Hydrotalcite is a rare hydrated, magnesium, aluminum carbonate and this rich specimen is from the Type Locality - Snarum, Norway. Waxy, talc-like, grayish/whitish hydrotalcite is sculpturally embedded in a matrix of oxidized, yellow-green serpentine. Hydrotalcite is so named for its resemblance to talc. From an older museum collection dating to prior to WW I.