Which stone is less commonly used in interiors compared to others?

The choice of gold as a stone less commonly used in interiors compared to others is correct because gold is primarily a precious metal rather than a stone like the others listed. While gold can be incorporated into design as a decorative element, such as in finishes or fixtures, it is not typically used in the same way that slate, sandstone, or granite are employed for surfaces, flooring, countertops, or architectural features.

Slate, sandstone, and granite are all forms of stone that are durable and suitable for various interior applications. Slate is often used for flooring and roofing, while granite is a popular choice for countertops due to its strength and aesthetic appeal. Sandstone can be utilized for various surfaces as well, offering a warm appearance and unique texture. In contrast, the rarity, cost, and specific application of gold limit its practicality and commonality in interior design. This distinction underscores why gold stands out as the least commonly used stone in interior environments compared to the others mentioned.