Home > Lead Minerals – December 31 > MS1147 Macquartite

Macquartite - Sold

Macquartite is a copper lead chromate silicate mineral. Williams & Duggan (1980) named the species in honor of French chemist Louis Charles Henri Macquart (1745-1808), who brought some Russian crocoite to France, in which the element chromium was first discovered. Curiously, macquartite is yellow, rather than green or blue typical of oxidized copper minerals. Apparently the coloring effect of chromate trumps that of copper!

This specimen is a slim fragment of quartz, with one edge covered in dioptase and willemite microcrystals and scattered wulfenite blades. The macquartite forms yellow needles enclosed in the quartz matrix just underlying the other secondary minerals.

This specimen was part of the personal collection of Ralph Merrill, proprietor of the prolific mail order business Minerals Unlimited. Merrill obtained this piece from Sid Williams, and it carries a "Globo de Plomo" label. Merrill's collection card and label also ship with the specimen.