Mackayite - Sold
- Mohawk mine (McGinnity shaft)
- Esmeralda County
- 2.9 by 2.5 by 1.6 cm – Thumbnail specimen (fits into a 3 cm cube)
Mackayite is an iron tellurate originally found at Goldfield, Nevada. Frondel and Pough (1944) named the mineral in honor of John William Mackay (1831-1902), mining business magnate at the Comstock Lode, who endowed the Mackay School of Mines at University of Nevada at Reno. Mackayite forms yellow green pseudo-octahedral crystals to 0.5 mm in a cavity in altered volcanic matrix. The mineral is tetragonal (pseudocubic). This specimen was part of the personal collection of Ralph Merrill, proprietor of the prolific mail order business Minerals Unlimited. Ralph Merrill obtained this specimen from John 'Jack' Parnau.