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Gaitite

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Formula:
Ca2Zn(AsO4)2 · 2H2O
System:
Triclinic
Hardness:
5
Name:
Named in 1980 by Bozidar Darko Sturman and Pete J. Dunn in honor of Robert Irwin Gait [b. September 12, 1938], mineralogist, Curator of the mineral and gem collection (1967-1996), Royal Ontario Museum, Toronto, Ontario, for his contributions to mineralogy and curatorial excellence.

Classification of Gaitite

Approved 1978
8.CG.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
40.2.2.6

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
20.3.11

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 Gaitite

Year of Discovery:
1978

Physical Properties of Gaitite

Hardness (Mohs):
5

Crystallography of Gaitite

Crystal System:
Triclinic
Cell Parameters:
a = 5.9Å, b = 7.61Å, c = 5.57Å
α = 111.67°, β = 70.83°, γ = 119.42°
Ratio:
a:b:c = 0.775 : 1 : 0.732

Optical Data of Gaitite

Type:
Biaxial (+)
RI values:
nα = 1.713 nβ = 1.730 nγ = 1.748
2V:
Measured: 88° , Calculated: 90°
Max Birefringence:
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak

Chemical Properties of Gaitite

Formula:
Ca2Zn(AsO4)2 · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Gaitite to other Species

Series:
Forms a series with Talmessite (see here)
Other Members of Group:
CassidyiteCa2(Ni2+,Mg)(PO4)2 · 2H2O
CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2O
FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2O
MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2O
NickeltalmessiteCa2Ni(AsO4)2 · 2H2O
ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
TalmessiteCa2Mg(AsO4)2 · 2H2O
Unnamed (Fe2+-analogue of Parabrandtite)Ca2Fe2+(AsO4)2 · 2H2O
β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
8.CG.05CassidyiteCa2(Ni2+,Mg)(PO4)2 · 2H2O
8.CG.05CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2O
8.CG.05FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2O
8.CG.05MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2O
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2O
8.CG.05HilliteCa2(Zn,Mg)(PO4)2 · 2 H2O
8.CG.10BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
8.CG.10RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
8.CG.10WendwilsoniteCa2Mg(AsO4)2 · 2H2O
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2O
8.CG.10RruffiteCa2Cu(AsO4)2 · 2H2O
8.CG.15FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
8.CG.15MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15MounanaitePbFe23+(VO4)2(OH,F)2
8.CG.15ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.15TsumcoritePb(Zn,Fe3+)2(AsO4)2 · 2(H2O,OH)
8.CG.15CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15CabalzariteCa(Mg,Al,Fe3+)2(AsO4)2(OH,H2O)2
8.CG.15Krettnichite(Pb,Sr)(Mn3+,Co)2(VO4)2 · 2(OH,H2O)
8.CG.15CobalttsumcoritePb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15NickellotharmeyeriteCa(Ni,Fe3+,Co)2(AsO4)2 · 2(H2O,OH)
8.CG.15ManganlotharmeyeriteCa(Mn3+,Zn)2(AsO4)2(OH,H2O)2
8.CG.15Schneebergite(Bi3+,Ca)(Co,Ni,Fe3+)2(AsO4)2(OH,H2O)2
8.CG.15Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)
8.CG.20GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.20HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
8.CG.20ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)
8.CG.20RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2O
8.CG.20PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)
8.CG.20LukrahniteCa(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)
8.CG.25PottsiteHPbBi(VO4)2 · 2H2O
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2O
20.3.1AdamiteZn2(AsO4)(OH)
20.3.2ParadamiteZn2(AsO4)(OH)
20.3.3KoritnigiteZn(HAsO4) · H2O
20.3.4LegranditeZn2(AsO4)(OH) · 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)
20.3.12ZincroseliteCa2Zn(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 Gaitite

Name in Other Languages:
German:Gaitit
Russian:Гаитит
Spanish:Gaitita

Other Information

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 Gaitite

Reference List:
STURMAN, B.D. & DUNN, P.J. (1980): Gaitite, H2Ca2Zn(AsO4)2(OH)2, a new mineral from Tsumeb, Namibia. Canadian Mineralogist 18, 197-200.
KELLER, P., HESS, H. & RIFFEL, H. (1981) Die Krystallstruktur von zwei neuen Calcium-Zink-Arsenat-mineralien von Tsumeb/Namibia. Zeitschrift für Krystallographie und Mineralogie 156, 70-71 (in German).

Internet Links for Gaitite

Localities for Gaitite

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
 
  • Rhineland-Palatinate
    • Lahn valley
      • Bad Ems District
        • Frücht
Schnorrer, G., (1993): Mineralogische Notitzen VI, Der Aufschluss, Vol. 44, 44-58
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
Namibia
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
STURMAN, B.D. & DUNN, P.J. (1980): Gaitite, H2Ca2Zn(AsO4)2(OH)2, a new mineral from Tsumeb, Namibia. Canadian Mineralogist 18, 197-200. KELLER, P., HESS, H. & RIFFEL, H. (1981) Die Krystallstruktur von zwei neuen Calcium-Zink-Arsenat-mineralien von Tsumeb/Namibia. Zeitschrift für Krystallographie und Mineralogie 156, 70-71 (in German).
USA
 
  • Nevada
    • Humboldt Co.
      • Osgood Mts
        • Potosi District
NBMG Spec. Pub. 31 Minerals of Nevada
      • Potosi District
        • Twin Creeks Mine
Min News (1999) 15:6 pp 1,5-8
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