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.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Alum-(na) before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
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.
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.
Quick Facts
Physical Properties
- Color
- Colourless
- Hardness (Mohs)
- 3
- Density
- 1.67 g/cm³
Chemical Properties
- Chemical Formula
- NaAl(SO4)2 · 12H2O
- Elements
- Al, H, Na, O, S
Also Known As
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Alum-(na) FAQs
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.
What is the characteristics of alum-(na) 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.
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