THE MATERIAL LIBRARY
Magnesite
A magnesium carbonate mineral.
Colors & patterns
Usually white or cream, sometimes with brown veining; dyed colors are common.
Typical origins
Occurs in several countries; the exact origin of a cut cab needs supplier documentation.
Hardness
About 3.5–4.5
Choosing & setting this material
Often used as a turquoise imitation after dyeing. It is relatively soft and acid-sensitive; identify it accurately and favor protected jewelry.
Care & cleaning
Wipe gently with a soft, slightly damp cloth and dry promptly. Avoid soaking, acids, solvents, steam and ultrasonic cleaning. Store separately to protect the surface.
Origins above describe typical sources of the material, not the origin of an illustrated or stocked stone. Hardness measures scratch resistance, not resistance to breaking. Confirm the identity and treatments of the actual piece.
Further reading: Material reference · GIA: gem treatments