icon duct or ▁of ▁interest ▁as ▁a ▁blue - green ▁em itter , ▁a ▁property ▁that ▁has ▁been ▁known ▁since ▁the ▁early ▁ 1 9 0 0 s . ▁The ▁wide - band ▁gap ▁property ▁also ▁allows ▁the ▁use ▁of ▁M g S ▁as ▁photo - det ector ▁for ▁short ▁w avel ength ▁ult rav io let ▁light . ▁ ▁Occ urrence ▁As ide ▁from ▁being ▁a ▁component ▁of ▁some ▁sl ags , ▁M g S ▁is ▁a ▁rare ▁non ter rest rial ▁min eral ▁n ining er ite ▁detected ▁in ▁some ▁meteor ites . ▁ ▁M g S ▁is ▁also ▁found ▁in ▁the ▁circum stell ar ▁en velop es ▁of ▁certain ▁evol ved ▁carbon ▁stars , ▁i . ▁e ., ▁those ▁with ▁C / O ▁ ▁> ▁ 1 . ▁ ▁Saf ety ▁M g S ▁evol ves ▁hydro gen ▁sul f ide ▁upon ▁contact ▁with ▁mo ist ure . ▁ ▁References ▁ ▁Category : S ulf ides ▁Category : M agn es ium ▁comp ounds ▁Category : II - VI ▁sem icon duct ors <0x0A> </s> ▁The ▁Cl erm ont ▁chain ▁of ▁la kes ▁is ▁a ▁chain ▁of ▁la kes ▁centered ▁on ▁Cl erm ont , ▁Florida . ▁The ▁chain ▁is ▁orient ated ▁from ▁sout heast ▁to ▁north west ▁and ▁fed ▁primarily ▁by ▁streams ▁and ▁ground water ▁flow . ▁They ▁make ▁up ▁the ▁middle ▁part ▁of ▁the ▁Pal at lak aha ▁River ▁waters hed ▁which ▁forms ▁the ▁head w aters ▁of ▁the ▁O ck law aha ▁River . ▁The ▁la kes