International Journal of Mineralogy

Research Article

First Report of Florencite from the Singhbhum Shear Zone of the East Indian Craton

Table 1

Representative analyses of florencite, lazulite, augelite, kyanite, and rutile mineral from studied area. Florencite mineral composition has been compared with compositions from different localities.
ElementsLocation
Florencite (calculated on 11 oxygen basis. Values in wt%)Florencite data by Nagy et al. 2002 [6] (values in wt%)Florencite data by Janots et al. 2006 [8] (values in wt%)Florencite data by Doroshkevich et al. 2009 [19] (values in wt%)Lazulite (values in wt%)Augelite (values in wt%)Kyanite (values in wt%)Rutile (values in wt%)
Singhbhum shear zone (SSZ)Sopron Hills, Eastern Alps, HungarySebtide complex, Rif, MoroccoAmba-Dongar, Gujarat, IndiaSinghbhum shear zone (SSZ)
SiO20.00 0.06 0.01 n.a. 0.24–4.2 >0.75 0.01 0.23 36.69 0.00
TiO20.07 0.00 0.04 n.a. n.a. n.a. 0.03 0.06 0.02 100.90
Al2O328.47 27.37 27.28 28.66–31.89 27.10–31.92 27.86–30.67 33.49 49.30 62.45 0.06
Cr2O30.00 0.00 0.00 n.a. n.a. n.a. 0.00 0.08 0.04 0.13
FeO 0.00 0.01 0.00 n.a. 0.17–1.4 n.a. 0.00 0.00 0.03 0.10
MnO 0.00 0.00 0.00 n.a. n.a. n.a. 0.43 0.04 0.02 0.00
CaO 0.42 0.64 0.54 0.72–1.44 0.42–0.69 0.23–0.81 0.01 0.00 0.00 0.01
MgO 0.01 0.05 0.10 n.a. 0.02–0.70 n.a. 13.32 0.03 0.01 0.00
Na2O 0.09 0.09 0.11 n.a. 0.01–0.06 n.a. 0.03 0.00 0.06 0.00
K2O 0.00 0.00 0.01 n.a. n.a. n.a. 0.00 0.00 0.02 0.01
P2O530.81 30.72 30.84 26.97–28.93 22.4–26.4 26.08–28.56 48.44 37.09 0.00 0.00
ZrO20.00 0.00 0.00 n.a. n.a. n.a. ————
Nb2O50.00 0.00 0.04 n.a. n.a. n.a. ————
La2O36.83 7.69 7.12 6.46–8.66 4.22–4.25 3.91–12.64 ————
Ce2O3 10.93 12.15 11.78 10.91–14.33 8.37–9.26 4.94–12.32 ————
PbO 0.00 0.00 0.00 n.a. n.a. n.a. ————
ThO20.49 1.18 1.18 0.55–9.94 0.59–1.09 n.a. ————
U2O30.04 0.02 0.02 n.a. 0.07–0.17 n.a. ————
BaO 0.00 0.00 0.00 n.a. n.a. n.a. ————
SrO 0.12 0.15 0.10 0.16–0.67 1.32–5.91 4.47–13.36 ————
Nd2O32.70 2.61 2.69 1.65–5.00 3.96–4.80 1.02–2.91 ————
Sm2O31.10 1.06 1.09 0.10–0.92 0.55–0.60 n.a. ————
SO30.00 0.00 0.00 n.a. 0.21–0.59 1.08–4.71 ————
Total 82.08 83.81 82.95 87.69–90.36 78.21–86.35 71.40–78.98 95.76 86.83 99.40 101.25
 a.p.f.u. a.p.f.u. a.p.f.u. a.p.f.u. a.p.f.u. a.p.f.u. a.p.f.u. a.p.f.u. a.p.f.u. a.p.f.u.
Si 0.00 0.01 0.00 n.a. 0.020–0.379 0.060–0.170 0.00 0.02 1.00 0.00
Ti 0.00 0.00 0.00 n.a. n.a. n.a. 0.00 0.00 0.00 1.00
Al 2.99 2.90 2.89 3.203–3.360 2.880–3.131 2.710–2.950 1.95 3.84 2.00 0.00
Cr 0.00 0.00 0.00 n.a. n.a. n.a. 0.01 0.00 0.00 0.00
Fe 0.00 0.00 0.00 n.a. 0.012–0.107 0.020–0.333 0.02 0.00 0.00 0.00
Mn 0.00 0.00 0.00 n.a. n.a. n.a. 0.00 0.00 0.00 0.00
Ca 0.04 0.06 0.05 0.068–0.105 0.038–0.067 0.020–0.070 0.00 0.00 0.00 0.00
Mg 0.00 0.01 0.01 n.a. 0.003–0.095 n.a. 0.98 0.00 0.00 0.00
Na 0.02 0.02 0.02 n.a. 0.002–0.012 n.a. 0.00 0.00 0.00 0.00
K 0.00 0.00 0.00 n.a. n.a. n.a. 0.00 0.00 0.00 0.00
P 2.33 2.34 2.35 2.041–2.117 1.710–1.863 1.770–2.001 2.03 2.08 0.00 0.00
Zr 0.00 0.00 0.00 n.a. n.a. n.a. ————
Nb 0.00 0.00 0.00 n.a. n.a. n.a. ————
La 0.11 0.13 0.12 0.104–0.106 0.131–0.140 0.110–0.340 ————
Ce 0.18 0.20 0.19 0.204–0.213 0.277–0.282 0.140–0.392 ————
Pb 0.00 0.00 0.00 n.a. n.a. n.a. ————
Th 0.01 0.02 0.02 n.a. 0.022–0.011 n.a. ————
U 0.00 0.00 0.00 n.a. 0.001–0.004 n.a. ————
Ba 0.00 0.00 0.00 n.a. n.a. n.a. ————
Sr 0.01 0.01 0.01 0.011–0.035 n.a. n.a. ————
Nd 0.09 0.08 0.09 0.142–0.156 0.128–0.143 0.030–0.071 ————
Sm 0.03 0.03 0.03 0.023–0.027 0.018–0.019 n.a. ————
S b.d.l. b.d.l. b.d.l. n.a. 0.069–0.285 0.070–0.273 ————
Total cation 5.80 5.80 5.79 5.892–5.992 5.763–5.945 5.637–5.834 4.98 5.95 3.00 1.00
REE0.42 0.45 0.44 0.484–0.537 0.603–0.612 0.300–0.603     
Florencite (mol%) 89.94 86.69 88.45        
Goyazite (mol%) 1.36 1.47 1.03        
Crandallite (mol%) 8.70 11.84 10.52        
Note n.a.: not available, b.d.l.: below detection limit.