Symplesite Mineral Data
General Symplesite Information
Chemical Formula:
Fe++3(AsO4)2•8(H2O)
Composition:
Molecular Weight = 589.50 gm
Iron 28.42 % Fe 40.63 % Fe2 O3
Arsenic 25.42 % As 38.99 % As2 O5
Hydrogen 2.74 % H 24.45 % H2 O
Oxygen 43.42 % O
______ ______
100.00 % 104.07 % = TOTAL OXIDE
Empirical Formula:
Fe3+ 3 (AsO4 )2 •8(H2 O)
Environment:
Dimorphous with parasymplesite.
IMA Status:
Valid Species (Pre-IMA) 1837
Locality:
Lobenstein, Voigtland, Germany Link to MinDat.org Location Data.
Name Origin:
From the Greek, syn, "together" and plesiazein, "to associate."
Name Pronunciation:
Symplesite + Pronunciation
Symplesite Image
Images:
Symplesite Crystallography
Axial Ratios:
a:b:c =0.8469:1:0.5015
Cell Dimensions:
a = 7.97, b = 9.41, c = 4.72, Z = 1; alpha = 99.917°, beta = 97.383°, gamma = 105.967° V = 332.47 Den(Calc)= 2.94
Crystal System:
Triclinic - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 6.79(1), 7.5(0.16), 8.97(0.16),
Physical Properties of Symplesite
Cleavage:
{010} Perfect
Color:
Blue, Greenish black, Gray green, Light blue, Light green.
Density:
2.96 - 3, Average = 2.98
Diaphaneity:
Transparent to Translucent
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
2.5 - Finger Nail
Luster:
Vitreous - Pearly
Streak:
bluish white
Optical Properties of Symplesite
Gladstone-Dale:
CI meas = 0.182 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = 0.18 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.225,KPDmeas = 0.2243,KC = 0.2743 Ncalc = 1.81 - 1.82
Optical Data:
Biaxial (-), a=1.635, b=1.668, g=1.702, bire=0.0670, 2V(Calc)=88, 2V(Meas)=87.
Pleochroism (x):
deep blue.
Pleochroism (y):
colorless.
Pleochroism (z):
yellow.
Calculated Properties of Symplesite
Electron Density:
Bulk Density (Electron Density)=2.90 gm/cc note: Specific Gravity of Symplesite =2.97 gm/cc.
Fermion Index:
Fermion Index = 0.0062377496 Boson Index = 0.9937622504
Photoelectric:
PESymplesite = 25.38 barns/electronU=PESymplesite x r Electron Density= 73.66 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Symplesite is Not Radioactive
Symplesite Classification
Dana Class:
40.03.08.01 (40) Hydrated Phosphates, etc
(40.03) where (A++)3 (XO4)2 � x(H2O)
(40.03.08) Dana Group
40.03.08.01 Symplesite Fe3(AsO4)2•8(H2O) P1 1
40.03.08.02 Metakottigite (Zn,Fe,Fe)3(AsO4)2•8((H2O),OH) P1 1
Strunz Class:
08.CE.45 08 - PHOSPHATES, ARSENATES, VANADATES
08.C - Phosphates without Additional Anions, with H2O
08.CE -With only medium-sized cations, RO4:H2O � 1:2.5
08.CE.45 Symplesite Fe3(AsO4)2•8(H2O) P1 1
Other Symplesite Information
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
See Also:
Links to other databases for Symplesite :
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
16 - WWW-MINCRYST
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Print or Cut-and-Paste your Symplesite Specimen Label here :
Symplesite
Fe++3(AsO4)2•8(H2O)
Dana No: 40.03.08.01 Strunz No: 08.CE.45
Locality:
Notes:
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