Assertion: calcite | /r/CapableOf | form internal doublet structure
Facets:
value: in some trilobites
type: LOCATION
value: according to optical principles
type: OTHER
Source sentences:
text: Rigid calcite lenses would have been unable to accommodate to a change of focus like the soft lens in a human eye would; in some trilobites, the calcite formed an internal doublet structure, giving superb depth of field and minimal spherical aberration, according to optical principles discovered by French scientist René Descartes and Dutch physicist Christiaan Huygens in the 17th century.