Adolarius Jacob Forster (1739-1806) was a Prussian mineralogist and dealer indisplay specimen minerals.The Forster family Yorkshire in 1649 and settled in Prussia. Adolarius Jacob Forster began dealing in mineral specimens around 1766, at the age of 27. He continued in that profession for 40 years and travelled widely. He had premises in London, Paris and St. Petersburg.The Covent Garden, London shop and one in Soho was run by his wife. His brother, Ingham Henry Forster (1725-1782) ran the business in Paris.Auction catalogues for sales in Paris were written by Rome de l'Isle.