General Roscherite Information
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Chemical Formula: |
Ca(Mn++,Fe++)5Be4(PO4)6(OH)4·6(H2O) |
Composition: |
Molecular Weight = 1,097.90 gm |
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Calcium 3.65 % Ca 5.11 % CaO |
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Manganese 18.76 % Mn 24.23 % MnO |
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Beryllium 3.28 % Be 9.11 % BeO |
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Iron 6.36 % Fe 8.18 % FeO |
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Phosphorus 16.93 % P 38.79 % P2O5 |
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Hydrogen 1.47 % H 13.13 % H2O |
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Oxygen 49.55 % O |
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______ ______ |
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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. |
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Roscherite Image |
Images:
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Images:
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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 |
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Images:
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Images:
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Images:
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Roscherite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 5.96(1), 9.58(0.9), 3.18(0.7), |
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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
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Physical Properties of Roscherite
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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 |
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Optical Properties of Roscherite
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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 |
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Calculated Properties of Roscherite
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Electron Density: |
relectron=2.89 gm/cc note: rRoscherite =2.93 gm/cc. |
Fermion Index |
Fermion Index = 0.03447 Boson Index = 0.96553 |
Photoelectric: |
PERoscherite = 7.93 barns/electron U=PERoscherite x relectron= 22.90 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Roscherite is Not Radioactive |
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Roscherite Classification
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Dana Class: |
42.7.7.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.7)where (AB)5 (XO4)3 Zq · x(H2O) |
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(42.7.7)Dana Group |
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42.7.7.1 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4·6(H2O) C1 1 |
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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 |
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42.7.7.4 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4·6(H2O) C 2/c 2/m |
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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 |
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VII/D - Water-bearing phosphates with unfamiliar anions, mostly cations of small size: Be, Li |
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VII/D.01 - Moraesite - Uralolite - Roscherite series |
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VII/D.01-10 Moraesite Be2(PO4)(OH)·4(H2O) Cc,C 2/c Mono |
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VII/D.01-20 Bearsite Be2(AsO4)(OH)·4(H2O) Cc or C 2/c Mono |
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VII/D.01-30 Glucine CaBe4(PO4)2(OH)4·0.5(H2O) ? Mono |
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VII/D.01-35 Weinebeneite CaBe3(PO4)2(OH)2·5(H2O) Cc m |
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VII/D.01-40 Uralolite Ca2Be4(PO4)3(OH)3·5(H2O) P 21/n 2/m |
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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 |
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VII/D.01-55 Greifensteinite! Ca2Be4(Fe,Mn)5(PO4)6(OH)4·6(H2O) C 2/c 2/m |
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VII/D.01-60 Roscherite Ca(Mn,Fe)5Be4(PO4)6(OH)4·6(H2O) C1 1 |
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Other Roscherite Information
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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:
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