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 % Fe₂O₃

Arsenic 25.42 % As 38.99 % As₂O₅

Hydrogen 2.74 % H 24.45 % H₂O

Oxygen 43.42 % O

______ ______

100.00 % 104.07 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₃(AsO₄)₂•8(H₂O)

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

Comments: Fan-shaped spray of acicular symplesite on matrix.
Location: Saubachthal, Saxony, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_Symplesite= 25.38 barns/electron
U=PE_Symplesite x rElectron 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 ï¿½ 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 ï¿½ 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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