From sedimentary rocks:
* Hornfels: A very hard, fine-grained rock formed from shale or mudstone. It often has a dark color and may contain minerals like cordierite, andalusite, or sillimanite.
* Marble: Formed from limestone or dolostone, it is composed primarily of calcite or dolomite. Marble is often used in construction and sculpture due to its beauty and durability.
* Quartzite: Formed from sandstone, quartzite is a very hard and resistant rock composed primarily of quartz. It often has a glassy texture and may be used in building materials or as a source of silica.
From igneous rocks:
* Skarn: A complex rock formed when hot fluids from an intrusion react with existing carbonate rocks (limestone or dolostone). Skarns can contain a variety of minerals, including garnet, pyroxene, and epidote, and are often important sources of valuable ores.
* Migmatite: A mixed rock type where igneous and metamorphic features are intermixed. It forms when pre-existing metamorphic rocks are partially melted by the heat from an intrusion.
Other possibilities:
* Eclogite: A high-pressure metamorphic rock formed at depths greater than 15 km. While not strictly a contact metamorphic rock, it can form in the aureole of deep-seated intrusions.
It's important to remember that the specific rock type formed will be influenced by factors such as:
* Composition of the original rock: The starting material will determine the mineral content of the metamorphic rock.
* Temperature and pressure: Higher temperatures and pressures will result in more significant changes in the rock.
* Time: The longer the rock is subjected to metamorphic conditions, the more significant the changes will be.
So, while there are common examples, the exact rock type formed in a contact metamorphic zone is quite diverse and depends on the specific conditions of the environment.
