Why San Giacomo Granite is Yellow?

Why San Giacomo Granite is Yellow?

Sardinian granites fall into the color categories of gray, pink, white and yellow, with the first two predominating; their design is of a homogeneous type, meaning by this term a uniform distribution of the crystals at each observation scale, which means that the aspect observed on a reduced scale, such as a hand sample or a tile, is representative of the appearance that the material assumes on a larger scale, such as that of a slab or an entire floor.

Yellow granites such as San Giacomo offer a medium and medium-small grain product characterized by a variable shade from pale yellow to intense yellow.
The main feature of the granite from the Deiana graniti quarry is precisely the color, a more or less intense yellow given by the high presence of iron.