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Browse Items · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/items/browse%3Ftags=igneous.html9 Apr 2024: Browse Items (7 total). Tags: igneous. Sort by:. Formula Ca5(PO4)3(OH,F,Cl) Structure Non-silicate Crystal System Crystal system: hexagonal (-) Physical Properties Colour in hand specimen: green, white, yellow, blue brown etc.Hardness: 5 Optical -
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. -
Rietveld quantitative analysis and amorphous content quantitative…
https://www.esc.cam.ac.uk/system/files/documents/goethite-quant-analysis-2012-pdf.pdfSample goethite magnetite clinochrys. orthopyroxene gof. YL25m 88.1%3.8% <5% 7.11.4% not included 1.342. ... Acta Cryst. A63, 412-417Bragg, W.H. (1915) The structure of magnetite and the spinels. -
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 -
Halite · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/halite.html9 Apr 2024: Halite cubic crystal structure with large Cl. -. anions (green) and small Na. cations (yellow). This mineral is commonly known as rock salt. Formula. NaCl. Structure. Non-silicate. Crystal System. Crystal system: cubic. Physical Properties. Colour -
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 -
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: -
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 -
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 -
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.
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