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Legrandite

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Formula:
Zn2(AsO4)(OH) · H2O
System:
Monoclinic
Colour:
Yellow to colourless; ...
Lustre:
Vitreous, Sub-Vitreous, Resinous, Waxy
Hardness:
Name:
Named in 1932 by Julien Drugman and Max H. Hey in honor of Mr. LeGrand [ - 1920s?], a Belgium mining engineer and mineral collector who collected the first specimens.
A secondary mineral occurring in the oxidized zones of arsenic- and zinc-bearing deposits.

Visit gemdat.org for gemological information about Legrandite.

Classification of Legrandite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
8.DC.10

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
42.6.4.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq·xH2O
20.3.4

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

Year of Discovery:
1932
Geological Setting of First Recorded Material:
Oxidized zone of an arsenic-bearing zinc deposit.
Associated Minerals at First Recorded Locality:

Occurrences of Legrandite

Geological Setting:
Rare secondary mineral in Zn-As bearing deposits, granite pegmatites (rare).

Physical Properties of Legrandite

Vitreous, Sub-Vitreous, Resinous, Waxy
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Yellow to colourless; pale yellow to colourless in transmitted light.
Streak:
White
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Fair to poor on {100}
Fracture:
Irregular/Uneven
Density:
3.98 - 4.01 g/cm3 (Measured)    4.015 g/cm3 (Calculated)

Crystallography of Legrandite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group Setting:
P21/c
Cell Parameters:
a = 12.805(2) Å, b = 7.933(1) Å, c = 10.215(2) Å
β = 104.23°
Ratio:
a:b:c = 1.614 : 1 : 1.288
Unit Cell Volume:
V 1,005.82 ų (Calculated from Unit Cell)
Z:
8
Morphology:
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 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
12.36 (35)
6.68 (71)
5.93 (71)
4.19 (50)
4.08 (100)
3.08 (71)
3.03 (35)

Optical Data of Legrandite

Type:
Biaxial (+)
RI values:
nα = 1.675 - 1.702 nβ = 1.690 - 1.709 nγ = 1.735 - 1.740
2V:
Measured: 50° , Calculated: 52° to 62°
Birefringence:
0.66
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r < v strong
Optical Extinction:
X = b; Z ^ c = 40°
Pleochroism:
Visible
Comments:
X = Y = Colourless to yellow
Z = Yellow

Chemical Properties of Legrandite

Formula:
Zn2(AsO4)(OH) · H2O
Essential elements:
All elements listed in formula:

Relationship of Legrandite to other Species

8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2O
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2O
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2O
8.DC.15ArthuriteCuFe23+(AsO4)2(OH)2 · 4H2O
8.DC.15EarlshannoniteMn2+Fe23+(PO4)2(OH)2 · 4H2O
8.DC.15OjuelaiteZnFe23+(AsO4)2(OH)2 · 4H2O
8.DC.15WhitmoreiteFe2+Fe23+(PO4)2(OH)2 · 4H2O
8.DC.15Cobaltarthurite(Co,Mg)Fe23+(AsO4)2(OH)2 · 4H2O
8.DC.15BendadaiteFe2+Fe23+(AsO4)2(OH)2 · 4H2O
8.DC.15KunatiteCuFe23+(PO4)2(OH)2 · 4H2O
8.DC.15UKI-2006-(PO:FeHZn)ZnFe23+(PO4)2(OH)2 · 4H2O
8.DC.15UKI-2006-(PO:AlCuFeH)Fe2+Al3(PO4)2(OH)2 · 4H2O
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2O
8.DC.20BermaniteMn2+Mn23+(PO4)2(OH)2 · 4H2O
8.DC.20CoralloiteMn2+Mn23+(AsO4)2(OH)2 · 4H2O
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2O
8.DC.25FerristrunziteFe3+Fe23+(PO4)2(OH)3 · 5H2O
8.DC.25FerrostrunziteFe2+Fe23+(PO4)2(OH)2 · 6H2O
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
8.DC.25MetavivianiteFe2+Fe23+(PO4)2(OH)2 · 6H2O
8.DC.25StrunziteMn2+Fe23+(PO4)2(OH)2 · 6H2O
8.DC.27BerauniteFe2+Fe53+(PO4)4(OH)5 · 6H2O
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2O
8.DC.30LaueiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2O
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
8.DC.30PseudolaueiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2O
8.DC.30StewartiteMn2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30UshkoviteMgFe23+(PO4)2(OH)2 · 8H2O
8.DC.30FerrolaueiteFe2+Fe23+(PO4)2(OH)2 · 8H2O
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2O
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2O
8.DC.32TinticiteFe3+5.34(PO4)3.62(VO4)0.38(OH)4 · 6.7H2O
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2O
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2O
8.DC.40CacoxeniteFe243+Al(PO4)17O6(OH)12 · 17H2O
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2O
8.DC.50WavelliteAl3(PO4)2(OH,F)3 · 5H2O
8.DC.50AllanpringiteFe33+(PO4)2(OH)3 · 5H2O
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2O
8.DC.55MapimiteZn2Fe33+(AsO4)3(OH)4 · 10H2O
8.DC.57OgdensburgiteCa2Fe43+(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2O
8.DC.60Cloncurryite(Cu,VO)Al2(PO4)2(F,OH)2 · 4.5-5H2O
20.3.1AdamiteZn2(AsO4)(OH)
20.3.2ParadamiteZn2(AsO4)(OH)
20.3.3KoritnigiteZn(HAsO4) · H2O
20.3.5WarikahniteZn3(AsO4)2 · 2H2O
20.3.6KöttigiteZn3(AsO4)2 · 8H2O
20.3.7StranskiiteZn2Cu(AsO4)2
20.3.8Philipsburgite(Cu,Zn)6(AsO4,PO4)2(OH)6 · H2O
20.3.9AustiniteCaZn(AsO4)(OH)
20.3.10ProsperiteCaZn2(AsO4)(HAsO4)(OH)
20.3.11GaititeCa2Zn(AsO4)2 · 2H2O
20.3.12ZincroseliteCa2Zn(AsO4)2 · 2H2O
20.3.13O'DanieliteNa(Zn,Mg)3H2(AsO4)3
20.3.14JohilleriteNa(Mg,Zn)3Cu(AsO4)3
20.3.15Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8
20.3.16Chudobaite(Mg,Zn)5(AsO4)2(HAsO4)2 · 10H2O
20.3.17Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6
20.3.18LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
20.3.19Metaköttigite(Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH)
20.3.20OjuelaiteZnFe23+(AsO4)2(OH)2 · 4H2O
20.3.21FahleiteZn5CaFe2(AsO4)6 · 14H2O
20.3.22KeyiteCu32+Zn4Cd2(AsO4)6 · 2H2O

Other Names for Legrandite

Name in Other Languages:
German:Legrandit
Italian:Legrandite
Simplified Chinese:水羟砷锌石
Spanish:Legrandita

Other Information

No fluorescent in UV
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 Legrandite

Reference List:
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.

Internet Links for Legrandite

Specimens:
The following Legrandite specimens are currently listed for sale on minfind.com.

Localities for Legrandite

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.
Australia
 
  • New South Wales
    • Yancowinna Co.
No reference listed
Brazil
 
  • Minas Gerais
    • Doce valley
      • Conselheiro Pena
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Canadian Mlneralogist Vol. 20, pp. 87-89 (1982)
Germany
 
  • 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.
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
Schnorrer-Köhler, G., Rewitzer, C., Standfuss, L. & Standfuss, K. (1988): Weitere Neufunde aus Lavrions antiken Schlacken. Lapis 13 (2), 11-14.
        • 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
Japan
 
  • 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)
Mexico
 
  • 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.
Namibia
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Gebhard, G. (1999): Tsumeb II. A Unique Mineral Locality. GG Publishing, Grossenseifen, Germany
USA
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
Dunn(1995):Pt5:671.
Zimbabwe
 
  • 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.
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