Eveite Mineral Data

Eveite Mineral Data +

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General Eveite Information

Chemical Formula:

Mn2(AsO4)(OH)

Composition:

Molecular Weight = 265.80 gm

Manganese 41.34 % Mn 53.38 % MnO

Arsenic 28.19 % As 43.24 % As₂O₅

Hydrogen 0.38 % H 3.39 % H₂O

Oxygen 30.10 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₂(AsO₄)(OH)

Environment:

Dimorphous with sarkinite. Secondary mineral found encrusting cavities in deposits containing Fe-Mn oxides and carbonates.

IMA Status:

Approved IMA 1967

Locality:

Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for its structural and chemical simularities to adamite.

Synonym:

ICSD 38426

PDF 22-1166

Eveite Image

Images:

Eveite Akrochordite

Comments: Micro crystals (to about 0.75mm) of very pale grayish green eveite in tiny vug with light pink akrochordite. Co-Type specimen & type locality.
Location: Langban, Varmland, Sweden. Scale: 13x10x4 mm.
© Tom Loomis / Dakota Matrix

Eveite Crystallography

Axial Ratios:

a:b:c =0.9771:1:0.7149

Cell Dimensions:

a = 8.57, b = 8.77, c = 6.27, Z = 4; V = 471.25 Den(Calc)= 3.75

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

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

By Intensity(I/I_o): 4.39(1), 3.058(0.9), 5.09(0.8),

Crystal Structure:

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Moore P B , Smyth J R , American Mineralogist , 53 (1968) p.1841-1845, Crystal chemistry of the basic manganese arsenates: III. The crystal structure, of eveite, Mn2(OH)(AsO4)

Physical Properties of Eveite

Cleavage:

[101] Good

Color:

Apple green.

Density:

3.76

Diaphaniety:

Transparent to Translucent

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Eveite

Gladstone-Dale:

CI meas= -0.019 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1908,KPDmeas= 0.1903,KC= 0.1867

Optical Data:

Biaxial (+), a=1.7, b=1.715, g=1.732, bire=0.0320, 2V(Calc)=88, 2V(Meas)=65.

Calculated Properties of Eveite

Electron Density:

r_electron=3.51 gm/cc
note: r_Eveite=3.76 gm/cc.

Fermion Index

Fermion Index = 0.00014
Boson Index = 0.99986

Photoelectric:

PE_Eveite= 30.49 barns/electron
U=PE_Eveite x r_electron= 106.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Eveite is Not Radioactive

Eveite Classification

Dana Class:

41.6.6.4 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.6)where (A)2 (XO4) Zq

(41.6.6)Dana Group

41.6.6.1 Olivenite Cu2AsO4(OH) P 2₁/n 2/m

41.6.6.2 Libethenite Cu2(PO4)(OH) Pnnm 2/m 2/m 2/m

41.6.6.3 Adamite Zn2(AsO4)(OH) Pnnm 2/m 2/m 2/m

41.6.6.4 Eveite Mn2(AsO4)(OH) Pnnm 2/m 2/m 2/m

41.6.6.5 Zincolibethenite! CuZn(PO4)OH Pnnm 2/m 2/m 2/m

Strunz Class:

VII/B.06-40 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.06 - Adamite group, Libethenite - Paradamite

VII/B.06-10 Libethenite Cu2(PO4)(OH) Pnnm 2/m 2/m 2/m

VII/B.06-20 Olivenite Cu2AsO4(OH) P 2₁/n 2/m

VII/B.06-30 Adamite Zn2(AsO4)(OH) Pnnm 2/m 2/m 2/m

VII/B.06-40 Eveite Mn2(AsO4)(OH) Pnnm 2/m 2/m 2/m

VII/B.06-50 Tarbuttite Zn2(PO4)(OH) P1 1

VII/B.06-60 Paradamite Zn2(AsO4)(OH) P1 1

Other Eveite Information

References:

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

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

Eveite

Mn2(AsO4)(OH)
Dana No: 41.6.6.4 Strunz No: VII/B.06-40
Locality:

Notes: