Hornblende is a silicate mineral and a variety of amphibole. It is rich in iron and magnesium and is often black, dark brown, or green. This specimen was found in Renfrew County, Ontario, Canada and was donated by Mrs. Fredrick Kuhn.
Formula: Ca2(Mg, Fe, Al)5 (Al, Si)8O22(OH)2
2 1/4 in." h 1 3/4 in." w
Gift Of Mrs. Fredrick Kuhn
Mrs. Fredrick Kuhn