Parasymplesite Mineral Data

Parasymplesite Mineral Data +

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General Parasymplesite Information

Chemical Formula:

Fe++3(AsO4)2·8(H2O)

Composition:

Molecular Weight = 589.50 gm

Iron 28.42 % Fe 36.56 % FeO

Arsenic 25.42 % As 38.99 % As₂O₅

Hydrogen 2.74 % H 24.45 % H₂O

Oxygen 43.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺₃(AsO₄)₂·8(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1837

Locality:

Kiura, Ohita, Japan Link to MinDat.org Location Data.

Name Origin:

Named from the Greek "to bring together", in allusion to its relations to other minerals. Dimorphous with symplesite.

Synonym:

ICSD 30646

PDF 42-536

Parasymplesite Image

Images:

Parasymplesite

Comments: Opaque, prismatic parasymplesite crystals.
Location: Ojuela mine, Mapimi, Durango, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Parasymplesite Crystallography

Axial Ratios:

a:b:c =0.7657:1:0.3543

Cell Dimensions:

a = 10.349, b = 13.515, c = 4.789, Z = 2; beta = 104.92° V = 647.24 Den(Calc)= 3.02

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 6.75(1), 3.025(0.5), 8.057(0.3),

Physical Properties of Parasymplesite

Cleavage:

[010] Perfect

Color:

Greenish blue, Light greenish blue.

Density:

3.07

Diaphaniety:

Translucent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

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

Hardness:

2 - Gypsum

Luster:

Silky

Streak:

white

Optical Properties of Parasymplesite

Gladstone-Dale:

CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.22,KPDmeas= 0.2164,KC= 0.215

Optical Data:

Biaxial (-), a=1.628, b=1.66, g=1.705, bire=0.0770

Pleochroism (x):

deep blue.

Pleochroism (y):

nearly colorless.

Pleochroism (z):

colorless.

Calculated Properties of Parasymplesite

Electron Density:

r_electron=3.00 gm/cc
note: r_{Parasymplesite}=3.07 gm/cc.

Fermion Index

Fermion Index = 0.00623
Boson Index = 0.99377

Photoelectric:

PE_{Parasymplesite}= 25.38 barns/electron
U=PE_{Parasymplesite} x r_electron= 76.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Parasymplesite is Not Radioactive

Parasymplesite Classification

Dana Class:

40.3.6.6 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.6)Dana Group

40.3.6.1 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

40.3.6.2 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

40.3.6.3 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.4 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.5 Kottigite Zn3(AsO4)2·8(H2O) C 2/m 2/m

40.3.6.6 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

40.3.6.7 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.8 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

40.3.6.9 IMA2004-021! Co3(PO4)2·8(H2O) C 2/m 2/m

Strunz Class:

VII/C.13-60 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.13 - Vivianite group

VII/C.13-10 Bobierrite Mg3(PO4)2·8(H2O) C 2/c 2/m

VII/C.13-20* Cattiite! Mg3(PO4)2·22(H2O) P1 1

VII/C.13-20 Manganese-hornesite (Mn,Mg)3(AsO4)2·8(H2O) P 2₁/c 2/m

VII/C.13-30 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-40 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-45 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

VII/C.13-50 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-60 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

VII/C.13-70 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-80 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-90 Kottigite Zn3(AsO4)2·8(H2O) C 2/m 2/m

Other Parasymplesite Information

References:

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

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Parasymplesite

Fe++3(AsO4)2·8(H2O)
Dana No: 40.3.6.6 Strunz No: VII/C.13-60
Locality:

Notes: