retrieve the geomaterials that match an given optical signs.
Source:R/mindat_geomaterials.R
geomaterials_opticalsign.Rd
: Queries the geomaterials match an given optical signs.
Arguments
- signs
list of the signs(string or null). sign for uniaxial and biaxial minerals: +;-;+/- .Please refer to the details.
- ...,
Further named parameters.Other optional arguments.