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and colloid
Botryoidal and radial lamellar calcite overgrowths epitaxially develop on the upper section of quartz surfaces
Amazonite from Pikes Peak Batholith
Corundum (Ruby/Sapphire) from Madagascar
with its warm-toned microcrystalline texture
Rainbow‑Tarnished Cubic Fluorite 5 miner and colloidRainbowTarnished Cubic Fluorite from Weishan Yi and Hui Autonomous County, Dali City, Yunnan Province, China This cubicform fluorite specimen features neatlyshaped cubic crystals forming dense aggregates. A thin ironoxide film across crystal surfaces creates iridescent tarnish through lightwave interference under ambient light. Backlight illumination reveals translucent purplehued interiors, with welldefined zoning textures inside individual crystals.
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