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Heritage Science
Fig. 9 | Heritage Science

Fig. 9

From: The many faces of Reigate Stone: an assessment of variability in historic masonry based on Medieval London’s principal freestone

Fig. 9

Biplot of Principal Component Analysis showing variation of samples according to dimensionality of two principal components and contribution of variables to the components. PC1 groups calcite with density and strength characteristics; PC2 groups clay content with sorptivity. The distribution of individuals shows that there is no clear typological clustering, although there is some grouping according to quarry provenance (e.g. GO1–3) and TOL is a notable outlier. Removing TOL does not significantly alter the dimensionality

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