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. 2024 Jan 3;9(2):2547–2558. doi: 10.1021/acsomega.3c07305

Table 2. Lattice Parameters and Cell Volume of Orthorhombic Aragonite and Trigonal Calcite in the Precipitates from Ballygowan or Evian Hard Water; X-rays in Figure 5.

  pure aragonite pure calcite 40 min sonicated heated to 80 °Ca boiled
a (Å) 5.016 4.99 4.960 4.99 4.962
b (Å) 8.035   7.970   7.972
c (Å) 5.812 17.06 5.744 17.05 5.742
V (Å3) 234.2 367.9 227.1   225.7
a

21% pure calcite, the remaining 79% with 5% Mg substitution.