid Species (Pre-IMA) 1914

Locality:

Greifenstein, near Ehrenfridersdorf, Saxony, Germay. Link to MinDat.org Location Data.

Name Origin:

Named for Walter Roscher, mineral collector of Ehrenfriedsdorf, Germany.

Roscherite Image

Images:

Roscherite Hurlbutite

Comments: White, round crystal clusters of hurlbutite on reddish brown roscherite.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Roscherite Parafransoletite

Comments: White, crystalline aggregate sprays of parafransoletite on dark reddish brown roscherite with massive, white, sucrosic whitlockite.
Location: Tip Top mine, Custer County, South Dakota, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Images:

Roscherite Englishite

Comments: Black crystalline aggregate of roscherite on white englishite.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Roscherite Viitaniemiite

Comments: Colorless to pink viitaniemiite with brownish roscherite.
Location: Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Roscherite Ushkovite

Comments: Translucent ushkovite microcrystals with orange roscherite on feldspar.
Location: Galileia, Minas Gerais, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Roscherite Crystallography

Axial Ratios:

a:b:c =1.3306:1:0.5633

Cell Dimensions:

a = 15.921, b = 11.965, c = 6.741, Z = 2; alpha = 91.067°, beta = 94.35°, gamma = 89.942° V = 1,280.20 Den(Calc)= 2.85

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: C1

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

By Intensity(I/I_o): 5.96(1), 9.58(0.9), 3.18(0.7),

Forms:

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Crystal Structure:

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Fanfani L , Zanazzi P F , Zanzari A R , Tschermaks Mineralogische und Petrographische Mitteilungen , 24 (1977) p.169-178, The crystal structure of a triclinic roscherite, Note: B(3,3) changed from .00848 to .00488 to match reported Biso, Locality: Foote Mine, North Carolina, USA

Physical Properties of Roscherite

Cleavage:

[001] Good, [010] Distinct

Color:

Light brown, Dark brown, Olive green, Orange red, Red.

Density:

2.934

Habit:

Pistolitic - > 3mm rounded spherical grains.

Hardness:

4.5 - Between Fluorite and Apatite

Streak:

light brown

Optical Properties of Roscherite

Gladstone-Dale:

CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2229,KPDmeas= 0.2165,KC= 0.2113

Optical Data:

Biaxial (-), a=1.624, b=1.639, g=1.643, bire=0.0190

Calculated Properties of Roscherite

Electron Density:

r_electron=2.89 gm/cc
note: r_Roscherite=2.93 gm/cc.

Fermion Index

Fermion Index = 0.03447
Boson Index = 0.96553

Photoelectric:

PE_Roscherite= 7.93 barns/electron
U=PE_Roscherite x r_electron= 22.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Roscherite is Not Radioactive

Roscherite Classification

Dana Class:

42.7.7.1 (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.01-60 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 Roscherite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Roscherite :
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 11 - WWW-MINCRYST

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Roscherite

Ca(Mn++,Fe++)5Be4(PO4)6(OH)4·6(H2O)
Dana No: 42.7.7.1 Strunz No: VII/D.01-60
Locality:

Notes: