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.

Name Pronunciation:

Sainfeldite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.59 - 1.6

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:

Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Sainfeldite =3.04 gm/cc.

Fermion Index:

Fermion Index = 0.0005127216
Boson Index = 0.9994872784

Photoelectric:

PE_Sainfeldite= 27.22 barns/electron
U=PE_Sainfeldite x rElectron Density= 80.14 barns/cc.

Radioactivity:

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

Sainfeldite Classification

Dana Class:

39.02.01.02 (39)Hydrated Acid Phosphates, etc

(39.02)H2 (AB)5 (XO4)4 · x(H2O)

(39.02.01)Hureaulite Group

39.02.01.01 Hureaulite Mn5(PO3OH)2(PO4)2•4(H2O) C 2/c 2/m

39.02.01.02 Sainfeldite Ca5(AsO3OH)2(AsO4)2•4(H2O) C 2/c 2/m

39.02.01.03 Villyaellenite Mn5(AsO3OH)2(AsO4)2•4(H2O) C 2/c 2/m

39.02.01.04 IMA2008-047! Cd3Zn2(AsO3OH)2(AsO4)24?H2O C 2/c 2/m

39.02.01.05 IMA2008-066! Mn5(H2O)4(AsO3OH)2(AsO4)2 C 2/c 2/m

Strunz Class:

08.CB.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CB -With only medium-sized cations, RO4:H2O = 1:1

08.CB.10 Hureaulite Mn5(PO3OH)2(PO4)2•4(H2O) C 2/c 2/m

08.CB.10 Sainfeldite Ca5(AsO3OH)2(AsO4)2•4(H2O) C 2/c 2/m

08.CB.10 IMA2008-066! Mn5(H2O)4(AsO3OH)2(AsO4)2 C 2/c 2/m

08.CB.10 Villyaellenite Mn5(AsO3OH)2(AsO4)2•4(H2O) C 2/c 2/m

08.CB.10 IMA2008-047! Cd3Zn2(AsO3OH)2(AsO4)24?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)

See Also:

Links to other databases for Sainfeldite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Sainfeldite

Ca5(AsO3OH)2(AsO4)2•4(H2O)
Dana No: 39.02.01.02 Strunz No: 08.CB.10
Locality:

Notes: