Gneiss- Hard course grained metamorphic rock, not easily worked. It is also called a kind of granite, composed of mica, quartz, and schist, with additional iron, magnesium and silicates. Footing- Foundation; A…
Gneiss- Hard course grained metamorphic rock, not easily worked. It is also called a kind of granite, composed of mica, quartz, and schist, with additional iron, magnesium and silicates. Footing- Foundation; A…