Topaz is a silicate mineral containing aluminum and fluorine. It is very hard and forms in igneous rocks as well as hydrothermal ore deposits. It presents as many colors such as white, yellow, pink, blue, and green. This specimen was found in San Luis Potosi, Mexico and was sold by George L. English and Company.
George L. English & Company George L. English and Company was a mineral business founded by George L. English in Philadelphia, Pennsylvania in 1887 with partner Edwin C. Atkinson. In 1890 his business expanded to New York City and in 1905 the entire business and stock was bought by Ward's Natural Science Establishment.