Vray+6+material+library -
Open Cosmos > Find "White Marble" > Drag the thumbnail from Cosmos directly onto your 3D object. V-Ray automatically creates a new material slot and assigns it.
In V-Ray 5, the Material Library was a separate downloadable executable. In V-Ray 6, it is fully integrated into Chaos Cosmos. This means: vray+6+material+library
This is where V-Ray 6 shines. You get brushed stainless steel, copper (oxidized and new), aluminum, and even "Car Paint" (Metallic flakes & clearcoat). Open Cosmos > Find "White Marble" > Drag
Standard float glass, frosted glass, ribbed glass, and patterned glass. Open Cosmos >