Sainfeldite Mineral Data

Sainfeldite Mineral Data +

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General Sainfeldite Information

Chemical Formula:

Ca5(AsO3OH)2(AsO4)2·4(H2O)

Composition:

Molecular Weight = 830.14 gm

Calcium 24.14 % Ca 33.78 % CaO

Arsenic 36.10 % As 55.37 % As₂O₅

Hydrogen 1.21 % H 10.85 % H₂O

Oxygen 38.55 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅(AsO₃OH)₂(AsO₄)₂·4(H₂O)

IMA Status:

Approved IMA 1964

Locality:

40m level, Gabe Gottes vein, Ste. Marie-aux-Mines, Vosges Mountains, Alsace, France. Link to MinDat.org Location Data.

Name Origin:

Named for Paul Sainfeld (1916-), Musee des Mineralogie, Ecole des Mines, Paris.

Synonym:

ICSD 21068

PDF 16-615

Sainfeldite Image

Images:

Sainfeldite

Comments: Rose-colored crystalline aggregate of Sainfeldite.
Location: Wechsel Schacht, Richelsdorf, Hesse, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Sainfeldite Crystallography

Axial Ratios:

a:b:c =1.9001:1:1.0316

Cell Dimensions:

a = 18.64, b = 9.81, c = 10.12, Z = 4; beta = 97° V = 1,836.73 Den(Calc)= 3.00

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): 3.37(1), 3.18(0.8), 8.7(0.6),

Crystal Structure:

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Ferraris G , Abbona F , Bulletin de la Societe Francaise de Mineralogie et de Cristallographie , 95 (1972) p.33-41, The crystal structure of Ca5(HAsO4)2(AsO4)2*4H2O (Sainfeldite), Locality: synthetic

Physical Properties of Sainfeldite

Color:

Colorless, Light pink.

Density:

3.04

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

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

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Sainfeldite

Gladstone-Dale:

CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2029,KPDmeas= 0.2002,KC= 0.1975

Optical Data:

Biaxial (-), a=1.6, b=1.61, g=1.616, bire=0.0160, 2V(Calc)=74, 2V(Meas)=80.

Calculated Properties of Sainfeldite

Electron Density:

r_electron=2.94 gm/cc
note: r_Sainfeldite=3.04 gm/cc.

Fermion Index

Fermion Index = 0.00051
Boson Index = 0.99949

Photoelectric:

PE_Sainfeldite= 27.22 barns/electron
U=PE_Sainfeldite x r_electron= 80.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sainfeldite is Not Radioactive

Sainfeldite Classification

Dana Class:

39.2.1.2 (39)Hydrated Acid Phosphates, etc

(39.2)H2 (AB)5 (XO4)4 · x(H2O)

(39.2.1)Dana Group

39.2.1.1 Hureaulite Mn5(PO3OH)2(PO4)2·4(H2O) C 2/c 2/m

39.2.1.2 Sainfeldite Ca5(AsO3OH)2(AsO4)2·4(H2O) C 2/c 2/m

39.2.1.3 Villyaellenite Mn5(AsO3OH)2(AsO4)2·4(H2O) C 2/c 2/m

Strunz Class:

VII/C.04-20 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.04 - Hureaulite - Villyaellenite series

VII/C.04-10 Hureaulite Mn5(PO3OH)2(PO4)2·4(H2O) C 2/c 2/m

VII/C.04-20 Sainfeldite Ca5(AsO3OH)2(AsO4)2·4(H2O) C 2/c 2/m

VII/C.04-30 Villyaellenite Mn5(AsO3OH)2(AsO4)2·4(H2O) C 2/c 2/m

Other Sainfeldite Information

References:

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

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

Sainfeldite

Ca5(AsO3OH)2(AsO4)2·4(H2O)
Dana No: 39.2.1.2 Strunz No: VII/C.04-20
Locality:

Notes: