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Gypsum · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/gypsum.html9 Apr 2024: Gypsum single crystal hand specimen, monoclinic symmetry apparent. Milky, opaque gypsum with twinned crystal habit. Gypsum crystal structure showing monoclinic symmetry, CrystalMaker. Formula. CaSO. 4. 2H. 2. 0. Structure. Non-silicate. Crystal -
Sphene · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/sphene.html9 Apr 2024: Sphene crystal structure, CrystalMaker. Formula. CaTi[SiO. 4. ](O, OH, F). Structure. Orthosilicate. Crystal System. Crystal system: monoclinic (). Physical Properties. Colour in hand specimen: colourless, yellow, green, brown or black. Cleavage: one -
L172 Ultramafic cumulate · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/igneous-rocks/item/14.html9 Apr 2024: Alteration to magnetite and serpentine, particularly along the curving cracks. Cracks across the thin-section, could be due to expansion of the rock as the olivine was altered. -
Galena · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/galena.html9 Apr 2024: Galena crystal structure, with large yellow sulfur and small purple lead symbols. Galena in hand specimen. Formula. PbS. Structure. Non-silicate. Crystal System. Crystal system: cubic. Physical Properties. Colour in hand specimen: lead grey. Streak: -
Zircon · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/zircon.html9 Apr 2024: Zircon crystal structure (tetragonal), CrystalMaker. Zircon is a common accessory mineral of many igneous rocks. Pleochroic haloes are formed by damage to the crystal lattice of enclosing minerals by the radioactive decay of elements such as Th and -
Garnet · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/garnet.html9 Apr 2024: Garnet (euhedral) in hand specimen. Formula. (Mg,Fe,Ca). 3. Al. 2. Si. 3. O. 12. Structure. Orthosilicate. Crystal System. Crystal system: cubic. Physical Properties. Colour in hand specimen: typically red. Cleavage: none. Hardness: 6-7.5. Optical -
Pyrite · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/pyrite.html9 Apr 2024: Pyrite crystals, with metallic lustre. Pyrite crystals within quartz. Pyrite cubis crystal structure, showing octahedral coordination of Fe by S. Formula. FeS. 2. Structure. Non-silicate. Crystal System. Crystal system: cubic. Physical Properties. -
Quartz · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/quartz.html9 Apr 2024: Quartz single crystal, no cleavage, conchoidal fracture. Quartz prisms, vitreous lustre. Quartz prisms (roughly hexagonal habit). Quartz crystal structure (trigonal unit cell), CrystalMaker. Formula. SiO. 2. Structure. Framework silicate. Crystal -
Epidote · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/epidote.html9 Apr 2024: Epidote crystal structure. Formula. Ca. 2. Al. 2. O(Al,Fe. 3+. )OH[Si. 2. O. 7. ][SiO. 4. ]. Structure. Orthosilicate. Crystal System. Crystal system: monoclinic (-). Physical Properties. Colour in hand specimen: green. Cleavage: one, perfect. -
L120 - granodiorite · Igneous Rocks · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/igneous-rocks/l120.html9 Apr 2024: Alteration. Zonation. Accessory minerals:. - Sphene. - Magnetite. - Apatite. Rock History.
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