fluorite

"My doctor recommended I take a calcium supplement to strengthen my bones. "

"Example Sentence: "My dentist recommended toothpaste with fluoride to help strengthen my teeth and prevent cavities." "

"The liftoff will occur in exactly twelve seconds."

"The artist applied bright enamels to the copper bowl, creating a colorful design. "

"to fibreglass the hull of a fishing-boat"

"Humans and birds can perceive color."

"The new student was a natural from Japan. "

"The factory's efficient manufacture of toys allowed them to sell many at a low price. "

"The reasons are various."

"The new school policy was widely discussed by parents. "

"The geologist found a beautiful mineral specimen in the rock collection. "

"The school used its limited resources to provide extra tutoring sessions for struggling students. "