Crystalline phases refer to distinct arrangements of atoms in a solid material that exhibit [[Long-range order and periodicity]]. In the XRD analysis of the "golden mica ore" sample, four main crystalline phases were identified: 1. $\text{SiO}_2$ - Crystal structure: Triclinic, [[Space Group]] 1 - Concentration: 18.7% (±5%) - This is likely a form of quartz or another silica polymorph. 2. Biotite $\text{K}(\text{Mg},\text{Fe})_3\text{AlSi}_3\text{O}_{10}(\text{F},\text{OH})_2$ - Crystal structure: Monoclinic, Space Group 12 - Concentration: 5.3% (±5%) - Biotite is a common phyllosilicate mineral in the mica group. 3. $(\text{Fe}_4\text{Si})_{0.4}$ - Crystal structure: Cubic, Space Group 229 - Concentration: 75% (±5%, likely overestimated) - This is an intermetallic compound of iron and silicon. 4. $(\text{K}_{1.78}\text{Na}_{0.14}\text{Ba}_{0.08})(\text{Mg}_{2.21}\text{Fe}_{1.65}\text{Al}_{1.86}\text{Ti}_{0.28})(\text{Al}_{2.64}\text{Si}_{5.36}\text{O}_{20})\text{O}_{2.7}(\text{OH})_{1.3}$ - Crystal structure: Monoclinic, Space Group 12 - Concentration: 1% (±5%) - This is likely a complex clay mineral or another phyllosilicate. Each of these phases has a unique crystal structure, which produces a characteristic diffraction pattern when subjected to X-rays. The XRD technique identifies these phases by matching the observed diffraction patterns to known patterns from crystallographic databases. The presence and relative amounts of these crystalline phases provide information about the mineral composition of the sample. However, it's important to note that this analysis focuses only on crystalline materials and may not account for any amorphous (non-crystalline) components that might be present in the sample. The report also mentions that the proportions of these phases, particularly the iron silicon, may be skewed due to differences in X-ray absorptivity between the phases. This means that while we can be confident about the presence of these phases, their exact proportions should be interpreted cautiously. <hr/> <!-- Your main content goes here --> <div class="footer"> Carbonatik © 2024 </div>