It crystallizes in the orthorhombic system and is isomorphous with stibnite (Sb2S3), which it closely resembles in appearance.
The alkaline perchlorates are isomorphous with the permanganates.
isomorphous: having the same form, appearance or construction.
It is not isomorphous with the orthorhombic barium and strontium sulphates, as might be expected from the chemical formulae.
The majority of the chromates are yellow in colour, and many of them are isomorphous with the corresponding sulphates.
As far as the genus is concerned it was found that the hemoglobin crystals of any genus are isomorphous.
Haematite crystallizes in the rhombohedral system, and is isomorphous with corundum (Al2O3).
It crystallizes in dark purple-red prisms, isomorphous with potassium perchlorate.
It is rhombohedral in crystallization and isomorphous with calcite and chalybite.
Cerussite crystallizes in the orthorhombic system and is isomorphous with aragonite.