Silicate dust particles are part of many astronomical objects such as comets and circumstellar discs. In the spectrum, silicates exhibit a number of characteristic emission features. In this paper, we studied the contribution of quartz (SiO₂) particles to these features. Using the Mie theory, calculations were made of the intensity of light scattered by such particles. Two spectral features were found in the spectrum—near 9 μm and near 20.5 μm. The main properties of these features are investigated. It is established, that the 9 μm feature is much narrower than the 20.5 μm; with an increase in the size of the scattering particle from very small values the position of spectral features (both 9 μm and 20.5 μm) shifts toward longer wavelengths; the 9 μm feature cannot be clearly seen with particle sizes greater than 18 μm, while the 20.5 μm feature is apparent even at particle radius 60 μm.

硅酸盐尘埃颗粒是许多天体的一部分，例如彗星和星盘。在光谱中，硅酸盐表现出许多特征发射特征。在本文中，我们研究了石英 (SiO ₂ ) 颗粒对这些特征的贡献。使用 Mie 理论，计算了由这些粒子散射的光的强度。在光谱中发现了两个光谱特征——接近 9  μ m 和接近 20.5  μ m。研究了这些特征的主要性质。确定 9  μ m 的特征比 20.5  μ m 窄得多；随着散射粒子尺寸从非常小的值增加，光谱特征的位置（均为 9  μm 和 20.5  μ m) 向更长的波长移动；当粒径大于 18 μm时，无法清楚地看到 9  μm的特征，而即使在粒子半径 60  μm时，20.5  μm的特征也很明显。