Stone: The role of petrography in the selection of sandstone for repair

Petrography identifies the minerals and the texture of a rock and can be specially tailored toward those features, which are important to dimension sandstone. A number of petrographic factors can be identified which affect the durability and performance of dimension sandstone.

Date
1 April 2000
Publisher
Heritage Office
Type
Heritage publications, Maintenance series, Publication
Status
Final
Cost
Free
Language
English
Tags
  • ISBN 1-87641-5452
  • File PDF 65KB
  • Pages 16
  • Name the-role-of-petrography-in-the-selection-of-sandstone-for-repair.pdf

Many of the heritage buildings in the Sydney area are composed, either wholly or in part, of local sandstone. On the basis of broad composition, colour and colour change, dimension sandstone can be classified into six groups. However, most Sydney sandstone buildings are composed of either/or both of (a) 'yellow block' sandstone and (b) quartz-rich sandstone.

The well-known Sydney 'yellow block' sandstone is a true dimension stone, which is grey when quarried, but oxidises and darkens on exposure to the atmosphere to a warm yellow-brown colour. Quartz-rich sandstone is white, grey or pale yellow in colour when freshly quarried and does not darken or change colour significantly on exposure to the atmosphere.