Both the monosubstituted and disubstituted transition states, 2 and 4 respectively, for the ethynyl substitution of fluorine with a lithium counter cation displayed unconventional geometry at the trigonal bipyramidal
The pigment was accidentally discovered when some manganese compounds came out of a 2,000 degree Fahrenheit oven transformed into a beautiful blue, which researchers later determined was due to an unusual "trigonal bipyramidal
coordination" of their molecules that changed when exposed to extreme heat.
Charcot-Leyden crystals (degenerated eosinophils) are present as long, needle-shaped, or bipyramidal
eosinophilic crystals (figure 2).
The newest--and possibly the best--blue pigment in world history was born, due to manganese ions being structured in an unusual "trigonal bipyramidal
coordination" in the presence of extreme heat.
[beta]-quartz is commonly formed in high-temperature silicic magmas.
Ni(II) complexes are known with a six coordinate octahedral configuration, five coordinate square pyramidal or trigonal bipyramidal
structure and four coordinate square planar or tetrahedral configuration.
The monomeric form of the complex has a five-member chelated ring structure with distorted trigonal bipyramidal
However they are of a very high quality which is not so frequent in India and often have more complex morphologies, such as icosahedral and bipyramidal
In thin section, quartz crystals are equant, clear and undeformed, and in one thin section of a lithic lapilli tuff, a quartz crystal is a stubby bipyramidal
prism, the high temperature form.