Formula: Mg6Fe3+(CO3)(OH)13.4H2O
Hydrated carbonate containing hydroxyl, hydrotalcite group
Specific gravity: 2.14
Hardness: 2
Streak: White
Colour: Pink to yellowish or brownish white

Metamorphic environments
Hydrothermal environments

Brugnatellite occurs as a hydrothermal alteration product lining cracks in serpentinite, and associated with chrysotile, artinite, hydromagnesite, pyroaurite, magnesite, brucite and aragonite (HOM).


At the type locality, the Crestùn asbestos mine, Ciappanico, Torre di Santa Maria, Sondrio Province, Lombardy, Italy, brugnatellite occurs as crusts and coatings along cracks in serpentinite associated with artinite, hydromagnesite, pyroaurite, magnesite, chrysotile, aragonite and brucite (Dana).

At Monte Ramazzo, Liguria, brugnatellite occurs as an alteration product of brucite (Dana).

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