VivianiteHere is a great old locality specimen of Vivianite from the Siglo XX mine in Bolivia. Subscribers to the Mineralogical Record know that an entire issue was dedicated to this unique and historic locality. This small cabinet size piece features a few beautiful, relatively sharp, gemmy, blue green color, prismatic crystals of Vivianite (some are actually doubly terminated!) associated with botryoidal Wavellite which is coated replaced by Limonite. This

Internally

A highly aesthetic and dramatic Ferberite specimen

there is a deep golden-brown hue that can be seen

Viloco (sometimes called Araca) for many years has stood as one of the top Cassiterite localities in the world

If you are familiar with minerals of Myanmar

This piece features a few attractive "cogwheel"-twinned crystal groups of Bournonite with superb luster sitting atop a matrix of micro Pyrite

as it has an interesting chemistry

Upon close inspection

The specimen is nearly 100% complete

prismatic crystals of Vivianite which are associated with beautifully contrasting golden Childrenite aggregates

Specimen # BOL711B231

Specimen # BOL711B146