Stones of Canada Ep 4: Limestone’s of Canada

Venu Gopal

Sedimentary rock - Limestone  Limestone is a SEDIMENTARY ROCK largely or wholly composed of calcium carbonate (CaCO3). Carbonate rocks, and in some cases marble, the metamorphosed near-equivalent of limestone, are important to the construction industry as building stone and aggregate, and as the primary component of Portland CEMENT and lime....

Episode 3: Canadian Granite

Venu Gopal

Igneous Rocks Granite Unlike limestone, granite was slow to appear on the architectural stone market. It was not until railway construction began in the mid-19th century that industrial production of granite began. Before that time, known deposits were considered to be too far from the Montréal and Québec consumer areas....

Stones of Canada, Episode:2

Venu Gopal

Sandstones Sandstone is a sedimentary rock mostly composed of more or less rounded quartz grains, 1/16 mm to 2 mm in diameter, cemented by iron oxides, clay, calcite, or silica. Sandstone is whitish, light grey, or variously colored depending on the pigments in the binder. Since the mid-1960s, most of...

Stones of South Africa-Part 2

Sammy Chris

PRECIOUS GEMSTONES OF AFRICA  Most gemstones are minerals or rocks and occur in favored sites in the earth’s crust or in the gravels that result from the weathering of rocks. Of the beautifully crystallized minerals that seem useful for gems, only a very few meet the standards and are sufficiently...