Ingredient dictionary

Calcium Carbonate

Also listed as: Chalk

Calcium Carbonate is a white mineral powder made of calcium, carbon and oxygen, mainly used to absorb oil and add a soft, matte look. It is on the label of 5 products in our library. Checked against our library November 6, 2026.

What Calcium Carbonate does

Makes products look whiter and more opaque
Absorbs excess oil and shine
Adds a gentle polishing grit to scrubs
Bulks up powder formulas

Calcium carbonate is one of the most common minerals on Earth. It is found in chalk, limestone, marble and seashells. For cosmetics, it is either ground from natural rock or made through a controlled chemical process, which gives a finer, more even powder.

Formulators like it because it is inexpensive, bright white and easy to blend. It soaks up oil without feeling heavy, and it helps powders look smooth and opaque. Larger, rougher grains can also work as a mild scrub. On skin it feels dry and powdery, and it is generally well tolerated.

Good for

Suits oily and combination skin wanting a matte finish, and people who like a soft, gentle polishing scrub.

Frequently asked questions

Is calcium carbonate safe for skin?

It is generally well tolerated and is used in many makeup and skincare products. Like any powder, it can feel drying on very dry skin, so notice how your own skin responds before using it often.

Is calcium carbonate the same as chalk?

In a sense, yes. Chalk is a soft form of calcium carbonate, so the two share the same basic chemistry. Cosmetic grades are refined specifically for use on skin, so they are not the same as classroom chalk.