| The original cordierite crystals were sixling twins that give the pseudomorphs a flower-shaped cross section. |
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| 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. |
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| Copper pseudomorphs after another isometric mineral, apparently cuprite, are known in excellent, though rare, specimens. |
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| In one isolated occurrence, aggregates of small cerussite crystals form pseudomorphs, less than 2 mm across, after an unknown mineral. |
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| At some locations sericite completely pseudomorphs topaz and the feldspars. |
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| They noted that good pseudomorphs of limonite after pyrite, both as cubes and as pyritohedra, are common, especially in bodies of massive pyrite. |
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| Additional weak silicic solutions formed thin encrustations of quartz on the calcite in delicate encrustation pseudomorphs. |
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| These are actually pseudomorphs of sericite after cordierite and are found included in hornfels or slate as a product of contact metamorphism. |
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| Amazing and fantastic forms of representatives of the mineral world are displayed in the exhibitions dedicated to crystals, mineral aggregates, and pseudomorphs. |
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| The serpentinized harzburgite has a gneissic fabric shown by the orientation of the bastite pseudomorphs after orthopyroxene, typical of sub-ophiolitic upper mantle. |
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| Large crystals that appear to be pyrrhotite are usually hexagonal pseudomorphs of pyrite after pyrrhotite. |
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| It pseudomorphs after sérandite and offers some of the most exceptional crystal specimens at Mont Saint-Hilaire in sizes up to 20cm. |
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| It is also frequent as spherical aggregates and druses as large pseudomorphs after other minerals. |
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| It also coats or pseudomorphs some of the secondary minerals. |
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| Some of the cavities contain bits of iron oxides, and relatively sharp octahedra have been found on weathered pseudomorphs of limonite after pyrite. |
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| The Bailey Rock Rhyolite is a porphyritic lava and, like other lavas, is characterized by an absence of angular crystal fragments and pumice pseudomorphs. |
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| The sills contain small pseudomorphs of olivine, plus plagioclase and clinopyroxene phenocrysts. |
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| Berthierine, a member of the kaolinite-serpentine group, is found as pseudomorphs at MSH. It is a pseudomorph after a mineral with a layered structure, possibly some mineral of the mica group. |
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| Pseudomorphs of marcasite, chalcopyrite, pyrite, arsenopyrite, pyrargyrite, magnetite, and quartz after pyrrhotite have been reported. |
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| Pseudomorphs of smithsonite after calcite crystals have been reported from this locality. |
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