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search results for `probably magnetite` |d>25Jun2023<27Jun2024
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L141 Gabbro · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/igneous-rocks/item/10.html9 Apr 2024: The olivine has decomposed to magnetite and serpentine. Relict olivine grains display characteristic curving cracks andClinopyroxene (augite). - ... Some simple twinning. Accessory minerals. - Opaque, interstitial, probably magnetite. Rock History. -
L141 - gabbro · Igneous Rocks · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/igneous-rocks/l141.html9 Apr 2024: The olivine has decomposed to magnetite and serpentine. Relict olivine grains display characteristic curving cracks andClinopyroxene (augite). - ... Some simple twinning. Accessory minerals. - Opaque, interstitial, probably magnetite. Rock History. -
L162 Basalt, porphyritic · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/igneous-rocks/item/12.html9 Apr 2024: Some areof magnetite, clinopyroxene and other minerals. Extensive alteration along abundant cracks. ... Groundmass. - Fine-grained. Plagioclase feldspar needles, clinopyroxene, some olivine (mostly altered), and opaques, probably magnetite. -
L102 Hornblende biotite granite · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/igneous-rocks/item/4.html9 Apr 2024: Strongly pleochroic in reddish brown and pale straw. Often associated with small grains of an opaque accessory mineral, probably magnetite. ... Presence of hornblende and biotite indicate that this is a wet granite, probably from a subduction zone. -
L162 - porphyritic basalt · Igneous Rocks · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/igneous-rocks/l162.html9 Apr 2024: Some areof magnetite, clinopyroxene and other minerals. Extensive alteration along abundant cracks. ... Groundmass. - Fine-grained. Plagioclase feldspar needles, clinopyroxene, some olivine (mostly altered), and opaques, probably magnetite. -
L102 - hornblende biotite granite · Igneous Rocks · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/igneous-rocks/l102.html9 Apr 2024: Strongly pleochroic in reddish brown and pale straw. Often associated with small grains of an opaque accessory mineral, probably magnetite. ... Presence of hornblende and biotite indicate that this is a wet granite, probably from a subduction zone.
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