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9 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

9 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.

9 Apr 2024: Strongly pleochroic in reddish brown and pale straw. Often associated with small grains of an opaque accessory mineral, probably magnetite.

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: 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: Mica, biotite. hand specimen of biotite mica. Crystals of bioitie mica with perfect basal cleavage. Biotite sheet silicate crystal structure, CrystalMaker. Formula. K. 2. (Mg,Fe. 2+. ). 6-4. (Fe. 3+. ,Al,Ti). 0-2. [Si. 6-5. Al. 2-3. O. 20. ](OH,F).

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: 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

9 Apr 2024: Clinopyroxene (augite). Phase diagram deomstrating the chemical compositional range for clinopyroxenes. Formula. (Ca,Mg,Fe. 2+. ,Fe. 3+. ,Ti,Al). 2. [(Si,Al). 2. O. 6. ]. Structure. Chain silicate. Crystal System. Crystal system: monoclinic ().

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

3 Nov 2023: ii) Calculate the saturation magnetisation of magnetite whose cubic cell has latticeparameter a = 8.39 Å. ... 1.74 106 Am1. (ii) Magnetite is a ferrimagnetic material whose magnetisation is due to the Fe2+ ions inoctahedral sites.

20 Oct 2023: ii) Calculate the saturation magnetisation of magnetite whose cubic cell has latticeparameter a = 8.39 Å.

8 Sep 2023: Thomas-Keprta's discovery of magnetite and carbonate globules in ALH84001. [26] Through the formation. ... Gibson, E.K., McKay, M.F. and Romanek, C.S. (2001). Truncated hexa-octahedral magnetite crystals in.

9 Apr 2024: Minerals. Rocks comprise minerals. In order to understand the paragenesis of a rock, be it igneous, sedimentary or metamorphic, we must identify its constituent minerals. The aim of this collection is to detail the structural, physical and optical

9 Apr 2024: Browse Items (264 total). Page. of 27. Sort by:. Compare with phenocryst. Formula Fe3O4 Structure Non-silicate Crystal System Crystal system: cubic Physical Properties Colour in hand specimen: blackStreak: blackCleavage: noneHardness: 7.5-8 Optical

9 Apr 2024: Browse Items (264 total). Page. of 27. Sort by:. Formula (K,Na)[AlSi3O8] Structure Framework silicate Crystal System Crystal system: monoclinic (-) or triclinic () (-) Physical Properties Colour in hand specimen: white or pink Cleavage: two at 90

9 Apr 2024: Browse Items (264 total). Page. of 27. Sort by:. Formula Fe3O4 Structure Non-silicate Crystal System Crystal system: cubic Physical Properties Colour in hand specimen: blackStreak: blackCleavage: noneHardness: 7.5-8 Optical Properties Colour in

9 Apr 2024: Browse Items (7 total). Tags: igneous. Sort by:. Formula (Na,K)0-1Ca2(Mg,Fe2+,Fe3+,Al)5Si6-7.5Al2-0.5O22(OH)2 Structure Chain silicate Crystal System Crystal system: monoclinic () (-) Physical Properties Colour in hand specimen: black Cleavage:

9 Apr 2024: Browse Items (7 total). Tags: igneous. Sort by:. Formula (Na,K)0-1Ca2(Mg,Fe2+,Fe3+,Al)5Si6-7.5Al2-0.5O22(OH)2 Structure Chain silicate Crystal System Crystal system: monoclinic () (-) Physical Properties Colour in hand specimen: black Cleavage:

9 Apr 2024: Browse Items (7 total). Tags: igneous. Sort by:. Formula SiO2 Structure Framework silicate Crystal System Crystal system: trigonal () Physical Properties Colour in hand specimen: colourless Lustre: vitreous Pleochroism: none Cleavage:

14 Aug 2023: ii U.S. Department of Energy Office of Science Genomics:GTL Program, July 2005. DOE/SC-0090. August 2005. Prepared for the U.S. Department of Energy Office of Science Office of Biological and Environmental Research Office of Advanced Scientific

14 Aug 2023: Copyright National Academy of Sciences. All rights reserved. Industrialization of Biology: A Roadmap to Accelerate the Advanced Manufacturing of Chemicals. Committee on Industrialization of Biology:A Roadmap to Accelerate the Advanced Manufacturing