1) Halide mineral 2) Lead mineral
Found on
https://www.crosswordclues.com/clue/barstowite
Barstowite, formula Pb4[Cl6|CO3]•H2O, is a transparent to white mineral in the monoclinic system. It has a Mohs hardness of 3, a white streak and an adamantine lustre. The type locality for Barstowite is Bounds Cliff, St Endellion, Cornwall in the United Kingdom. It is named after Richard W. Barstow (1947–1982) a Cornish mineral collector. ......
Found on
http://en.wikipedia.org/wiki/Barstowite
No exact match found.
