What makes sunscreen ‘reef safe’?

Reef-safe sunscreens usually use mineral-based ingredients, such as zinc oxide and titanium dioxide, instead of chemical sunscreens. These minerals work by reflecting the UV rays away from the skin, rather than being absorbed into the skin like chemical sunscreens.
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Stream2Sea's answer to What makes sunscreen ‘reef safe’? - Quora

Stream2Sea's answer: Sunscreen is considered "reef safe" when it does not contain chemicals that are harmful to coral reefs and other marine life. Some common sunscreen ingredients such as oxybenzone, octinoxate, and octocrylene have b