Hornesite Mineral Data

Hornesite Mineral Data +

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General Hornesite Information

Chemical Formula:

Mg3(AsO4)2·8(H2O)

Composition:

Molecular Weight = 494.88 gm

Magnesium 14.73 % Mg 24.43 % MgO

Arsenic 30.28 % As 46.44 % As₂O₅

Hydrogen 3.26 % H 29.12 % H₂O

Oxygen 51.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₃(AsO₄)₂·8(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1860

Locality:

Link to MinDat.org Location Data.

Synonym:

Hoernesite

Hornesite Image

Images:

Hornesite

Comments: Aggregate of white pearly platy crystals of hornesite on matrix.
Location: Bauhaus, Richelsdorf, Hessen, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hornesite Crystallography

Axial Ratios:

a:b:c =0.7633:1:0.3526

Cell Dimensions:

a = 10.26, b = 13.44, c = 4.74, Z = 2; beta = 104.9° V = 631.64 Den(Calc)= 2.60

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

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

By Intensity(I/I_o): 6.692(1), 2.712(0.5), 3.005(0.5),

Physical Properties of Hornesite

Color:

White.

Density:

2.57

Diaphaniety:

Transparent

Hardness:

1 - Talc

Luster:

Pearly

Optical Properties of Hornesite

Gladstone-Dale:

CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2218,KPDmeas= 0.2244,KC= 0.2231

Optical Data:

Biaxial (+), a=1.563, b=1.571, g=1.596, bire=0.0330, 2V(Calc)=60, 2V(Meas)=60.

Calculated Properties of Hornesite

Electron Density:

r_electron=2.58 gm/cc
note: r_Hornesite=2.60 gm/cc.

Fermion Index

Fermion Index = 0.01498
Boson Index = 0.98502

Photoelectric:

PE_Hornesite= 20.16 barns/electron
U=PE_Hornesite x r_electron= 52.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hornesite is Not Radioactive

Hornesite Classification

Dana Class:

40.3.6.7 (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.13-50 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 Hornesite Information

References:

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

See Also:

Links to other databases for Hornesite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Hornesite Specimen Label here :

Hornesite

Mg3(AsO4)2·8(H2O)
Dana No: 40.3.6.7 Strunz No: VII/C.13-50
Locality:

Notes: