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.

Name Pronunciation:

Roscherite + Pronunciation

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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Forms: ( 0 1 0) ( 1 0 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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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
Ncalc = 1.6 - 1.62

Optical Data:

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

Calculated Properties of Roscherite

Electron Density:

Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Roscherite =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Roscherite= 7.93 barns/electron
U=PE_Roscherite x rElectron Density= 22.90 barns/cc.

Radioactivity:

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

Roscherite Classification

Dana Class:

42.07.07.01 (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 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 - 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
13 - WWW-MINCRYST

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

Roscherite

Ca(Mn++,Fe++)5Be4(PO4)6(OH)4•6(H2O)
Dana No: 42.07.07.01 Strunz No: 08.DA.10
Locality:

Notes: