Metalloids are all solid at room temperature. Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semi-conductors. Silicon for example appears lustrous, but is not malleable or ductile (it is brittle - a characteristic of some nonmetals).
The answer is Metalloids can be opaque as well as nonmetals.
Explanation:
Nonmetals are very different from metals, their surface is opaque, and they are bad conductors of heat and electricity, besides they are low density, and melt at low temperatures. The shape of nonmetals cannot be easily altered, as they tend to be fragile and brittle. On the other hand, metalloids are the group of elements that have the properties of metals and nonmetals, these can be both bright and opaque, and their shape can easily change, the metalloids are conductors of heat and electricity, better way that nonmetals but not as good as metals.
