Whewellite

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These are literally like jewels. Whewellite is a very rare low-temperature primary hydrothermal mineral in carbonate-sulfide veins; it also occurs in geodes, or septarian nodules; is associated with coal measures and surrounding rocks with organic material; and occurs in some uranium deposits. It also occurs as microscopic crystals in living plant cells and as calculi or as a sediment in the human urinary tract. This old-time collection of 19, sharp, water-clear, prismatic crystals is from a classic German locale - the Gluckauf Mine, Burgk, Dresden, Saxony, Germany. The whewellite occurs in anthracite coal measures here and many of the crystals are twinned. Ex. Robert Whitmore Collection and accompanied by a Lazard Cahn label dating from 1915-1940.