Very fine hemispherical balls, 2.5-3 cm across, of creamy strontianite locally tinged light brown from hydrocarbons with associated calcite. Matrix is blue and light purple fluorite. Classic combination from advance mining ca. 1990 when Ozark-Mahoning company began mining the Minerva #1 again after de-watering the mine. Condition: excellent. Provenance: Jim DuFoe Collection; sold to Charles Noll (Noll #CN4016); donated to Marquette University; brokered by Seaman Museum; sold to Ross Lillie Tucson 2016.