This is just pure physics awesomeness.  And do not try this at home without the supervision of a professional:

Using a rock as film to capture a temporary image of the sun 0:36. Backyard Lava Homemade Obsidian Rock conversion and How the sun can vaporize aluminum with a Professional grade Fresnel Lens. Forming borosilicate glass tubing. At 0:36 the image of the sun is exposed into the rock surface.
The maximum working temperature of plaster is 1,200 °C (2,200 °F), so higher melting temperature materials would melt the plaster mold. Also, the sulfur in the gypsum reacts with iron, making it unsuitable for casting ferrous materials.

Let’s watch this guy melt stuff in the video on page 2

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