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In geology, macrocrystalline rocks have crystals large enough to easily be identified by sight with the naked eye. Macrocrystalline rocks can be further subdivided into fine-grained, medium-grained, large-grained, and coarse-grained rock, where fine-grained rocks have a grain size of less than 1 mm, medium-grained rocks have a grain size of 1 to 5 mm, large-grained rocks one of 5 to 10 mm, and ...
Macrocrystalline Smoky quartz: Light to dark gray, sometimes with a brownish hue: Translucent to opaque Macrocrystalline Tiger's eye: Fibrous gold, red-brown or bluish colored chalcedony, exhibiting chatoyancy. Opaque Cryptocrystalline Prasiolite: Green: Transparent Macrocrystalline Rutilated quartz: Contains acicular (needle-like) inclusions ...
Along with other gold-heavy quartz pieces, the gold was first believed to be bits of damaged machinery. A number of days later, the materials were examined and found to be full of gold. The “Crown Jewel” was the largest of the pieces, weighing in at 60 lb troy (22.4 kg). [4] The finding of the gold was reported by The National Enquirer. [5]
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Physical gold vs. digital gold: What to know. Aly Yale. Updated November 13, 2024 at 3:36 PM.
Cryptocrystalline is a rock texture made up of such minute crystals that its crystalline nature is only vaguely revealed even microscopically [1] in thin section by transmitted polarized light.