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Annex IV Entry 139 14/08/2020

Magnesium carbonate

CI 77713

Magnesium carbonate appears in Annex IV as a positive-list colorant entry for EU cosmetics.

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Permitted colorant— Annex IV, EU Regulation 1223/2009
Entry: 139

Chemical identity and properties

PubChem 2D chemical structure for CAS 546-93-0
CAS 546-93-0CAS 7757-69-9PubChem CID 11029

Magnesium Carbonate

Magnesium carbonate is a magnesium salt with formula CMgO3. Its hydrated forms, particularly the di-, tri-, and tetrahydrates occur as minerals. It has a role as a fertilizer and an antacid. It is an organic magnesium salt, a magnesium salt, a carbonate salt and a one-carbon compound. — ChEBI

IUPAC name
magnesium carbonate
Molecular formula
CMgO3
Molecular weight
84.31 g/mol
Exact mass
83.9697855 Da
Topological polar surface area
63.2 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
3
Covalent units
2
Defined stereocentres
0

Also known as

MagnesiteMagnesium carbonate anhydrousKimboshiMagmasterApoldaDestabMagfyCarbonate magnesium
16 more reported names
Carbonic acid, magnesium salt (1:1)Magnesium carbonate (1:1)GP 20 (carbonate)MA 70 (carbonate)DCI light magnesium carbonateGold Star (carbonate)C.I. 77713Stan-mag magnesium carbonateMagnesium carbonate (MgCO3)Ins no.504(i)Anhydrous magnesium carbonateIns-504(i)Magnesium carbonate gold starCI 77713Light magnesium carbonateMagnesium (as carbonate)
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Record details

Colour index or glossary

CI 77713

Chemical name

Magnesium carbonate

Chemical / IUPAC name

Magnesium carbonate

Color

White

Regulatory information

Regulation

(EC) 2009/1223

See every entry this act set

Identified ingredients

Key data

CAS
546-93-0; 7757-69-9
EC
208-915-9; 231-817-2
Annex
IV
Entry number
139

Inventory links for Magnesium carbonate

Inventory Restriction reference
Ref 32833

CI 77713

CAS: 546-93-0 / 7757-69-9
EC: 208-915-9 / 231-817-2

Direct matches are limited for this record, so nearby entries from Annex IV are shown as well.

Annex IV 138
Nearby record in the same annex

CI 77510

CAS: 25869-00-5
EC: 237-875-5
Annex IV 140
Nearby record in the same annex

CI 77742

CAS: 10101-66-3
EC: 233-257-4
Annex IV 137
Nearby record in the same annex

CI 77499

CAS: 12227-89-3; 1309-37-1; 1317-61-9; 1345-25-1; 1345-27-3; 52357-70-7
EC: 235-442-9; 215-168-2; 215-277-5; 215-721-8; 215-722-3; 257-870-1
Annex IV 141
Nearby record in the same annex

CI 77745

CAS: 10124-54-6
EC: 233-341-0
Annex IV 136
Nearby record in the same annex

CI 77492

CAS: 51274-00-1
EC: 257-098-5
Annex IV 142
Nearby record in the same annex

CI 77820

CAS: 7440-22-4
EC: 231-131-3
Annex IV 135
Nearby record in the same annex

CI 77491

CAS: 1345-25-1; 1345-27-3; 1309-37-1; 1317-61-9; 52357-70-7
EC: -; 215-722-3; 215-168-2; -; 257-870-1
Annex IV 134
Nearby record in the same annex

CI 77489

CAS: 1345-25-1
EC: 215-721-8
Annex IV 144
Nearby record in the same annex

ZINC OXIDE

CAS: 1314-13-2
EC: 215-222-5
Annex IV 133
Nearby record in the same annex

CI 77480

CAS: 7440-57-5
EC: 231-165-9

What Annex IV means for Magnesium carbonate

Magnesium carbonate is an approved colorant listed in Annex IV of EU Cosmetics Regulation 1223/2009. Only colorants on this positive list may be used to colour cosmetic products on the EU market.

Some colorants in Annex IV are restricted by product type — for example, prohibited from use around the eyes or in products applied to mucous membranes. Check the product type and conditions fields above before use.

This record is linked to 2 CosIng inventory ingredients for name and identifier cross-reference. The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Confirm colorant is used only in permitted product types listed above.
  • Record the Colour Index number and CAS identifier in the ingredient declaration.

Frequently asked questions

Yes. Magnesium carbonate is included in Annex IV of EU Cosmetics Regulation 1223/2009 as a permitted colorant. Only colorants on this positive list may be used to colour cosmetic products in the EU. Check the product type conditions above for any use restrictions.

CAS 546-93-0; 7757-69-9 is the unique numerical identifier assigned to Magnesium carbonate by the Chemical Abstracts Service. In cosmetic compliance work, the CAS number is used to cross-reference the substance across regulatory databases, raw material specifications and safety assessment reports. Multiple EU annex entries may share the same CAS number if the same substance appears under different conditions or in different annexes.

Use the INCI Checker tool on this site to paste your full ingredient list (INCI) and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records. This is useful for rapid compliance screening of finished product formulas or raw material declarations.
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Source note for Annex IV record Magnesium carbonate

This page summarizes one Annex IV record for Magnesium carbonate from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex IV conditions for Magnesium carbonate, but confirm any final regulatory decision against the current official annex wording and source files.

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