By Dirk J. Wiersma
Magic of Minerals and Rocks, that includes a hundred thirty five superb colour images, levels from mammoth rock-landscapes recorded in Europe, the USA, Australia, and Iceland down to finely particular photographs of some sq. millimeters. Close-ups of crystals, gemstones, and fossils are alternated with micro-images of the minute textures and styles that emerge from skinny, translucent sections of rocks and minerals. actually, in addition to figuratively Dirk Wiersma, the photographer, 'zooms in' at the subject material, top the reader deeper into quite a few areas of bizarre new kinds and views, now and then summary, at different occasions (pseudo)realistic. usually, impressive similarities are published among topics which are ostensibly of completely diverse natures and dimensions. the quick, accompanying texts are written in a mode that's available and attractive to a normal viewers, whereas additionally supplying the required genuine details.
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After all, by immersing geode slabs in color baths, they can be given the fanciest colors you wish. Which is what accounts for the wondrous blue in this specimen. Actual diameter 70 mm. G Geodino is the term used in South America for small geodes, which often show fine detail, with small and very clear quartz crystals in the hollow core. This one is about the size of a walnut. A CRYSTAL WAlHAll I-l The split and polished surface 61 lIAThis type of geode is called a 'thunderegg'.
Actual size 40 x 50 mm. o Opposite halves of an Australian geode, the size of a small melon, are suggestively portrayed against a marine background, evoking a scene that can often be seen in the seas around that continent. This geode is formed in a void inside a volcanic rock called rhyolite, the same way as described for the first few pictures in this chapter. UI: The forms taken on by chalcedony inside geo- des are wondrous and so are the colors, but... , not always. After all, by immersing geode slabs in color baths, they can be given the fanciest colors you wish.
Globules seen here are formed by radial, crystalline growth in a void inside lava and they are a rarity. Actual size 40 x 60 mm. The hexagonal crystals of aquamarine have a neat, columnar arrangement in this group. Aquamarine is a vari- CALCITE 0 FLUORITE Like a stranded space vehicle, ety of beryl and is often found in pegmatites, complex rock this double-ended crystal of calcite has nested itself on an earli- suites formed at great depth, often the source of ores and semi er formed group of fluorite crystals.