How do I identify Hydromagnesite?

Hydromagnesite can be identified by its hardness of 3.5 on the Mohs scale, Colourless to white color, Pearly, Vitreous, Silky, Dull luster, Monoclinic crystal system. Look for these key characteristics when examining specimens.

What color is Hydromagnesite?

Hydromagnesite typically appears in Colourless to white, colourless in transmitted light. Color can vary depending on impurities and formation conditions.

How hard is Hydromagnesite?

Hydromagnesite has a hardness of 3.5 on the Mohs scale. This gives it moderate hardness.

Hydromagnesite

A variety of Minerals

Rare

Hydromagnesite specimen - rock identification

What is Hydromagnesite?

Hydromagnesite is formed when certain magnesium-containing minerals are weathered down. The mineral not particularly common, and it's most often found in caves, so most people don't have much direct contact with it. Because it gives off water and carbon dioxide when it decomposes, hydromagnesite is used in flame retardants.

Uses & Applications

Hydromagnesite is commonly used in industry for its fire retardant properties, and it is incorporated into many plastic products as a fire proofing agent. Research is currently ongoing to determine if hydromagnesite would also be a good flame retardant in electric devices.

Hydromagnesite Market Value Calculator

Estimate the market value of Hydromagnesite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Hydromagnesite Localities Map

See where Hydromagnesite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview

North ZoneCentral RidgeSouth Basin

Key Characteristics

Composition of Hydromagnesite

Hydromagnesite thermally decomposes in three stages releasing water and carbon dioxide. The first stage starting at about 220 °C, is the release of the four molecules of water of crystallisation. This is followed at about 330 °C by the decomposition of the hydroxide ion to a further molecule of water. Finally, at about 350 °C carbon dioxide begins to be released. The release of the carbon dioxide can be further broken down into two stages depending on the rate of heating.