1) Lead mineral 2) Orthorhombic mineral
Found on
https://www.crosswordclues.com/clue/madocite
Madocite is a mineral with a general formula of Pb17(Sb,As)16S41. Madocite was named for the locality of discovery, Madoc, Ontario, Canada. It is found in the marbles of the Precambrian Grenville Limestone. It is orthorhombic (rectangular prism with a rectangular base) and in the point group mm2. Its crystals are elongated and striated along [001]...
Found on
http://en.wikipedia.org/wiki/Madocite
No exact match found.
