The Rock Hounds

The Tanjeloff family has prospecting, mineralogy, and entrepreneurialism in their blood. Grandfather Julio emigrated from Argentina around 1960, fleeing the Perón regime, but not before investing in gemstones and minerals, including a rhodochrosite mine. Once in the States, the Tanjeloff clan—including Julio, son Edgar, and grandsons Dennis and Marc—traveled the world in the hunt for new gem finds. When stateside, the family ran the retail and wholesale shop that Julio opened, the Astro Gallery of Gems in New York (now at 34th Street and Madison Avenue) to sell what they unearthed. The Tanjeloff family has enjoyed success. Julio was instrumental in exposing American consumers to unusual stones and specimens, including a gem-quality blue zoisite in the late 1960s. He wanted to market it as “tanjeloffite,” according to the archives of The Mineralogical Record, but a

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