Question: What elements were discovered by an English chemist and physicist who has a alcium inosilicate mineral that may contain small amounts of iron, magnesium, and manganese substituting for calcium named after him?
Sentence (from "Babingtonite"): It is a very dark green to black translucent (in thin crystals or splinters) mineral crystallizing in the triclinic system with typically radial short prismatic clusters and druzy coatings.
Relevant evidence: No