In this paper, the applicability of spark‐source mass spectrographic analysis and SEM investigations for is demonstrated. The influence of the chemical history of the material on the spectrum of the impurities has been investigated by comparing materials synthesized in three different ways. Static sublimation was used to grow single crystals, which had an appreciable average linear growth rate (10−6 cm/sec) and relatively low etch pit density (103/cm2 or less). Synthesis from “suprapur” elements after additional purification of iodine gave the most pure crystals, which still contained 1700 ppm at. of impurities. The spark source mass spectrographic analysis on reveals abundant distributions which are conspicuously characteristic of the crystal properties (valence, structure, composition, etc.) for elemental impurities, and crystal structure characteristic for the hydrocarbon fragments. Overall abundances for sublimated vary according to the material source. Morphological investigation of uncoated crystal surfaces (as grown, etched, or cleaved) was possible by low temperature SEM investigation. They showed that most etch pits are flat bottomed at up to . Emergence points of dislocations are not visible; dislocations appear only in the form of a few pyramidal etch pits.