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Louis C. A. Legrand
Zn2(AsO4)(OH) · H2O
Yellow to colourless; pale yellow to colourless in transmitted light.
Vitreous, Sub-Vitreous, Resinous, Waxy
Specific Gravity:
3.98 - 4.01
Crystal System:
Named in 1932 by Julien Drugman and Max H. Hey in honor of Mr. Louis C.A. Legrand [born Liège, July 30 1861 - died Brussels February 23rd 1932], a Belgian mining engineer and mineral collector who collected the first specimens.
A secondary mineral occurring in the oxidized zones of arsenic- and zinc-bearing deposits.

The structure of legrandite (and paradamite) is characterized by the occurrence of proton transfer tunnels along crystal axes. Stability of legrandite is due to variety of hydrogen bonds, of which there are three types (linear normal one, one-acceptor; two-acceptor, linear + one weak excess one; several-acceptor, one linear + several weak additional ones). Hydrogen in legrandite is distributed among 2 OH and 2 water positions.

Visit for gemological information about Legrandite.

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Classification of LegranditeHide

Approved, 'Grandfathered' (first described prior to 1959)

D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

6 : A2(XO4)Zq·xH2O

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

Pronounciation of LegranditeHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of LegranditeHide

Vitreous, Sub-Vitreous, Resinous, Waxy
Transparent, Translucent
Yellow to colourless; pale yellow to colourless in transmitted light.
4½ on Mohs scale
Fair to poor on {100}
3.98 - 4.01 g/cm3 (Measured)    4.015 g/cm3 (Calculated)

Optical Data of LegranditeHide

Biaxial (+)
RI values:
nα = 1.675 - 1.702 nβ = 1.690 - 1.709 nγ = 1.735 - 1.740
Measured: 50° , Calculated: 52° to 62°
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r < v strong
Optical Extinction:
X = b; Z ^ c = 40°
X = Y = Colourless to yellow
Z = Yellow

Chemical Properties of LegranditeHide

Zn2(AsO4)(OH) · H2O
IMA Formula:
Zn2AsO4(OH) · H2O

Crystallography of LegranditeHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 12.805(2) Å, b = 7.933(1) Å, c = 10.215(2) Å
β = 104.23°
a:b:c = 1.614 : 1 : 1.288
Unit Cell V:
1,005.82 ų (Calculated from Unit Cell)
Crystals prismatic elongated [001], exhibiting dominant {110}, striated parallel to {001} and {111}, {100}, and {001}. Commonly in sprays or sheaflike aggregates.

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
12.36 (35)
6.68 (71)
5.93 (71)
4.19 (50)
4.08 (100)
3.08 (71)
3.03 (35)

Type Occurrence of LegranditeHide

Place of Conservation of Type Material:
NationalMuseum of Natural History, Washington
Natural History Museum, London
Geological Setting of Type Material:
Oxidized zone of an arsenic-bearing zinc deposit.
Associated Minerals at Type Locality:

Other Language Names for LegranditeHide

Simplified Chinese:水羟砷锌石

Common AssociatesHide

ScoroditeFe3+AsO4 · 2H2O
Associated Minerals Based on Photo Data:
Smithsonite34 photos of Legrandite associated with Smithsonite on
Limonite24 photos of Legrandite associated with Limonite on
Adamite17 photos of Legrandite associated with Adamite on
Paradamite14 photos of Legrandite associated with Paradamite on
Köttigite6 photos of Legrandite associated with Köttigite on
Willemite5 photos of Legrandite associated with Willemite on
Sphalerite4 photos of Legrandite associated with Sphalerite on
Calcite3 photos of Legrandite associated with Calcite on
Mimetite3 photos of Legrandite associated with Mimetite on
Pharmacosiderite3 photos of Legrandite associated with Pharmacosiderite on

Related Minerals - Nickel-Strunz GroupingHide

8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon.
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2OOrth. 2 2 2 : P21 21 21
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
8.DC.15ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon.
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon.
8.DC.15WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15Cobaltarthurite(Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15UKI-2006-(PO:FeHZn)ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15UKI-2006-(PO:AlCuFeH)Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
8.DC.20BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
8.DC.20CoralloiteMn2+Mn3+2(AsO4)2(OH)2 · 4H2OTric. 1 : P1
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon.
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.25MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.27BerauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric.
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric.
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric.
8.DC.30FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2OTric. 1 : P1
8.DC.32TinticiteFe3+5.34(PO4)3.62(VO4)0.38(OH)4 · 6.7H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24Al(PO4)17O6(OH)12 · 17H2OHex. 6/m : P63/m
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2OTric.
8.DC.50WavelliteAl3(PO4)2(OH,F)3 · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.50AllanpringiteFe3+3(PO4)2(OH)3 · 5H2OMon. 2/m : P21/m
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon.
8.DC.57OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2OOrth. mmm (2/m 2/m 2/m)
8.DC.60CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2OMon. 2/m : P21/b

Related Minerals - Dana Grouping (8th Ed.)Hide · 3H2OMon. 2/m : P2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.3.1AdamiteZn2(AsO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnnm
20.3.2ParadamiteZn2(AsO4)(OH)Tric. 1 : P1
20.3.3KoritnigiteZn(HAsO4) · H2OTric. 1 : P1
20.3.5WarikahniteZn3(AsO4)2 · 2H2OTric.
20.3.6KöttigiteZn3(AsO4)2 · 8H2OMon. 2/m : B2/m
20.3.7StranskiiteZn2Cu(AsO4)2Tric. 1 : P1
20.3.8Philipsburgite(Cu,Zn)6(AsO4,PO4)2(OH)6 · H2OMon.
20.3.9AustiniteCaZn(AsO4)(OH)Orth. 2 2 2 : P21 21 21
20.3.10ProsperiteCa2Zn4(AsO4)4 · H2OMon.
20.3.11GaititeCa2Zn(AsO4)2 · 2H2OTric.
20.3.12ZincroseliteCa2Zn(AsO4)2 · 2H2OMon.
20.3.13O'DanieliteNa(Zn,Mg)3H2(AsO4)3Mon. 2/m : B2/b
20.3.14JohilleriteNa(Mg,Zn)3Cu(AsO4)3Mon. 2/m : B2/b
20.3.15Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8Orth. mmm (2/m 2/m 2/m) : Ccca
20.3.16Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2OTric.
20.3.17Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
20.3.18LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
20.3.19Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)Tric. 1 : P1
20.3.20OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon.
20.3.21FahleiteCaZn5Fe3+2(AsO4)6 · 14H2OOrth.
20.3.22KeyiteCu2+3Zn4Cd2(AsO4)6 · 2H2OMon. 2/m

Fluorescence of LegranditeHide

No fluorescent in UV

Other InformationHide

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 LegranditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Drugman, J., and M. H. Hey (1932) Legrandite, a new zinc arsenate. Mineralogical Magazine 23: 175-718.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 958-959.
Desautels, P.E. and R.S. Clarke, Jr. (1963) Re-examination of legrandite. American Mineralogist: 48: 1255–1265.
McLean, W.J., J.W. Anthony, J.J. Finney, and Laughon, R.B. (1971) The crystal structure of legrandite. American Mineralogist (1971): 1147-1154.
Canadian Mineralogist (1982): 20: 88.
Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2000) Handbook of Mineralogy, Volume IV. Arsenates, Phosphates, Vanadates. Mineral Data Publishing, Tucson, AZ, 680pp.: 308.
Jinnouchi, S., Yoshiasa, A., Sugiyama, K., Shimura, R., Arima, H., Momma, K., Miyawaki, R. (2016): Crystal structure refinements of legrandite, adamite, and paradamite: The complex structure and characteristic hydrogen bonding network of legrandite. Journal of Mineralogical and Petrological Sciences: 111: 35-43; (2016)

Internet Links for LegranditeHide

Localities for LegranditeHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • New South Wales
    • Yancowinna Co.
      • Broken Hill district
No reference listed
  • Minas Gerais
    • Conselheiro Pena
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Canadian Mlneralogist Vol. 20, pp. 87-89 (1982)
  • Baden-Württemberg
    • Black Forest
      • Lahr
        • Reichenbach
Lapis, (4), 11-13.
  • Lower Saxony
    • Harz
      • Lautenthal
No reference listed
  • North Rhine-Westphalia
    • Siegerland
      • Wilnsdorf
Lapis, 12 (1), 11-18+42.
  • 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
Schnorrer-Köhler, G., Rewitzer, C., Standfuss, L. & Standfuss, K. (1988): Weitere Neufunde aus Lavrions antiken Schlacken. Lapis 13 (2), 11-14.
        • Sounion area
Laurion The minerals in the ancient slags by Piet Gelaude etc.
        • Thorikos area
Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
        • Vrissaki area
Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • Niimi City
          • Ohsa-osakabe
Kusachi et al (1986) Mineralogical Journal, 13, 141-150.
  • Kyushu Region
    • Miyazaki Prefecture
      • Takachiho
Ishibashi et al (1981) Chigaku Kenkyu, 32, 29-34.; Uehara, S., et al. (2014) Minerals from Kyushu and Yamaguchi. (Fukuoka Mineral Club, 355 pages)
Uehara, S., et al. (2014) Minerals from Kyushu and Yamaguchi. (Fukuoka Mineral Club, 355 pages)
  • Chihuahua
    • Mun. de Aquiles Serdán
      • Santa Eulalia District
        • West Camp
          • Francisco Portillo
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
  • Durango
    • Mun. de Mapimí
      • Mapimí
Rocks & Min.: 56:247.; Panczer (1987) Minerals of Mexico
Thomas P. Moore (2008) Lapis, 33, #7-8, 33-40.
  • Nuevo Leon
    • Mun. de Lampazos de Naranjo
      • Lampazos de Naranjo (Lampazos)
Mineralogical Magazine (1932): 23: 175-178; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 959; Panczner (1987): 102-339.
  • Oshikoto Region (Otjikoto Region)
    • Tsumeb
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Gebhard, G. (1999): Tsumeb II. A Unique Mineral Locality. GG Publishing, Grossenseifen, Germany
  • Lower Silesia (Dolnośląskie)
    • Rudawy Janowickie Mts
      • Jelenia Góra District
Ciesielczuk, J., Bzowski, Z. (2003): Secondary (Cu,Zn)-oxyminerals from the Miedzianka copper deposit in Rudawy Janowickie, Sudetes Mts. Preliminary Report. Mineralogia Special Papers: 23: 54-56
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
  • Mashonaland West
    • Kadoma District
Vetter, U., Weck, H.-D., Weale, T., Klosa, D., Wittich, C. and Hoffmann, K. (1999): A provisional inventory of the Sanyati oxide-zone minerals, Zimbabwe. Z. Angew. Geol. 45, 15-21.; Frei, Martina (2005) Composition, formation, and leaching behaviour of supergene, polymetallic ores from the Sanyati deposit (Zimbabwe): A case study
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