Manganese-hornesite Mineral Data

Manganese-hornesite Mineral Data +

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General Manganese-hornesite Information

Chemical Formula:

(Mn,Mg)3(AsO4)2·8(H2O)

Composition:

Molecular Weight = 563.80 gm

Magnesium 3.23 % Mg 5.36 % MgO

Manganese 21.92 % Mn 28.31 % MnO

Arsenic 26.58 % As 40.77 % As₂O₅

Hydrogen 2.86 % H 25.56 % H₂O

Oxygen 45.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_2.25Mg_0.75(AsO₄)₂·8(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1951

Locality:

Link to MinDat.org Location Data.

Synonym:

Manganhornesite

Manganese-hornesite Image

Images:

Manganese-hornesite

Comments: Micro, white, needles of manganese-hornesite to about 0.75mm on hausmannite-rich matrix.
Location: Langban, Varmland, Sweden. Scale: 5.5 x 4 x 2.5cm.
© Tom Loomis / Dakota Matrix

Manganese-hornesite Crystallography

Axial Ratios:

a:b:c =0.3695:1:0.1699

Cell Dimensions:

a = 10.38, b = 28.09, c = 4.774, Z = 4; beta = 105.7° V = 1,340.04 Den(Calc)= 2.79

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 7.01(1), 8.19(0.8), 3.02(0.7),

Physical Properties of Manganese-hornesite

Color:

White.

Density:

2.64

Diaphaniety:

Transparent to Translucent

Hardness:

1 - Talc

Optical Properties of Manganese-hornesite

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2123,KPDmeas= 0.2244,KC= 0.2194

Optical Data:

Biaxial (+), a=1.579, b=1.589, g=1.609, bire=0.0300, 2V(Calc)=72, 2V(Meas)=65-70.

Calculated Properties of Manganese-hornesite

Electron Density:

r_electron=2.58 gm/cc
note: r_{Manganese-hornesite}=2.64 gm/cc.

Fermion Index

Fermion Index = 0.00345
Boson Index = 0.99655

Photoelectric:

PE_{Manganese-hornesite}= 23.33 barns/electron
U=PE_{Manganese-hornesite} x r_electron= 60.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manganese-hornesite is Not Radioactive

Manganese-hornesite Classification

Dana Class:

40.3.7.2 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.7)Dana Group

40.3.7.1 Bobierrite Mg3(PO4)2·8(H2O) C 2/c 2/m

40.3.7.2 Manganese-hornesite (Mn,Mg)3(AsO4)2·8(H2O) P 2₁/c 2/m

Strunz Class:

VII/C.13-20 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 Manganese-hornesite Information

References:

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

See Also:

Links to other databases for Manganese-hornesite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Manganese-hornesite Specimen Label here :

Manganese-hornesite

(Mn,Mg)3(AsO4)2·8(H2O)
Dana No: 40.3.7.2 Strunz No: VII/C.13-20
Locality:

Notes: