I On the Moon, could you melt dirt by focussing sunlight?

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Focusing sunlight on the Moon using a large metal parabolic reflector could potentially melt lunar dirt into bricks and paths. The vacuum of the Moon would minimize heat loss, enhancing the melting process. Sunlight on the Moon, while similar to that on Earth, has slightly more UV and infrared due to the lack of atmosphere. Using a tungsten mold to shape the melted dirt into bricks is feasible, although the mold would be single-use due to the material sticking after solidification. This method presents a practical approach to utilizing lunar resources for construction.
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On the Moon, could you melt dirt into bricks and paths by focussing sunlight?
If you had a large metal parabolic reflector and just pointed it at the ground, would it melt the dirt? Could you make a path that way? In the vacuum there would be less escape of heat to cool it.
If you piled dust into a tungsten mould could you melt it into bricks?
 
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Sunlight on the Moon is the same as sunlight on Earth (a bit more UV and a bit more infrared as no atmosphere filters it). You can melt things with it, sure.
The tungsten mold would be single-use because the brick sticks to it after getting solid.
 

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