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Two interpenetrant cubic crystals complete in all respects save one contact point at the back of the secondary crystal. A third crystal was the main contact area and is incomplete. Many of the surface features are infilled with native petroleum. Nice outer edge zoning.

Locality: Denton Mine, Harris Creek District, Southern Illinois

Composition: Calcium Fluoride

Dimensions: 4 × 3.5 × 3 cm
SKU: Geo-3372 Categories: , ,
Dimensions: 4 × 3.5 × 3 cm