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9 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

9 Apr 2024: Bottryoidal hematite crystal. Hematite crystal strucutre, CrystalMaker. Formula. Fe. 2. O. 3. Structure. Non-silicate. Crystal System. Crystal system: trigonal (-). Physical Properties. Colour in hand specimen: black, steel-grey and bright to dull

9 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 () (-).

9 Apr 2024: Magnetite. Title. Magnetite. Subject. Magnetite is the most abundant oxide in igneous rock. ... Silver-black. Metallic lustre. No cleavage. Rock Specimens. Mineral Name. magnetite. iron oxide.

9 Apr 2024: Relief: high. Isotropic. Mineral Specimens. M501 Magnetite. Brazil. Crystals showing the characteristic octahedral form. ... Silver-black. Metallic lustre. No cleavage. Rock Specimens. Mineral Name. magnetite. iron oxide.

9 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

9 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.

9 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

9 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.

9 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.