Conservators had noticed that some paintings using crocoite
have become discolored, but researchers hadn't pinned down the cause.
Lead phases detected in lead paint include synthetic hydrocerussite, crocoite
, anglesite, phoenicochroite and possible plattnerite.
against a black background, is a kingly crocoite
specimen; on the back cover we make the pictorial acquaintance of bismuthinite, cassiterite, fluorite and siderite from little-known Tasmanian places.
But more along our lines were dozens of giant, superlative crocoites
from Tasmania put in by Olivier Szentessy, Saint-Jean de Tholome, and the current Adelaide mine proprietor, Adam Wright.
And, in your darkest moments, perhaps you wonder what would happen if those friendly TSA folks accidentally gouged a hole smack in the middle of your prized crocoite
has been identified as "yellow, waxy patches in microcrystalline intergrowths of dawsonite and "K-feldspar" which also contain pyrochlore, pseudorutile and siderite" (Sabina, 1979).
There were Cornish and Russian specimens aplenty: chalcophyllite, torbernite, liroconite crystals to 1 cm, chalcocite crystals to 2 cm, olivenite, copper, crocoite
, cerussite, feldspar crystals, etc.
Durable specimens may resist careless handling, earthquakes and other hazards; it is well to keep this in mind when making your selections for a display collection, even though vulnerable specimens of crocoite
, mesolite or others may be appealing.
The locality is a deserted old prospect called the Chapacase mine, in the Antofagasta region, where Terry gophered into a small hole to follow the mineralized milky quartz vein until he found small pockets containing druses of very bright red wulfenite crystals, with individuals to 5 mm; in general aspect the specimens resemble Russian crocoite
Pete Bancroft's case was loaded with great pieces, including the famous Alma rhodochrosite, a fine California gold, a big Brazilian rose quartz crystal cluster from the Sapucaia mine and a superb Australian crocoite
, to name just a few.
The most colorful specimen displayed was a brilliant and exceedingly delicate, almost foot-wide plate of crocoite
from Dundas, Tasmania.
Unfortunately, much of what had been found in the past carried a stubborn coating of cream-colored gibbsite which detracted from the fiery orange-red crocoite
and made specimens virtually valueless.