A(n) is an assemblage of minerals bound together, a mass composed of a single mineral, a mass of undifferentiated materials, or a mass of solid organic material.

Rock

Explanation:

Rock -

It refers to the naturally occuring mass of mineral , with a uniform chemical composition , is referred to as a rock .

In the crust of the Earth , the composition is by the igneous rocks .

There are three main type of rocks , i.e. ,

Hence , from the given information of the question ,

The correct term is rock.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3