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General Hornesite Information

Help on Chemical  Formula: Chemical Formula: Mg3(AsO4)2·8(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mg3(AsO4)2·8(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1860
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Synonym: Synonym: Hoernesite
 

Hornesite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.7633:1:0.3526
Help on Cell Dimensions: Cell Dimensions: a = 10.26, b = 13.44, c = 4.74, Z = 2; beta = 104.9° V = 631.64 Den(Calc)= 2.60
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.692(1), 2.712(0.5), 3.005(0.5),
 

Physical Properties of Hornesite

Help on Color: Color: White.
Help on Density: Density: 2.57
Help on Diaphaniety: Diaphaniety: Transparent
Help on Hardness: Hardness: 1 - Talc
Help on Luster: Luster: Pearly
 

Optical Properties of Hornesite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density:

relectron=2.58 gm/cc
note: rHornesite =2.60 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01498
Boson Index = 0.98502
Help on Photoelectric: Photoelectric:

PEHornesite = 20.16 barns/electron
U=PEHornesite x relectron= 52.10 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hornesite is Not Radioactive

 

Hornesite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Athena) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Hornesite

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

 

Notes:

 

 
   
 
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