Paradamite Mineral Data

General Paradamite 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)

Environment:

Secondary mineral in the oxidized sone of a Ag-Pb-Zn mine.

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Ojuela mine, Mapimi, Durango, Mexico Link to MinDat.org Location Data.

Name Origin:

Named as the dimorph of adamite.

Name Pronunciation:

Paradamite + Pronunciation

Paradamite Image

Images:

Paradamite

Comments: Yellow paradamite crystals on a gossanous matrix.
Location: Ojuela mine, Mapimi, Druango, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Paradamite Crystallography

Axial Ratios:

a:b:c =0.8687:1:0.8416

Cell Dimensions:

a = 5.83, b = 6.711, c = 5.648, Z = 2; alpha = 104.73°, beta = 92.26°, gamma = 76.81° V = 207.92 Den(Calc)= 4.58

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.698(1), 2.838(0.99), 2.994(0.96),

Physical Properties of Paradamite

Cleavage:

{010} Perfect

Color:

Light yellow.

Density:

4.55

Diaphaneity:

Transparent

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Paradamite

Gladstone-Dale:

CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1657,KPDmeas= 0.1668,KC= 0.1653
Ncalc = 1.75 - 1.76

Optical Data:

Biaxial (-), a=1.726, b=1.771, g=1.78, bire=0.0540, 2V(Calc)=46, 2V(Meas)=50.

Calculated Properties of Paradamite

Electron Density:

Bulk Density (Electron Density)=4.28 gm/cc
note: Specific Gravity of Paradamite =4.58 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Paradamite= 41.42 barns/electron
U=PE_Paradamite x rElectron Density= 177.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Paradamite is Not Radioactive

Paradamite Classification

Dana Class:

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

(41.06)where (A)2 (XO4) Zq

(41.06.07)Tarbuttite Group

41.06.07.01 Tarbuttite Zn2(PO4)(OH) P1 1

41.06.07.02 Paradamite Zn2(AsO4)(OH) P1 1

Strunz Class:

08.BB.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BB -With only medium-sized cations, (OH, etc.):RO4 ï¿½ 1:1

08.BB.35 Paradamite Zn2(AsO4)(OH) P1 1

08.BB.35 Tarbuttite Zn2(PO4)(OH) P1 1

Other Paradamite 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 Paradamite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Paradamite

Zn2(AsO4)(OH)
Dana No: 41.06.07.02 Strunz No: 08.BB.35
Locality:

Notes:

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