Malachite to Cuprite – Chessy lesmines, Rhone, France
 A beautifully formed pseudomorph of malachite after cuprite with skeletal surfaces. Crystals from the classic Chessy locality in France are extremely rare and sought after, as no new material is being mined.
 These crystals are mostly converted into copper carbonates.
 Some of it, however, is only superficial. In other parts, malachite contains a small, unaltered core of cuprite. And finally, there is also malachite entirely
 transformed pseudomorphs.
 The malachite that forms these pseudomorphs is never needle-like. It has a more porcelain-like appearance.
 The most common habitus is the octahedron, sometimes with indentation of the surface
 skeletal in shape.
 However, the rhombic dodecahedron can also be found with completely smooth surfaces.
 Some rhombic dodecahedral crystals are elongated along a threefold axis and form
 so pseudotrigonal crystals.
 Today, pseudomorphs of malachite to cuprite are hardly found in Chessy, but rather
 can be found in old collections.