Table 1: (a) Elemental compositions of calcium carbonate nanocrystals and (b) elemental compositions of cockle shell powder.
(a)

SpectrumCarbonOxygenSodiumCalciumTotal (%)

Spectrum 120.1859.510.5319.78100.00
Spectrum 214.4446.730.3038.53100.00
Spectrum 313.5728.140.1858.11100.00
Mean16.0644.790.3438.81100.00
Standard deviation3.5915.780.1719.17
Max.20.1859.510.5358.11
Min.12.6528.140.1819.78

(b)

SpectrumCarbonOxygenSodiumCalciumAluminiumTotal (%)

Spectrum 122.1850.510.5327.600.17100.00
Spectrum 212.4446.320.3030.530.41100.00
Spectrum 313.5737.140.1858.11100.00
Mean16.0644.790.3438.81100.00
Standard deviation3.5915.780.1719.17
Max.19.8269.520.3658.11
Min.13.5726.420.1623.87