Porphyry, any igneous rock consisting of large crystals in a mass of much smaller crystals. The large and small crystals usually are of different minerals; the rock is generally named according to its major component (for example: granite porphyry). When cut and polished, porphyry has a beautiful pattern and contrast of colors. It is used for tombstones and ornamental panels.
Most of us think of scientific names as the nonsense we scan right over when reading textbooks. But you're missing out on a world of fun if you're ignoring italics. Take this quiz to discover some truly entertaining scientific names.
The man who had some theories about relativity was also an eccentric who gleefully eschewed socks, dodged German military service and spurned social conventions.