Dims: 4.6" x 4.6" x 3.3" (11.7 x 11.7 x 8.4 cm)
Wt: 1 lb., 12.0 oz. (794 g)
Clay Center, Ohio, U.S.A.
This specimen is NOT what comes to mind when somebody says "Celestite!" It is, however, a unique specimen from an almost-unknown locality in our home state of Ohio. It consists of a large cluster of radiating orthorombic blades of colorless and somewhat transparent Celestite that grow out of a small amount of a brown calcareous shale host rock. The crystals generally do not exceed 1.0" (2.5 cm), though some may have before the specimen was mined. Many of the crystals are broken, as the blades are exposed and very thin and delicate. Most of the smaller blades are intact, however, and show very sharp, chevon-shaped termination edges. Their luster tends to be pearly-to-waxy and though they are transparent, clarity varies according to inclusions and internal fractures from crystal to crystal. Accompanying the Celestite are at least 15 chubby, yellow scalenohedral calcite crystals, all of which show end-to-end twinning! All of these also have a pearly-to-waxy luster and are generally translucent, though showing transparence in isolated areas. Their form is generally good, though some of the crystals are so intergrown with the Celestite blades that their form is rather difficult to define. This material was part of a "Silurian Reef" formation that was found in a pocket 450' (approx. 40 m) deep. Part of this unexpected find consisted of a variety of invertebrate fossils which were replaced by the calcite and Celestite in such a way as to preserve incredible definition and detail.