How do I identify Alum-(na)?

Alum-(na) can be identified by its hardness of 3 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.

What color is Alum-(na)?

Alum-(na) typically appears in Colourless. Color can vary depending on impurities and formation conditions.

How hard is Alum-(na)?

Alum-(na) has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.

Alum-(na)

Alum-(Na)

A variety of Minerals

What is Alum-(na)?

Sodium aluminium sulfate is the inorganic compound with the chemical formula NaAl(SO4)2·12H2O (sometimes written Na2SO4·Al2(SO4)3·24H2O). Also known as soda alum, sodium alum, or SAS, this white solid is used in the manufacture of baking powder and as a food additive.

Alum-(na) Market Value Calculator

Estimate the market value of Alum-(na) using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Alum-(na) Localities Map

See where Alum-(na) 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

Characteristics of Alum-(na)

Like its potassium analog, sodium aluminum sulfate crystallizes as the dodecahydrate in the classical cubic alum structure. Sodium alum is very soluble in water, and is extremely difficult to purify. In the preparation of this salt, it is preferable to mix the component solutions in the cold, and to evaporate them at a temperature not exceeding 60 °C. 100 parts of water dissolve 110 parts of sodium alum at 0 °C, and 51 parts at 16 °C.