General Gaitite Information
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Chemical Formula: |
Ca2Zn(AsO4)2·2(H2O) |
Composition: |
Molecular Weight = 459.41 gm |
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Calcium 17.45 % Ca 24.41 % CaO |
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Zinc 14.23 % Zn 17.72 % ZnO |
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Arsenic 32.62 % As 50.03 % As2O5 |
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Hydrogen 0.88 % H 7.84 % H2O |
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Oxygen 34.83 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Ca2Zn(AsO4)2·2(H2O) |
Environment: |
Secondary arsenate mineral. |
IMA Status: |
Approved IMA 1980 |
Locality: |
Tsumeb mine, Tsumeb, Namibia. Link to MinDat.org Location Data. |
Name Origin: |
Named for Rober Irwin Gait (1938-), curator of mineralogy, Royal Ontario Museum, Toronto, Canada. |
Synonym: |
IMA1978-047 |
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Gaitite Image |
Images:
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Gaitite Crystallography
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Axial Ratios: |
a:b:c =0.8453:1:0.8247 |
Cell Dimensions: |
a = 5.899, b = 6.978, c = 5.755, Z = 1; alpha = 94.41°, beta = 109.08°, gamma = 108.09° V = 212.18 Den(Calc)= 3.60 |
Crystal System: |
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1 |
X Ray Diffraction: |
By Intensity(I/Io): 2.781(1), 3.08(0.8), 2.75(0.7), |
Crystal Structure:
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Keller P , Lissner F , Schleid T , European Journal of Mineralogy , 16 (2004) p.353-359, The crystal structures of zincroselite and gaitite: Two natural, polymorphs of Ca2Zn[AsO4]2·2H2O from Tsumeb, Namibia, Note: c cell edge corrected by authors, Locality: Tsumeb, Namibia
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Physical Properties of Gaitite
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Cleavage: |
[010] Good, [001] Good, [011] Good |
Color: |
Colorless, White. |
Density: |
3.81 |
Diaphaniety: |
Transparent |
Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Habit: |
Spherical - Spherical, rounded aggregates. |
Hardness: |
5 - Apatite |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Gaitite
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Gladstone-Dale: |
CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.085 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2029,KPDmeas= 0.1917,KC= 0.187 |
Optical Data: |
Biaxial (+), a=1.713, b=1.73, g=1.748, bire=0.0350, 2V(Calc)=90, 2V(Meas)=88. |
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Calculated Properties of Gaitite
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Electron Density: |
relectron=3.65 gm/cc note: rGaitite =3.81 gm/cc. |
Fermion Index |
Fermion Index = 0.00623 Boson Index = 0.99377 |
Photoelectric: |
PEGaitite = 31.40 barns/electron U=PEGaitite x relectron= 114.59 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Gaitite is Not Radioactive |
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Gaitite Classification
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Dana Class: |
40.2.2.6 (40)Hydrated Phosphates, etc |
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(40.2)where A++ (B++)2 (XO4) · x(H2O) |
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(40.2.2)Fairfieldite Subgroup (Triclinic: P1¯) |
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40.2.2.1 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1 |
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40.2.2.2 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1 |
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40.2.2.3 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1 |
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40.2.2.4 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1 |
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40.2.2.5 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1 |
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40.2.2.6 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1 |
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40.2.2.7 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri |
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40.2.2.8 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri |
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40.2.2.9 Hillite! Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1 |
Strunz Class: |
VII/C.17-60 VII - Phosphates, Arsenates and Vanadates |
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VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+ |
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VII/C.17 - Collinsite - Wendwilsonite series |
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VII/C.17-10 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1 |
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VII/C.17-15 Hillite! Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1 |
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VII/C.17-20 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1 |
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VII/C.17-30 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1 |
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VII/C.17-40 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1 |
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VII/C.17-50 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1 |
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VII/C.17-60 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1 |
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VII/C.17-70 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri |
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VII/C.17-80 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri |
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VII/C.17-90 Wendwilsonite Ca2(Mg,Co)(AsO4)2·2(H2O) P 21/c 2/m |
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VII/C.17-100 Roselite Ca2(Co,Mg)(AsO4)2·2(H2O) P 21/c 2/m |
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VII/C.17-110 Brandtite Ca2(Mn,Mg)(AsO4)2·2(H2O) P 21/c 2/m |
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VII/C.17-120 Zincroselite Ca2Zn(AsO4)2·2(H2O) P 21/c 2/m |
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Other Gaitite Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin 90:522) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Gaitite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (UofA)
7 -MinDAT
8 -MinMax(Deutsch)
9 -MinMax(English)
10 -Mineralienatlas (Deutsch)
11 -QUT Mineral Atlas
12 -École des Mines de Paris
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Print or Cut-and-Paste your Gaitite Specimen Label here :
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Gaitite
Ca2Zn(AsO4)2·2(H2O)
Dana No: 40.2.2.6 Strunz No: VII/C.17-60
Locality:
Notes:
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