| Also associated with smoky quartz are microcline, fluorite, goethite, and topaz. |
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| These soils have a typical, immature tropical soil mineral assemblage dominated by kaolin, quartz and goethite. |
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| Microcrystals of azurite and goethite and a small number of microcrystals of chalcocite were also recovered. |
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| Like hematite, some goethite is pseudomorphic after a rhombohedral carbonate mineral. |
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| Impressive blades and masses of lustrous micaceous hematite occur in localized quartz veins, and reniform goethite is found in the walls. |
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| Most, if not all, of these mines have likely produced specimen-quality hematite, goethite, and perhaps other minerals. |
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| Tiny crystals of hematite, goethite, chalcopyrite, marcasite, and dolomite are common and make excellent micromounts. |
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| Most specimens are on a typical brown goethite matrix and may have associated calcite, plattnerite, barite, fluorite, and hemimorphite. |
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| Another relatively new discovery is pyrite as attractive, sharp, cubic crystals, to 1 cm on edge, altered to goethite. |
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| Microcrystals of pyrrhotite, goethite, pyrite, galena, and calcite are found on the dumps. |
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| Notable occurrences of this include goethite psedomorphing pyrite, with exsolved gold near the surfaces of the replacement. |
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| It includes goethite on quartz, secondary quartz enclosing already crystallized goethite, and goethite and secondary quartz crystallizing together. |
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| Any or all of these carbonate minerals may have acted as the now-replaced parent to the well-known pseudomorphic, rhombohedral replacements by hematite and goethite. |
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| Some of this quartz exhibits amethyst coloration, and the totally included goethite obviously crystallized at the same time the quartz was forming. |
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| They often have grown around pre-existing acicular goethite crystals in random orientation, clearly demonstrating the quartz to be of a later growth. |
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| The second factor is the small critical fiber length of the goethite fibers in limpet teeth. |
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| Still, depending on the formation of the chitin matrix, this can have varying profound effects on the formation of the goethite crystals. |
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| The most prominent metal by percent composition is iron in the form of goethite. |
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| Schwertmann U, Kampf N Properties of goethite and hematite in kaolinitic soils of southern and central Brazil. |
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| Chlorapatite, carbonate-hydroxyapatite, gypsum, and goethite were recorded in some samples. |
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| Because of this, the main factor influencing goethite crystal growth is the chitin fibers of the matrix. |
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| As a result, goethite nanofibers are able to maintain substantial failure strength despite the presence of defects. |
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| Critical length of the goethite fibers is the reason the structural chitin matrix has extreme support. |
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| Detrital magnetite could have oxidized to hematite and goethite, while detrital ilmenite could transform to leucoxene during early diagenetic stages. |
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| There are records of micrometeorite protoliths of maghemite and goethite. |
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| The goethite crystals are stable and well formed for a biogenic crystal. |
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| This paired with orientation of the fibers leads to effective stress distribution onto the goethite fibers and not onto the weaker chitin matrix in the limpet teeth. |
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| Specifically, goethite crystals nucleate on these chitin fibers and push aside or engulf the chitin fibers as they grow, influencing their resulting orientation. |
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| The hematite and goethite occurrences are interpreted to result from alteration and enrichment of the magnetite-bearing BIF, particularly in areas of complex folding. |
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| Bog ore often combines goethite, magnetite and vugs or stained quartz. |
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| Rock sample 2074 taken from Gossan Ridge contains abundant alunite, tremolite, tourmaline, goethite, and quartz alteration of amphibole bearing-alkali rhyolite. |
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| The goethite, however, has varying different crystal habits. |
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| While deep water limpets have been shown to have the same elemental composition as shallow water limpets, deep water limpets do not show crystalline phases of goethite. |
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| After one to two days, these ions are converted to goethite crystals. |
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| Goethite forms only in the presence of water, whether in liquid, ice or gaseous form. |
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| Goethite and lepidocrocite, FeOOH, are common replacement agents of pyrite and also occur as stains on minerals exposed to weathering. |
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| Goethite as a mineral is a relatively soft iron based material, which increases the chance of physical damage to the structure. |
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| Goethite enriched with gold and silver is found in the 30 m thick oxide cap. |
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| Goethite is known to exhibit a remanent paramagnetic signal due to defects that accounts for these observations. |
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| Goethite crystals form in at the start of the tooth production cycle and remain as a fundamental part of the tooth with intercrystal space filled with amorphous silica. |
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