Thomas Geerz

Thomas Geerz

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Thomas Geerz
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Wow.. Tanzanite, one of December's birthstones, is relatively new to the colored stone galaxy. As the most common story of the tanzanite mining boom goes, in 1967 a Masai tribesman stumbled upon a cluster of highly transparent, intense blue crystals weathering out of the earth in Merelani, an area of northern Tanzania. He alerted a local fortune hunter named Manuel d’Souza, who quickly registered four mining claims.

Tanzanite As the most common story of the tanzanite mining boom goes, in 1967 a Masai tribesman stumbled upon a cluster of highly transparent, intense blue crystals weathering out of the earth in Merelani, an area of northern Tanzania.

Calcite with quartz from Huanggang Mine, Inner Mongolia, China.  Photo by Jeffrey A Scovil.

Calcite with quartz from Huanggang Mine, Inner Mongolia, China. The pictured specimen is tall. The quartz at the center of the stacked calcite disks is better exposed in some of the specimens that they have at the show. Photo credit: Jeffrey A.

Multi-colored Tourmaline crystals above a Lepidolite covered base. emerald-green tips that evolve into a bluish-green coloration which then changes over to a lighter green near the bottom. The lower portion of the actually becomes "watermelon" in that the