Hydrotalcite

hydrotalcite

serpentine

magnesite

talc

Images

Formula: Mg6Al2(CO3)(OH)16(H2O)4
Hydrated carbonate containing hydroxyl, hydrotalcite group. The mineral originally named "manasseite" was considered to be a paramorph of hydrotalcite, but it has since been renamed as the polytype hydrotalcite-2H, and the name "manasseite" has been discredited.
Specific gravity: 2.03 to 2.09
Hardness: 2
Streak: White
Colour: White, brownish
Solubility: Soluble with effervescence in 1:10 hydrochloric acid
Environments

Metamorphic environments

Hydrotalcite occurs as a secondary mineral in serpentinite, associated with hydrotalcite-2H, serpentine and dolomite (HOM).

Localities

At the type locality, the Dypingdal serpentine-magnesite deposit, Snarum, Modum, Viken, Norway, hydrotalcite occurs as contorted, lamellar to fibrous white masses with waxy or pearly lustre in a serpentine-magnesite body associated with steatite and hydrotalcite-2H (Mindat).

At Bazhenovsk deposit, Asbest, Sverdlovsk Oblast, Russia, asbestos deposit hydrotalcite occurs with brucite, pyroaurite, antigorite and calcite (Dana).

At Antwerp and Oxbow, Jefferson county, New York, USA, hydrotalcite occurs in close association with hydrotalcite-2H (Dana).

Amity, Town of Warwick, Orange county, New York, USA, hydrotalcite occurs as an alteration product of spinel (Dana).

At Rossie, St. Lawrence county, New York, USA, hydrotalcite occurs in close association with hydrotalcite-2H (Dana).

At Somerville, St. Lawrence county, New York, USA, hydrotalcite occurs as an alteration product of spinel (Dana).

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