Scanning electron micrograph of Dickite, a clay mineral of the group kaolinite-serpentinite, with three polymorphs, halloysite, kaolinite and nacrite. It is named after Allan Brugh Dick, the Scottish metallurgical chemist who first described it. This mineral is commonly found in hydrothermal vein deposits and as an authigenic mineral (grown after the sediment was deposited) in sedimentary rocks. Its colour varies from blue to grey to white and usually has a clay-like texture. Magnification is 3000x at 12.7cm image size. | |
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