But, notwithstanding the beauty and rarity of the many discoveries he made elsewhere, Wright's finest hour as a collector-dealer was his discovery in 1851 of phosgenite and of the new mineral matlockite in the Bage mine at Cromford in Derbyshire.
Greg also had the mineral analyzed, and published it shortly after as matlockite.
According to Greg (1851) the type matlockite was found on "the old heaps of the level mine at Cromford, near Matlock.
The Bage mine phosgenite and matlockite specimens were very highly valued by Wright.
Fine examples of cerussite, dioptase, malachite, azurite, wulfenite, smithsonite and vanadinite have been collected there, as well as some of the finest known examples of a number of rarer species such as boleite, diaboleite, caledonite, hydrocerussite, linarite, matlockite
Kunz, "unusually strong in the rare and expensive minerals such as wulfenite, crocoite, matlockite
, vanadinite, and all the metallic minerals.
These biggies included matlockite
, greenockite, harmotome, susannite, and others from Scottish localities.
In the European cases a pale yellow 2-cm crystal aggregate (on matrix) of matlockite
from Cromford, Derbyshire, England, caught my eye.
1992) Notes on the history of phosgenite and matlockite
from Matlock, England.