Pyrite from Ambas Aguas, Spain

Pyrite from Ambas Aguas, Muro de Aguas, La Rioja, Spain

Pyrite specimens from Ambas Aguas, Spain.

These pieces are in a marlstone matrix, sometimes with gypsum and sometimes with cookeite.

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.

We also have some budget stock that isn't photographed and is sold as a random selection.

• Micromounts, on matrix. Mostly cubic, or dodecahedral. Matrix 5-15MM approx, mostly 5-10MM. Pyrite crystals typically 2-3MM.