Metamorphic rocks that consist of only one mineral that forms large interlocking crystals often have

The answer is nonfoliated texture.

Nonfoliated metamorphic rocks are composed of one mineral, for example quartzite and marble. They don't have have wavy or platy structures and their texture is nonfoliated.

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem