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A crystal consisting of one mineral but having the form of another which it has replaced.
- ‘Close examination of the drift and crosscut revealed two crystal-bearing zones, where two large vugs were discovered that contained superb quartz encrustation pseudomorphs of calcite crystals.’
- ‘In one isolated occurrence, aggregates of small cerussite crystals form pseudomorphs, less than 2 mm across, after an unknown mineral.’
- ‘The idea that tiger's-eye is a pseudomorph - a mineral in which crystals of one material take on the form of another, which it replaces atom by atom - held sway for more than 125 years.’
- ‘Similar malachite masses weighing up to 3 tons as well as malachite pseudomorphs after cuprite crystals to 2 cm have been found in the mine.’
- ‘Amazing and fantastic forms of representatives of the mineral world are displayed in the exhibitions dedicated to crystals, mineral aggregates, and pseudomorphs.’
Replace (another substance) to form a pseudomorph.
- ‘The most common secondary uranium mineral at the mine, it is typically associated with sooty black organic material and may pseudomorph it.’
- ‘Titanite is less conspicuous and often pseudomorphed by carbonate and rutile; allanite more so in euhedral crystals up to I cm in length.’
- ‘Foord reported that bastnasite has been found pseudomorphing allanite.’
- ‘Relict coarse, lath-shaped omphacites are variably preserved, but all are either partially retrogressed to pargasite or have been pseudomorphed by diopside-plagioclase symplectites.’
- ‘Andalusite porphyroblasts that overgrow the S 1 fabric were pseudomorphed by colourless mica.’
Mid 19th century: from pseudo- false + Greek morphē form.
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