Danburite is a calcium borosilicate (CaB2Si2O8) that was first discovered in Danbury, Connecticut. Guess how danburite got its name. This mineral has a Mohs' hardness of 7-7.5 and is normally colorless to very light pink in color. It has been found in the USA, Bolivia, CIR, Japan, Germany, Switzerland, and Mexico. The Charcas Mineral District in the state of San Luis Potosi was discovered in 1574 and has been worked ever since for lead, zinc, copper and silver. The metal ore deposits are found in veins along faults in shaly limestone, volcanics, and monzonites. Associated with these ore deposits are gemmy crystals of danburite such as those pictured above. This year at a Phoenix gem and mineral society show I came across this "old collection" specimen of tiny danburite crystals still attached to matrix. Along with the little danburite crystals (a few of which are crystal clear) are little cubes of pyrite scattered over the entire specimen. The detail and three dimensionality of this lovely specimen are lost in the image presented above. A close-up image is provided to better show the beauty of this piece. This specimen is labeled as having come from San Luis Potosi, Mexicon. I always scour the Tucson shows for Mexican danburite. You can find huge and very expensive matrix specimens from this locale, but there are few small specimens available with this aesthetic quality and such a reasonable price. (#M250, $45.00 Sold). BACK