Pseudomorphs

Reinvestigation of dioptase-plancheite pseudomorphs after calcite from the Tantara copper deposit Katanga, Republique du Congo. ❋ Unknown (2006)

Being less hydrated than malachite it is itself liable to alteration into this mineral, and pseudomorphs of malachite after azurite are not uncommon. ❋ Various (N/A)

At Monteponi the crystals encrust cavities in glistening granular galena; and from Leadhills, in Scotland, pseudomorphs of anglesite after galena are known. ❋ Various (N/A)

I conceive it as a mechanism set going by heat -- as a sort of active crystal with the capacity of giving rise to a great number of pseudomorphs; and I conceive that external conditions favour one or the other pseudomorph, but leave the fundamental mechanism untouched. ❋ Thomas Henry Huxley (1860)

The majority of the sauropod elements were encased in an iron-oxide crust which preserve evidence of pyritic pseudomorphs; some iron-oxide crusts were up to 10 cm thick. ❋ Scott A. Hocknull Et Al. (2009)

It is found that in some cases, the matrix of a certain shaped crystal may, after the crystal is dissolved or taken away, become filled by some other and foreign substance, perhaps in liquid form; or a crystalline substance may become coated or "invested" by another foreign substance, which thus takes its shape; or actual chemical change takes place by means of an incoming substance which slowly alters the original substance, so that eventually each is false and both become pseudomorphs. ❋ John Mastin (N/A)

"barleycorn" pseudomorphs of calcium carbonate after celestite from ❋ Various (N/A)