Sainfeldite Mineral Data
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 % As2 O5
Hydrogen 1.21 % H 10.85 % H2 O
Oxygen 38.55 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca5 (AsO3 OH)2 (AsO4 )2 •4(H2 O)
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 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 - Prismatic H-M Symbol (2/m) Space Group: C 2/c
X Ray Diffraction:
By Intensity(I/Io ): 3.37(1), 3.18(0.8), 8.7(0.6),
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:
PESainfeldite = 27.22 barns/electronU=PESainfeldite x r Electron 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:
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