Pyrite from Navajún, Spain

Pyrite from Navajún, La Rioja, Spain

Pyrite specimens from Navajún, Spain.

These pieces are in a marlstone matrix, often with light green nodules of chamosite.

These specimens are often cubic, but can be decagonal, and are sometimes altered cubes too - rounded off, or with curved edges.

Several should be considered thumbnail or micro sized specimens, with very small pyrite crystals - some have much larger crystals.

It is very common for crystals to be glued back into the matrix from this locale. None of these are - they are all natural and unrepaired - in fact, many crystals fell out while they were in transit, being trimmed, etc.