What type of rocks include slate, soapstone, marble, or serpentine?

The group of rocks that includes slate, soapstone, marble, and serpentine is categorized as metamorphic rocks. Metamorphic rocks are formed from the alteration of existing rock types through heat, pressure, and chemically active fluids. This process, known as metamorphism, transforms the original rock, often changing its mineral composition and texture.

Slate, for instance, originates from shale and is characterized by its fine-grained texture and ability to cleave into sheets. Soapstone is formed mainly from talc and exhibits a soft texture, making it valuable for carving and as a heat-resistant material. Marble, a metamorphosed form of limestone, features a crystalline structure and is commonly used in sculpture and architecture. Serpentine, which forms from the hydration of certain ultramafic rocks, is recognized for its greenish color and is often used as a decorative stone.

Each of these rocks demonstrates the effects of metamorphism, which is central to their formation and distinct characteristics, confirming their classification as metamorphic rocks.