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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. -
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. -
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. -
L172 - ultramafic cumulate · Igneous Rocks · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/igneous-rocks/l172.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. -
Chlorite · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/chlorite.html9 Apr 2024: Chlorite crystal structure, CrystalMaker. Formula. (Mg,Fe. 2+. ,Fe. 3+. ,Mn,Al). 12. [(Si,Al). 8. O. 20. ](OH). 16. Structure. Sheet silicate. Crystal System. Crystal system: monoclinic () (-). Physical Properties. Colour in hand specimen: green. -
Fluorite · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/fluorite.html9 Apr 2024: Fluorite crystal hand specimen, purple hue. Fluorite crystal structure (cubic), CrystalMaker. Formula. CaF. 2. Structure. Non-silicate. Crystal System. Crystal system: cubic. Physical Properties. Colour in hand specimen: extremely variable: -
Olivine · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/olivine.html9 Apr 2024: Olivine hand specimen, no cleavage. Olivine crystal structure, CrystalMaker. Formula. (Mg,Fe). 2. [SiO. 4. ]. Structure. Orthosilicate. Crystal System. Crystal system: orthorhombic () (-). Physical Properties. Colour in hand specimen: pale green. -
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 -
Anhydrite · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/anhydrite.html9 Apr 2024: Anhydrite crystal structure, CrystalMaker. Formula. CaSO. 4. Structure. Non-silicate. Crystal System. Crystal system: orthorhombic (). Physical Properties. Colour in hand specimen: white or colourless when pure. Cleavage: two at 90. Hardness: 3-3.5. -
Dolomite · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/dolomite.html9 Apr 2024: Dolomite in hand specimen. Dolomite crystal structure, CrystalMaker. Formula. CaMg(CO. 3. ). 2. Structure. Non-silicate. Crystal System. Crystal system: trigonal (-). Physical Properties. Colour in hand specimen: white, often tinged with yellow or -
Calcite · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/calcite.html9 Apr 2024: Single crystal calcite hand specimen. Small calcite crystals growing from a free surface. Milky single crystal of calcite. Calcite crystal structure, CrystalMaker. Formula. CaCO. 3. Structure. Non-silicate. Crystal System. Crystal system: trigonal (- -
Serpentine · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/serpentine.html9 Apr 2024: Serpentine crystal lattice, with sheet silicate structure (CrystalMaker). Serpentine is a common alteration product of olivine, produced by hydration at low temperatures. Formula. Mg. 3. [Si. 2. O. 5. ](OH). 4. Structure. Sheet silicate. Crystal -
Mica, muscovite · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/muscovite.html9 Apr 2024: Mica, muscovite. Crystals of muscovite with basal cleavage. Crystals of muscovite, colourless. Muscovite crystal structure (a sheet silicate), CrystalMaker. Formula. K. 2. Al. 4. [Si. 6. Al. 2. O. 20. ](OH,F). 4. Structure. Sheet silicate. Crystal -
Tourmaline · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/tourmaline.html9 Apr 2024: Tourmaline crystal structure (trigonal), CrystalMaker. Tourmaline is the only common mineral of which boron is an essential constituent. Its presence in a rock, therefore, indicates that the rock contains significant boron. Formula. -
Amphibole (hornblende) · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/hornblende.html9 Apr 2024: Amphibole (hornblende). Amphibole hand specimen. Amphibole hand specimen. Formula. (Na,K). 0-1. Ca. 2. (Mg,Fe. 2+. ,Fe. 3+. ,Al). 5. Si. 6-7.5. Al. 2-0.5. O. 22. (OH). 2. Structure. Chain silicate. Crystal System. Crystal system: monoclinic () (-). -
Orthopyroxene · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/orthopyroxene.html9 Apr 2024: Orthopyroxene. Orthopyroxene crystal structure, CrystalMaker. Orthopyroxene chemical variability. Enstatite (common in mafic rocks) always has high Mg and low Ca. Formula. (Mg,Fe). 2. Si. 2. O. 6. Structure. Chain silicate. Crystal System. Crystal -
Plagioclase feldspar · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/plagioclase.html9 Apr 2024: Plagioclase feldspar. Plagioclase feldspar hand specimen, polycrystalline with opaque, white colour. Plagioclase feldspar with optical schiller. Plagioclase feldspar crystal structure, CrystalMaker. Formula. Na[AlSi. 3. O. 8. ] – Ca[Al. 2. Si. 2. -
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. -
Alkali Feldspar · Minerals · 1A Collections
https://p1acollections.esc.cam.ac.uk/p1acollections/exhibits/show/minerals/alkali-feldspar.html9 Apr 2024: Alkali Feldspar. Alkali feldspar hand specimen, pink hue. Alkali feldspar hand specimen, milky white. Simply twinned alkali feldspar in granite. Alkali feldspar unit cell, CrystalMaker. Formula. (K,Na)[AlSi. 3. O. 8. ]. Structure. Framework
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