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Hornesite Mineral Data

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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 Environment: Environment: Lmestone blocks, thermally metamorphosed, in a volcanic tuff (Fiano, Italy).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1860
Help on Locality: Locality: Banat, Hungary [probably Oravi�ta or Csiklova, Romania]. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Moritz Hornes (1815-1868), Curator of the Imperial Cabinet, Vienna, Austria.
Help on Name Pronunciation: Name Pronunciation: Hornesite + Pronunciation Say HORNESITE
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 - Prismatic H-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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.57 - 1.58
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: Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Hornesite =2.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEHornesite = 20.16 barns/electron
U=PEHornesite x rElectron Density= 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: 40.03.06.07 (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 � x(H2O)
  (40.03.06)Vivianite Group
 
40.03.06.01 Vivianite Fe3(PO4)2•8(H2O) C 2/m 2/m
 
40.03.06.02 Baricite (Mg,Fe)3(PO4)2•8(H2O) C 2/m 2/m
 
40.03.06.03 Erythrite Co3(AsO4)2•8(H2O) I2/m 2/m
 
40.03.06.04 Annabergite Ni3(AsO4)2•8(H2O) I2/m 2/m
 
40.03.06.05 Kottigite Zn3(AsO4)2•8(H2O) C 2/m 2/m
 
40.03.06.06 Parasymplesite Fe3(AsO4)2•8(H2O) C 2/m 2/m
 
40.03.06.07 Hornesite Mg3(AsO4)2•8(H2O) I2/m 2/m
 
40.03.06.08 Arupite (Ni,Fe)3(PO4)2•8(H2O) I2/m 2/m
 
40.03.06.09 Pakhomovskyite! Co3(PO4)2•8(H2O) C 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.CE.40 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.40 Arupite (Ni,Fe)3(PO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Annabergite Ni3(AsO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Baricite (Mg,Fe)3(PO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Erythrite Co3(AsO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Ferrisymplesite Fe3(AsO4)2(OH)3•5(H2O) None
 
08.CE.40 Hornesite Mg3(AsO4)2•8(H2O) I2/m 2/m
 
08.CE.40 Kottigite Zn3(AsO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Manganohornesite (Mn,Mg)3(AsO4)2•8(H2O) P 21/c 2/m
 
08.CE.40 Parasymplesite Fe3(AsO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Vivianite Fe3(PO4)2•8(H2O) C 2/m 2/m
 
08.CE.40 Pakhomovskyite! Co3(PO4)2•8(H2O) C 2/m 2/m
 

Other Hornesite Information

Help on References: References: NAME( AntBidBlaNic4) 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Hornesite

Mg3(AsO4)2•8(H2O)
Dana No: 40.03.06.07 Strunz No: 08.CE.40
Locality:

 

Notes:

 

 
   
 


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