How is spotted rock formed?

How is spotted rock formed?

Hornfels is a metamorphic rock formed by the contact between mudstone / shale, or other clay-rich rock, and a hot igneous body, and represents a heat-altered equivalent of the original rock. This process is termed contact metamorphism.

Which is an example of metamorphic rocks?

Common metamorphic rocks include phyllite, schist, gneiss, quartzite and marble. Foliated Metamorphic Rocks: Some kinds of metamorphic rocks — granite gneiss and biotite schist are two examples — are strongly banded or foliated.

Is andalusite a garnet?

The 18th-Century Gemstone Andalusite Garnet is an Inexperienced Gemstone that occurs in earthy or fall colors set as orange-yellow, brown, green and gold. This is the Beautiful Gemstone with a rare play of color, where the color switch as two or Three Times as it is turned.

Is sillimanite a rock or a mineral?

sillimanite, also called Fibrolite, brown, pale green, or white glassy silicate mineral that often occurs in long, slender, needlelike crystals frequently found in fibrous aggregates. An aluminum silicate, Al2OSiO4, it occurs in high-temperature regionally metamorphosed clay-rich rocks (e.g., schists and gneisses).

What is a spotted rock?

Spotted rock is a metamorphic rock which is fine grained with poor foliation, it has dark spots that are the result of low intensity contact metamorphism causing porphyroblasts to begin developing.

Where are sedimentary rocks found?

You’re most likely to find sedimentary rocks near sources of water, which is where a lot of erosion takes place. You can find different types in riverbeds, ponds and coasts and throughout the oceans.

Is slate a metamorphic rock?

slate, fine-grained, clayey metamorphic rock that cleaves, or splits, readily into thin slabs having great tensile strength and durability; some other rocks that occur in thin beds are improperly called slate because they can be used for roofing and similar purposes.

Is Obsidian a metamorphic rock?

Obsidian rocks are igneous rocks that form when lava cools quickly above ground. Obsidian is actually glass and not a mixture of minerals….Types of Rock.