Figure 1: Photomicrographs showing the contrasting mode of occurrence of pyroxene in the entablature and colonnade of the Holyoke basalt. Figure 2: Analyses of pyroxene crystals in the Holyoke ...

the colonnade was still missing its second tier. Segments of the original marble from the frieze on the entablature -- now kept safe in warehouses or museums -- have been recreated in resin ...