Dolomite
Form of rock
>
&h=2272&w=1704&tbnid=mL-ihT2gnbKbKM&q=Dolomite+(rock)&tbnh=259&tbnw=194&usg=AI4_-kRYGq23qWFuGrSS8XERxMgkpzaKSQ&vet=1&docid=fnjLwKgRzJvQMM&itg=1&sa=X&ved=2ahUKEwiqw8ifst2FAxUxHzQIHRjKC5oQ9QF6BAgAEAQ)
&tbnh=113&tbnw=150&usg=AI4_-kRLcVKT-kyWW_55MWT6q-8lGVOc1w&vet=1&docid=RzwK-0U2CFoBqM&sa=X&ved=2ahUKEwiqw8ifst2FAxUxHzQIHRjKC5oQ9QF6BAgAEAY)
&tbnh=92&tbnw=123&usg=AI4_-kTql2GZUBUhZL2h1BauMHXfGfBjvQ&vet=1&docid=CDXXDB9GJeDknM&sa=X&ved=2ahUKEwiqw8ifst2FAxUxHzQIHRjKC5oQ9QF6BAgAEAg)
&tbnh=95&tbnw=143&usg=AI4_-kSqzXsRwFfzS2-MlmmPDEeHDl7FjQ&vet=1&docid=_gxRXNP3XtIjdM&sa=X&ved=2ahUKEwiqw8ifst2FAxUxHzQIHRjKC5oQ9QF6BAgAEAo)
Dolomite is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite, CaMg(CO₃)₂. It occurs widely, often in association with limestone and evaporites, though it is less abundant than limestone and rare in Cenozoic rock... Wikipedia