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Paradamite

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Formula:
Zn2AsO4(OH)
System:
Triclinic
Colour:
pale yellow
Lustre:
Vitreous, Sub-Vitreous, Resinous
Hardness:
Name:
Named in 1956 by George Switzer from the Greek παρα for "near", para-, and Adamite in allusion to its polymorphic relationship to that species.
Dimorph of:
Isostructural with:
Tarbuttite Group. The triclinic dimorph of Adamite.


Classification of Paradamite

Approved, 'Grandfathered' (first described prior to 1959)
8.BB.35

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
B : With only medium-sized cations, (OH, etc.):RO4 about 1:1
41.6.7.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq
20.3.2

20 : Arsenates (also arsenates with phosphate, but without other anions)
3 : Arsenates of Zn, Cd or Hg

Physical Properties of Paradamite

Vitreous, Sub-Vitreous, Resinous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
pale yellow
Streak:
white
Hardness (Mohs):
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
Perfect
{010}
Density:
4.55 g/cm3 (Measured)    4.595 g/cm3 (Calculated)

Optical Data of Paradamite

Type:
Biaxial (-)
RI values:
nα = 1.726 nβ = 1.771 nγ = 1.780
2V:
Measured: 50° , Calculated: 46°
Birefringence:
0.054
Max Birefringence:
δ = 0.054
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively strong
Optical Extinction:
inclined
Pleochroism:
Non-pleochroic

Chemical Properties of Paradamite

IMA Formula:
Zn2AsO4(OH)
Elements listed in formula:

Crystallography of Paradamite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.638(3) Å, b = 5.827(3) Å, c = 6.692(2) Å
α = 103.25(4)°, β = 104.37(3)°, γ = 87.72(4)°
Ratio:
a:b:c = 0.968 : 1 : 1.148
Unit Cell Volume:
V 207.27 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Individual steeply angular, platy to prismatic, isolated crystals are usual, but may be rounded or occur in sheaf-like globular aggregates showing acute terminations. Crystals striated on {001} and {100}, but not on {010}. This mineral does not visually closely resemble its namesake, adamite.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
6.32 (70)
5.46 (50)
3.70 (100)
2.99 (100)
2.84 (100)
2.57 (50)
2.51 (50)
2.48 (70)

Type Occurrence of Paradamite

Geological Setting of Type Material:
Oxidized zone of a polymetallic ore deposit
Associated Minerals at Type Locality:

Relationship of Paradamite to other Species

Other Members of Group:
TarbuttiteZn2(PO4)(OH)
8.BB.XArsenowagneriteMg2AsO4F
8.BB.05AmblygoniteLiAlPO4F
8.BB.05MontebrasiteLiAlPO4(OH)
8.BB.05TavoriteLiFe3+PO4(OH)
8.BB.10Triplite(Mn2+,Fe2+)2PO4(F,OH)
8.BB.10ZwieseliteFe2+Mn2+PO4F
8.BB.15SarkiniteMn22+AsO4(OH)
8.BB.15TriploiditeMn22+(PO4)(OH)
8.BB.15WagneriteMg2PO4F
8.BB.15WolfeiteFe22+PO4(OH)
8.BB.15StanĕkiteFe3+Mn2+O(PO4)
8.BB.15JoosteiteMn2+Mn3+O(PO4)
8.BB.15HydroxylwagneriteMg2PO4(OH)
8.BB.20HoltedahliteMg12(PO3OH,CO3)(PO4)5(OH,O)6
8.BB.20Satterlyite(Fe2+,Mg,Fe3+)12(PO3OH)(PO4)5(OH,O)6
8.BB.25AlthausiteMg4(PO4)2(OH,O)(F,◻)
8.BB.30AdamiteZn2AsO4(OH)
8.BB.30EveiteMn22+AsO4(OH)
8.BB.30LibetheniteCu2PO4(OH)
8.BB.30OliveniteCu2AsO4(OH)
8.BB.30ZincolibetheniteCuZnPO4OH
8.BB.30ZincoliveniteCuZnAsO4(OH)
8.BB.30AuriacusiteFe3+Cu2+AsO4O
8.BB.35TarbuttiteZn2(PO4)(OH)
8.BB.40BarbosaliteFe2+Fe23+(PO4)2(OH)2
8.BB.40HentscheliteCuFe23+(PO4)2(OH)2
8.BB.40LazuliteMgAl2(PO4)2(OH)2
8.BB.40ScorzaliteFe2+Al2(PO4)2(OH)2
8.BB.40WilhelmkleiniteZnFe23+(AsO4)2(OH)2
8.BB.45TrolleiteAl4(PO4)3(OH)3
8.BB.50NamibiteCu(BiO)2VO4(OH)
8.BB.55Phosphoellenbergerite(Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
8.BB.60UrusoviteCuAlO(AsO4)
8.BB.65TheoparacelsiteCu3(OH)2As2O7
8.BB.70TuraniteCu52+(VO4)2(OH)4
8.BB.75StoiberiteCu5O2(VO4)2
8.BB.80FingeriteCu11O2(VO4)6
8.BB.85AverieviteCu5O2(VO4)2 · CuCl2
8.BB.90LipscombiteFe2+Fe23+(PO4)2(OH)2
8.BB.90RichelliteCaFe23+(PO4)2(OH,F)2
8.BB.90ZinclipscombiteZnFe23+(PO4)2(OH)2
20.3.1AdamiteZn2AsO4(OH)
20.3.3KoritnigiteZn(AsO3OH) · H2O
20.3.4LegranditeZn2AsO4(OH) · H2O
20.3.5WarikahniteZn3(AsO4)2 · 2H2O
20.3.6KöttigiteZn3(AsO4)2 · 8H2O
20.3.7StranskiiteCuZn2(AsO4)2
20.3.8Philipsburgite(Cu,Zn)6(AsO4,PO4)2(OH)6 · H2O
20.3.9AustiniteCaZnAsO4(OH)
20.3.10ProsperiteCa2Zn4(AsO4)4 · H2O
20.3.11GaititeCa2Zn(AsO4)2 · 2H2O
20.3.12ZincroseliteCa2Zn(AsO4)2 · 2H2O
20.3.13O'DanieliteH2NaZn3(AsO4)3
20.3.14JohilleriteNaCuMg3(AsO4)3
20.3.15HoldeniteMn62+Zn3(AsO4)2(SiO4)(OH)8
20.3.16ChudobaiteMg5(AsO4)2(AsO3OH)2 · 10H2O
20.3.17Chlorophoenicite(Mn,Mg,Zn)3Zn2AsO4(OH,O)6
20.3.18LotharmeyeriteCaZn2(AsO4)2 · 2H2O
20.3.19Metaköttigite(Zn,Fe3+)3(AsO4)2 · 8(H2O,OH)
20.3.20OjuelaiteZnFe23+(AsO4)2(OH)2 · 4H2O
20.3.21FahleiteCaZn5Fe23+(AsO4)6 · 14H2O
20.3.22KeyiteCu32+Zn4Cd2(AsO4)6 · 2H2O

Other Names for Paradamite

Name in Other Languages:

Other Information

Not fluorescent from Ojuela Mine, Mapimi, Durango, Mexico.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Paradamite

Reference List:
Switzer, G. (1956): Paradamite, a new zinc arsenate from Mexico. Science 123, 1039.
American Mineralogist (1956): 41: 958.
Bennett, T. (1980): Crystal structure of paradamite. American Mineralogist 65, 353-354.
Kato, T. & Miura, Y. (1977): The crystal structures of adamite and paradamite. Mineralogical Journal 8, 320-328.
Hawthorne, F. C. (1979): Paradamite. Acta Crystallogr., B35, 720-722.

Internet Links for Paradamite

mindat.org URL:
https://www.mindat.org/min-3086.html
Please feel free to link to this page.
Specimens:
The following Paradamite specimens are currently listed for sale on minfind.com.

Localities for Paradamite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany
 
  • North Rhine-Westphalia
    • Sauerland
      • Iserlohn
        • Letmathe
Bender, D.; Krimmelbein, M. & W; Altena (1994): Aktuelle Übersicht: Mineralien der Zinkhütte Genna/Sauerland. in Mineralien-Welt, 4, p.10
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
No reference listed
Lapis No.7/8 1999 p.70-74
Mexico (TL)
 
  • Durango
    • Mun. de Mapimí
      • Mapimí
Science (1956) 123, p. 1039; Rocks & Min.: 56:247.
Thomas P. Moore (2008) Lapis, 33, #7-8, 33-40.
  • Nuevo Leon
    • Mun. de Lampazos de Naranjo
      • Lampazos de Naranjo (Lampazos)
Mike Shannon
Namibia
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Gebhard, G. (1999): Tsumeb II. A Unique Mineral Locality. GG Publishing, Grossenseifen, Germany
Mineral and/or Locality  
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