Home > Laskowski Ⅸ – October 7 > MS1971 Berthierine


Berthierine is an iron aluminosilicate, specifically a member of the kaolinite-serpentine group. In other words, berthierine is a clay mineral and as is typical of the group, rarely forms free-standing crystals. Beudant (1832) named the mineral after French geologist, Pierre Berthier (1782-1861), who first discovered the species. Mont St.-Hilaire is the best of species occurrence for berthierine.

Berthierine forms pseudo-hexagonal tablets to 1 mm with a gray green color. Good for the species! Also present on this specimen are annite, pectolite, and albite. From the collection of E.R. Laskowski (1949-2020), a mining engineer who retired to Tucson, Arizona.

Price: $75

Item code: MS1971

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