(Born: 1713; Died: 1795) German mineral dealer.

German mineral dealer of Leipzig. His collection was sold in 1792.

Biographical references: Poggendorff: 1, col. 869?. • Wilson, W.E., "Johann Georg Lenz and his Mustertafeln 1794", Mineralogical Record, 27, (1996), no. 3, 191-5, portrait, biblio: 172.

1. German, 1792 [Collection catalog].
Verzeichniss der Geisslerischen Mineralien-Sammlung zu Leipzig. Leipzig, 1792.

2 parts and supplements. [Part 1: 1792] 8°: 368 p.; [Part 2: 1792] 8°: 336 p.; [Supp. 1: 1796] 8°: 16 p.; [Supp. 2: 1798] 8°: 32 p.; [Supp. 3: 1799] 8°: 22 p.

Very rare. Collection and sale catalogs of an early Leipzig mineral dealer by the name of Geissler. He wrote these works in order to descibe his collection which was apparently also for sale.

Bibliographical references: Allgemeine Literatur-Zeitung: 1795, no. 4, 3. • BL [972.e.25.]. • Freiesleben, Sächsische Mineralien-Verzeichnisse, 1828: no. 52. • Gatterer, Mineralogischen Literatur, 1798-9: 1, 269. • GV (1700-1910): 151, 193. • Wilson, History of Mineral Collecting, 1994: 212.

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