He discovered the new minerals yttrialite and thorogummite (at Barringer Hill, Texas) and aguilarite (at Guanajuato, Mexico) and was the namesake for the mineral "nivenite"--now considered a variety of uraninite.
He spent time at the San Carlos silver mine in Guanajuato, acquiring many silver specimens including a new silver selenide which, at his recommendation, was later named aguilarite by Frederick Genth in honor of the mine's superintendant, J.
The principal minerals found are argentite, aguilarite
, naumanite, and guanajuatite, and it has been shown that contaminants such as arsenic, selenium, and antimony decrease with depth; thus minerals such as pyrargyrite and proustite also become rarer as mining goes deeper into the Earth.
Peter Megaw's case was enhanced by a choice aguilarite
, one of the really rare silver minerals.
35 and harmotome) (1997), 1571 Redefinitions Aguilarite
Pending Armalcolite Bowles: Am.
Almost randomly I'll select for individual raves Kerith Graeber's red grossular from Coahuila, her 4-cm kottingite spray from the Ojuela mine, and her matrix boleite with three 1.5-cm cubes; Peter Megaw's thumbnail of aguilarite
with stacked skeletal crystals, and his Guanajuato wire silver; Evan Jones' 6-cm Fresnillo pyrargyrite, his huge and brilliant and stibnite-mimicking Zacatecas jamesonite, and his unearthly-beautiful San Francisco mine wulfenite.