* Interlocking grains: This indicates the rock has been subjected to heat and pressure, causing the mineral grains to recrystallize and grow together.
* No specific pattern: This eliminates foliated metamorphic rocks, which exhibit a layered or banded appearance due to the alignment of minerals under pressure.
* Granoblastic: This term describes metamorphic rocks with a granular texture, where the grains are roughly equidimensional and interlock without any specific arrangement.
Examples of granoblastic metamorphic rocks include:
* Marble: Formed from limestone or dolostone under heat and pressure.
* Quartzite: Formed from sandstone under heat and pressure.
* Hornfels: A fine-grained, non-foliated metamorphic rock that forms when rocks are baked by contact with magma.
Note: While granoblastic rocks are the most likely answer, it's important to consider other factors like the specific mineral composition and texture to accurately identify the rock.
