Both have identical major ion chemistry CaCO3 but different structures: calcite is trigonal whilst aragonite is orthorhombic.    From Wordnik.com.  [Thompson: "Remarkably Similar" « Climate Audit] Reference

Here there is rotation of one portion with respect to the other through 180° about the principal (trigonal) axis, which is perpendicular to the plane c (111); or the same result may be obtained by reflection across this plane.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

The horns are trigonal, laterally compressed and knotted on the upper edge.    From Wordnik.com.  [Natural History of the Mammalia of India and Ceylon] Reference

Single site x-ray spectroscopic analysis indicates a trigonal coordination in both sites.    From Wordnik.com.  [Journal of Biological Chemistry current issue] Reference

DITRIHEDRIA, in mineralogy, a genus of fpars with twice three fides, or fiYi planes; being formed of two trigonal pyramids joined bafe to bafe, without any intermediate column.    From Wordnik.com.  [Encyclopædia britannica;] Reference

Moreover, some evidence suggests a cardiomyogenic differentiation capacity of MPCs, revealing the capacity to generate quadri - or trigonal cells positive for α-actinin and troponin I (data not shown).    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference

Horns very large, depressed and sub-trigonal at the base, attached to the highest line of the frontals, inclining upwards and backwards, conical towards the tip and bending upwards; muffle large, square.    From Wordnik.com.  [Natural History of the Mammalia of India and Ceylon] Reference

· new feature: full set of allenic, tetrahedral, square planar, trigonal pyramidal.    From Wordnik.com.  [Softpedia - Windows - All] Reference

Recombinant CypA and CypAAcK represent controls. (c acetyllysine density for the trigonal (a) and orthorhombic structures (.    From Wordnik.com.  [Naturejobs - All Jobs] Reference