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We review physical and chemical constraints on the mechanisms of melt extraction from the
mantle beneath mid–ocean ridges. Compositional constraints from MORB and abyssal …

Crystals of a variety of substances including elements, minerals, simple salts, organic
molecular crystals, and high polymers forgo long‐range translational order by twisting and …

9-Anthracenecarboxylic acid, a molecule that undergoes a reversible [4+ 4]
photodimerization, is prepared in the form of oriented crystalline microribbons. When …

Agate/chalcedony samples of different origin were investigated by performing Raman, X-ray
diffraction (using Rietveld refinement), and cathodoluminescence measurements. These …

Although terra rossa has long been thought to form by residual dissolution of limestone
and/or by accumulation of detrital mud, ash, or dust on preexisting karst limestones, we …

Crystals grow in the mind's eye by the addition of small units to a monolith each part of which
is in fixed translational relation to every other part. Here, it is shown that growth can induce …

One of the most impressive manifestations of spontaneous pattern generation in natural
materials is iris agate, which contains submicrometer concentric striations that may cycle …

In the Ametista do Sul area, Rio Grande do Sul, Brazil, amethyst-bearing geodes are hosted
by a~ 40-to 50-m-thick subhorizontal high-Ti basaltic lava flow of the Lower Cretaceous …

Complex intracrystalline zoning patterns in hydrothermal garnet and vesuvianite and
magmatic plagioclase were analyzed by statistical methods to test for fractal behavior. The …