India, Australia & Colorado, USA
Sandstone is a sedimentary rock composed of sand-sized grains (0.0625–2mm) — primarily quartz, but also feldspar and lithic fragments — cemented together by silica, calcite, or iron oxide. The cement type determines color and durability: silica-cemented sandstone is the hardest; iron oxide-cemented sandstone shows warm...
Good freeze-thaw resistance in dense grades. Specify low-absorption (≤1.5%) sandstone for freeze zones. Indian sandstone performs well in the moderate-freeze Northeast when sealed. Higher-porosity grades are best limited to zones 7–11.
Seal with penetrating sealer every 12 months for outdoor use — sandstone's higher porosity (2–3%) makes sealing more important than for denser stones. Clean with pH-neutral stone cleaner. Remove moss and algae with algaecide rated for natural stone; rinse thoroughly. In staining-prone environments, impregnating sealer prevents deep oil staining.
Sandstone is harder (Mohs 6–7 vs limestone's 3–4) but more porous. For exterior paving: sandstone's hardness resists surface wear better; limestone's lower porosity means better freeze-thaw performance in dense grades. Sandstone offers warmer, earthier tones; limestone tends toward cooler grays and buffs. For landscaping with rustic character, sandstone is often preferred; for formal architectural paving, limestone is the more common specification.
Dense Indian sandstone (absorption ≤1.5%) can be used in Canadian climates when properly sealed. Kandla Grey and Autumn Brown in calibrated format with annual sealing perform well in Ontario and BC. Avoid higher-porosity grades in Quebec, Manitoba, or Alberta where freeze-thaw is extreme. Specify sealer re-application in spring after freeze-thaw season.
Sandstone is a sedimentary rock composed of sand-sized grains (0.0625–2mm) — primarily quartz, but also feldspar and lithic fragments — cemented together by silica, calcite, or iron oxide. The cement type determines color and durability: silica-cemented sandstone is the hardest; iron oxide-cemented sandstone shows warm red/rust tones. Sandstone grades from Mohs 6–7 depending on quartz content and cementation. India is the world's largest sandstone exporter — Kandla Grey, Mint, Raj Green, and Fossil Mint are the dominant North American imports. Colorado Lyons sandstone (red) and Pennsylvania bluestone-related varieties are significant domestic sources.