Table 6 The chemistry and crystal structure data of hydrous andradite from pyroclastic rocks of Siera De Bahoruco compared with literature data of other garnet species worldwide.

Hydrous garnet from Dominican Republic – this study

[Ca_2.98Na_0.02K_0.01Fe²⁺_0.01][Fe³⁺_1.25Al_0.45Ti_0.15Fe²⁺_0.07Mg_0.04V³⁺_0.01Mn²⁺_0.01] Si_2.43 O_9.72(OH)_2.28

Space Group: Ia-3d

Cell a: 12.172(5)

Hydrogrosular (Hibschite)

Crestmore, USA

(ICDD no 75-169)⁴⁸

Ca_3.0Al_2.0(SiO₄)_1.53(OH)_5.88

Space Group: Ia-3d

Cell a: 12.174

Morimotoite

Fuca. Ocayama. Japan.

(ICDD no 47-1877)⁴⁷

Ca_3.0TiFeSi_3.0O_12.0

Space Group: Ia-3d

Cell a: 12.162(3)

Schörlomite

San Benito, Ca, USA.

(ICDD no 33-0285)

(Krabbenhoft and McCarthy 1980)

Ca_3.0 (Ti, Fe)_2.0[(Si, Ti)O_4.0]_3.0

Space Group: Ia-3d

Cell a: 12.128

Hydrous Andradite

South Africa

(ICDD no 87-1971)⁴⁹

Ca_3.0Fe_1.54Mn_0.2 Al_0.26(SiO₄)_1.65(OH)_5.40

Space Group: Ia-3d

Cell a: 12.340(1)

Andradite

San Benito, Ca, USA

(ICDD no 84-2015)⁴

Ca_3.0 Fe_1.6 Al_0.4(SiO₄)_2.58(OH)_1.68

Space Group: Ia-3d

Cell. a: 12.105(3)