Fluorite - Gemmy Phantom-Zoned Purple Cube on Matrix, Yaogangxian Mine, China

A single gem Fluorite cube perched on matrix from the Yaogangxian Mine in Hunan, China - a locality that has produced some of the finest Fluorite of the modern era, and one whose best purple material is now considerably harder to source than its reputation might suggest. What distinguishes this piece is not size but clarity: the crystal is glassy enough to read straight through, and its internal colour architecture is fully legible from the front.\n\nThe habit is the classic cube, sharply formed, with crisp edges and flat faces that meet at clean right angles. It sits proud of the matrix and dominates the specimen entirely, with the surrounding crust of micaceous and iron-stained material providing a dark, textured collar that pushes the Fluorite forward. The crystal is set at a slight angle, so the piece reads three-dimensionally rather than as a flat plate.\n\nColour is the heart of it. In ordinary reflected light the cube presents a soft lilac to lavender, but the interest lies in the zoning: a distinct deeper violet phantom traces a square outline within the crystal, marking an earlier growth stage, with paler, near-colourless and faintly straw-tinted regions between. Where light passes through the thinner edges the body colour lightens to an almost water-clear pale amethystine tone, while the corners and the zone boundaries intensify to a saturated grape. Backlit, the phantom structure becomes the dominant feature; frontlit, the surface takes over.\n\nThe lustre is the bright, slightly oily vitreous finish that the best Yaogangxian Fluorite shows, and the faces are reflective enough to throw clean highlights as the piece is rotated. Turning it under a directional lamp alternates between mirror-like surface flash and deep internal glow \u2014 the behaviour collectors actually buy this material for.\n\nThe matrix is a knobbly aggregate of micaceous plates and darker iron-stained crust, modest in itself but valuable here: its matte, earthy texture is the perfect foil for a transparent crystal, absorbing light where the Fluorite transmits it.\n\nCondition is reported as free of damage or contacts on the main crystal. For cubic Fluorite this matters more than for almost any other habit \u2014 the perfect octahedral cleavage means that corners and edges chip readily, and a single bruised corner on a transparent cube is immediately obvious and difficult to disguise. Intact edges on a crystal this gemmy are the difference between a good specimen and a merely acceptable one.\n\nA small miniature, and one that carries real presence for its format. Under directional light it reads less as a mineral fragment than as a small violet window.