These brick-shaped building blocks are known as Copperhouse slag or scoria blocks. This is a typical example. They were cast from the residue of the copper smelting works that operated at ...

The large cylindrical pukaos are made of red volcanic rock called scoria, while the Moai heads are carved from volcanic tuff. The materials were excavated from craters at opposites sides of the ...

Cohens troubled hedge fund, will join Scoria Capital Partners where he will focus on industrial stocks. Orenstein starts trading at Scoria, which is based in Greenwich, Conn., on January 5. The fund ...