a very hard, granular, crystalline, igneous rock, formed at great depths and pressures, consisting mainly of quartz, mica, and feldspar and often used as a building stone.
« Back to Glossary Indexa very hard, granular, crystalline, igneous rock, formed at great depths and pressures, consisting mainly of quartz, mica, and feldspar and often used as a building stone.
« Back to Glossary IndexPublished on
by
We use essential cookies to ensure the site functions properly. We also use optional cookies to improve your experience.
You can see our cookie policy for more information and manage your preferences.