1) Calcium mineral 2) Halide mineral
Found on
https://www.crosswordclues.com/clue/hilgardite
Hilgardite is a borate mineral with the chemical formula Ca2B5O9Cl·H2O. It is transparent and has vitreous luster. It is colorless to light pink with a white streak. It is rated 5 on the Mohs Scale. It crystallizes in the triclinic crystal system. Crystals occur as distorted tabular triangles and are hemimorphic, polytypes exist. It was named for...
Found on
http://en.wikipedia.org/wiki/Hilgardite
No exact match found.
