Adamite Mineral Data

Adamite Mineral Data +

General Adamite Information

Chemical Formula:

Zn2(AsO4)(OH)

Composition:

Molecular Weight = 286.71 gm

Zinc 45.61 % Zn 56.78 % ZnO

Arsenic 26.13 % As 40.08 % As₂O₅

Hydrogen 0.35 % H 3.14 % H₂O

Oxygen 27.90 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn₂(AsO₄)(OH)

IMA Status:

Valid Species (Pre-IMA) 1866

Locality:

Chile, Atacama, Chañarcillo Link to MinDat.org Location Data.

Name Origin:

Named after the French mineralogist Gilbert Joseph Adam (1795-1881).

Synonym:

ICSD 34868

PDF 39-1354

Adamite Image

Images:

Adamite

Comments: Sprays of adamite with intense color and well defined crystals which stand out from the matrix.
Location: Ojuela mine, Mapimi, Durango, Mexico. Scale: 5 x 5 cm.
© Fabre Minerals

Images:

Adamite Cryptomelane

Comments: Black, rounded balls of cryptomelane and purple, transparent adamite.
Location: Ojuela mine, Mapimi, Druango, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Adamite Crystallography

Axial Ratios:

a:b:c =0.9744:1:0.7089

Cell Dimensions:

a = 8.306, b = 8.524, c = 6.043, Z = 4; V = 427.85 Den(Calc)= 4.45

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): 2.45(1), 2.97(0.9), 4.9(0.9),

Forms:

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Forms: [ 0 1 0] [ 1 1 0] [ 2 1 0] [ 1 0 1] [ 1 2 0]

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Crystal Structure:

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Hill R J , American Mineralogist , 61 (1976) p.979-986, The crystal structure and infrared properties of adamite

View Additional jPOWD Structure files for Adamite
[1]

Physical Properties of Adamite

Cleavage:

[101] Good, [010] Poor

Color:

Yellow, Green, Violet, Pink, Yellowish green.

Density:

4.3 - 4.5, Average = 4.4

Diaphaniety:

Subtransparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3.5 - Copper Penny

Luminescence:

Fluorescent and phosphorescent.

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Adamite

Gladstone-Dale:

CI meas= -0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1667,KPDmeas= 0.1686,KC= 0.1653

Optical Data:

Biaxial (+/-), a=1.708-1.722, b=1.742-1.744, g=1.763-1.773, bire=0.0510-0.0550, 2V(Calc)=74-84, 2V(Meas)=88. Dispersion none.

Calculated Properties of Adamite

Electron Density:

r_electron=4.16 gm/cc
note: r_Adamite=4.45 gm/cc.

Fermion Index

Fermion Index = 0.01883
Boson Index = 0.98117

Photoelectric:

PE_Adamite= 41.42 barns/electron
U=PE_Adamite x r_electron= 172.31 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Adamite is Not Radioactive

Adamite Classification

Dana Class:

41.6.6.3 (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.06-30 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 Adamite Information

References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Sinkankas66)

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

Adamite

Zn2(AsO4)(OH)
Dana No: 41.6.6.3 Strunz No: VII/B.06-30
Locality:

Notes: