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Blue John
Just an experimental doodle. A semi-abstract representation of a pile of quarried limestone rock containing crystals of Blue John, a form of fluorite found very locally in caves in Derbyshire, England. This may not be entirely accurate as it is stretching my memory back almost 50 years! The crystals are generally a darker, inky blue, but this did not suit my compositional intentions and anyway paler morphs do frequently occur, including some with a violet shade as depicted here. Mostly turned locally into small trinkets for the tourist trade, or sold uncut as geological specimens, although in Victorian times it was used for carving much larger artefacts. All ZBrush and all one tool - a sphere grossly deformed using one of PinheadPaul's alpha height-field maps, then with the poly-count lowered to give some crystalline edges in the more heavily distorted regions. This was then textured using Texture Master and repeated in various sizes and orientations on the canvas.