In the latter part of the 1960s, Minerva Oil Company had orders for zinc-sulfide that exceeded their capacity. As such, they brokered a deal with Ozark-Mahoning Company to mine pillars rich in sulfides from the Deardorff Mine. In this period a number a very fine sphalerite specimens were produced. This piece is from these finds. The sphalerite is typical of the era with high luster and sharp black faces in combination with calcite in this case. Very good condition with only minor edge rubs on the sphalerite. The calcite is damaged but since they only form the matrix is unimportant. Mined c. June 8, 1968. Dr. Perry & Anne Bynum Collection. Bynum notes "Dutton- 6-8-68. Rosaclare (Rosiclare) large calcite xyl cluster"; interpreted as specimen acquired from an employee named with surname Dutton (a very common name in Hardin County) on June 8,1968.