Question

Which type of rock would chemically weather more rapidly marble or gneiss and why

Answer 1

sedimentary rocks
Gneiss is formed by high temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Orthogneiss is gneiss derived from igneous rock (such as granite). Paragneiss is gneiss derived from sedimentary rock (such as sandstone).

Answer 2

The answer Varies

Step-by-step explanation:

If you look at the Mohs hardness scale that could also help you & the rocks composition.

marble is less porous and slightly stronger than limestone, but still less durable than granite. (Google)

Take comfort in knowing that gneiss can withstand heavy use; it is made up of minerals in the 6-7 range on Mohs scale, meaning it's harder than glass and about the same hardness as steel.(Google)

Hardness: Being composed of calcite, marble has a hardness of three on the Mohs hardness scale. As a result, marble is easy to carve, and that makes it useful for producing sculptures and ornamental objects. The translucence of marble makes it especially attractive for many types of sculptures. (Google)