Examples from the Web for monoclinic
Heat is set free when monoclinic sulphur changes into rhombic.An Elementary Study of Chemistry|William McPherson
The monoclinic crystals are prismatic in habit, with deeply striated prism and dome faces.
Sulphur exists in two well-known crystalline forms—rhombic, or octahedral, and monoclinic, or prismatic sulphur.The Phase Rule and Its Applications|Alexander Findlay
The crystals are monoclinic and occur in porphyry almost exclusively.Rimrock Trail|J. Allan Dunn
Occasionally, though but rarely, malachite occurs in small dark-green prismatic crystals of the monoclinic system.