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Table 4 Results of PCA, showing contribution of PC1–4 to overall variability, and contribution of individual variables to each PC

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

Variable PC1 (46%) PC2 (21%) PC3 (11%) PC4 (10%)
Quartz 9.9 23.4 4.7 3.1
Opal CT 5.8 1 33.6 28.
Calcite 14.5 6.5 14.1 4.9
Clays 2.2 33 7.2 1.7
Bulk density 7.1 2.7 25.6 23
Open porosity 7.2 16 5.8 0.9
Pulse velocity 24.5 1.4 0 5.6
Capillary absorption 19.4 2.4 2.3 7.3
Sorptivity 9.4 13.7 6.7 25.1