 It was apparently free from alteration, had specific gravity of 4.28 (taken on a very pure fragment), had a bright green chatoyancy at certain angles, and was like glass in its broad obsidian-like conchoidal fracture.Masses of coarsely crystallized fluorite up to weight were not rare, and some of these had very large faces of the cube and rhombic dodecahedron.Its color varied from dark green to puce and purple, and colorless transparent rough crystals having remarkably perfect cleavage were sometimes observed.