Widespread glasses generated by cometary fireballs during the late Pleistocene in the Atacama Desert, Chile: COMMENT

Lasnierite, (Ca,Sr)(Mg,Fe) 2 Al(PO 4 ) 3 , a new phosphate accompanying lazulite from Mt. Ibity, Madagascar: an example of structural characterization from dynamical refinement of precession electron diffraction data on submicrometre sample

Why Are Some Crystals Gem QUALITY? CRYSTAL Growth Considerations On the “gem Factor”

Fayalite oxidation processes in Obsidian Cliffs rhyolite flow, Oregon

Incorporation of Zn in the destabilization products of muscovite at 1175 °C under disequilibrium conditions, and implications for heavy metal sequestration

The Identification of Faceted Gemstones: From the Naked Eye to Laboratory Techniques

Onion morphology and microstructure of polyhedral serpentine

Evolution of product phase assemblages during thermal decomposition of muscovite under strong disequilibrium conditions

Serpentinites in an Alpine convergent setting: Effects of metamorphic grade and deformation on microstructures

MICROSTRUCTURES OF COMMON POLYGONAL SERPENTINES FROM AXIAL HRTEM IMAGING, ELECTRON DIFFRACTION, AND LATTICE-SIMULATION DATA

Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru

The structure of Mn-rich tuperssuatsiaite: A palygorskite-related mineral

Serpentinites from Central Cuba : petrology and HRTEM study

Pseudotachylyte (Frictionite) at the Base of the Arequipa Volcanic Landslide Deposit (Peru): Implications for Emplacement Mechanisms

Crystal structure of kanemite, NaHSi 2 O 5 .3H 2 O, from the Aris Phonolite, Namibia

Magnetite from magnetotactic bacteria; size distributions and twinning

First evidence of synthetic polygonal serpentines

Axial diffraction of curved lattices; geometrical and numerical modeling; application to chrysotile