Hydrotalcite
A variety of Minerals
What is Hydrotalcite?
Hydrotalcite is a layered double hydroxide (LDH) of general formula Mg6Al2CO3(OH)16·4H2O, whose name is derived from its resemblance with talc and its high water content. The layers of the structure stack in multiple ways, to produce a 3-layer rhombohedral structure (3R Polytype), or a 2-layer hexagonal structure (2H polytype) formerly known as manasseite. The two polytypes are often intergrown. The carbonate anions that lie between the structural layers are weakly bound, so hydrotalcite has anion exchange capabilities. It was first described in 1842 for an occurrence in a serpentine - magnesite deposit in Snarum, Modum, Buskerud, Norway. It occurs as an alteration mineral in serpentinite in association with serpentine, dolomite and hematite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Hydrotalcite 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.
Hydrotalcite Localities Map
See where Hydrotalcite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- White, brownish
- Hardness (Mohs)
- 2
- Density
- 2 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Mg6Al2(CO3)(OH)16 · 4H2O
- Elements
- Al, C, H, Mg, O
Also Known As
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Hydrotalcite FAQs
How do I identify Hydrotalcite?
Hydrotalcite can be identified by its hardness of 2 on the Mohs scale, White color. Look for these key characteristics when examining specimens.
What color is Hydrotalcite?
Hydrotalcite typically appears in White, brownish. Color can vary depending on impurities and formation conditions.
How hard is Hydrotalcite?
Hydrotalcite has a hardness of 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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